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FTP - Functional Threshold Power....how big is yours!!

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  • Registered Users Posts: 5,468 ✭✭✭sconhome


    User|Starting FTP|Current FTP|Watts/kg|Target FTP|Target Watts/kg|Test|Unit
    Jackyback|298watts|278watts|4.08|320watts|5.00|T5+T20*0.95|Power2Max PM
    NWM2|285watts|327watts|3.9|310watts|3.7|40k TT|Powertap SL+
    pgibbo|232watts|279watts|3.9|300watts|4.35|T5+T20*0.95|Power2Max PM
    Fazz|255 watts|287 watts|4.31|300 watts|4.4|T5+T20*0.95|Lemond/Quarq
    Nerraw|216 watts|216 watts|3.33|280 watts|4.3|T5+T20*0.95|Tacx Flow
    shotgunmcos|318 watts|325 watts|4.23|330watts|4.4|T5+T20*0.95|Tacx Flow
    RedB|230 watts|230 watts|2.55|290 watts|3.5|T5+T20*0.95|Tacx Flow
    BennyMul| 253 watts |231 watts |3.3|270watts|4|T5+T20*0.95|Powertap SL2+
    Bobblehead_jr|345 watts|345 watts|4.9|390 watts|5.6|T5+T20*0.95| iBike iPro
    Macanri|237 watts|237 watts|3.22|?280watts|4.0|T5+T20*0.95|Tacx Flow T2200
    Bambaata|322 watts|338 watts|4.29|345?watts|4.54|T5+T20*0.95|Power2Max PM
    dx22|239 watts|275 watts|3.48|300watts|4.0|T5+T20*0.95|Tacx Flow
    d4r3n|189 watts|210 watts|3.68|240 watts|4.0|T5+T20*0.95|Powertap
    tunney|270 watts|270 watts|3.55|350 watts|5.14|T5+T20*.95|SRM
    couerdelion|252 watts|280 watts|2.69|315 watts|3.50|T5+T20*.95|Cycleops Magneto + Trainer Road
    bryangiggsy|221 watts|253 watts|3.24|290 watts|3.84|T5+T20*.95|SRM
    Briando|233 watts|233 watts|2.98|280 watts|3.58|T5+T20*.95|Power2Max
    Amphkingwest|185 watts|203.3 watts|2.36|300 watts|3.79|T5+T20*.95|Polar / LOOK
    duffyshuffle|272 watts|272 watts|2.81|325 watts|3.61|T5+T20*.95|PowerTap
    slatanic|200 watts|200 watts|| watts||T5+T20*.95|P2M


  • Registered Users Posts: 5,468 ✭✭✭sconhome


    slatanic wrote: »
    Hi All,

    How do I go about adding a line to the table in a reply to post a FTP result?

    For what its worth......... I did this test about 3 weeks ago after following this thread using the methods advised. My night nearly ended after the 5 min blow-out, I was absolutly shattered (253 watts avg) & didnt expect I would be able to do the 20min run. First 10 minutes of 20 were horriffic but it settled down to a hard grind. At the 17 minute mark I was seeing dead people. FTP ended up @ 211x 0.95 = 200 watts
    These measurements are from the P2M. The Tacx Genius (Calibrated before each run etc) came out with a figure about 35ish watts higher (From memory) Any time i hear women banging on about the pain of childbirth, I know theve never done a FTP test.
    Thanks for this thread, Shane.

    All sorted. Just fill in the blanks yourself. When quoting the post you need to remove the bit: quote..... up to table and then from /table to .../quote at the end to leave the table in the post. You also need to take the [ brakcets ] out too.

    I made the mistake before of quoting the table which mucks it up for everyone. Any doubts just post the info and someone will put it in the table for you.


  • Registered Users Posts: 12,583 ✭✭✭✭tunney


    User|Starting FTP|Current FTP|Watts/kg|Target FTP|Target Watts/kg|Test|Unit
    Jackyback|298watts|278watts|4.08|320watts|5.00|T5+T20*0.95|Power2Max PM
    NWM2|285watts|327watts|3.9|310watts|3.7|40k TT|Powertap SL+
    pgibbo|232watts|279watts|3.9|300watts|4.35|T5+T20*0.95|Power2Max PM
    Fazz|255 watts|287 watts|4.31|300 watts|4.4|T5+T20*0.95|Lemond/Quarq
    Nerraw|216 watts|216 watts|3.33|280 watts|4.3|T5+T20*0.95|Tacx Flow
    shotgunmcos|318 watts|325 watts|4.23|330watts|4.4|T5+T20*0.95|Tacx Flow
    RedB|230 watts|230 watts|2.55|290 watts|3.5|T5+T20*0.95|Tacx Flow
    BennyMul| 253 watts |231 watts |3.3|270watts|4|T5+T20*0.95|Powertap SL2+
    Bobblehead_jr|345 watts|345 watts|4.9|390 watts|5.6|T5+T20*0.95| iBike iPro
    Macanri|237 watts|237 watts|3.22|?280watts|4.0|T5+T20*0.95|Tacx Flow T2200
    Bambaata|322 watts|338 watts|4.29|345?watts|4.54|T5+T20*0.95|Power2Max PM
    dx22|239 watts|275 watts|3.48|300watts|4.0|T5+T20*0.95|Tacx Flow
    d4r3n|189 watts|210 watts|3.68|240 watts|4.0|T5+T20*0.95|Powertap
    couerdelion|252 watts|280 watts|2.69|315 watts|3.50|T5+T20*.95|Cycleops Magneto + Trainer Road
    bryangiggsy|221 watts|253 watts|3.24|290 watts|3.84|T5+T20*.95|SRM
    Briando|233 watts|233 watts|2.98|280 watts|3.58|T5+T20*.95|Power2Max
    Amphkingwest|185 watts|203.3 watts|2.36|300 watts|3.79|T5+T20*.95|Polar / LOOK
    duffyshuffle|272 watts|272 watts|2.81|325 watts|3.61|T5+T20*.95|PowerTap
    slatanic|200 watts|200 watts|3.07| 227watts|3.5|T5+T20*.95|P2M


  • Registered Users Posts: 52 ✭✭slatanic


    Thanks, amphkingwest & Tunney, I was making a right hash of that.


  • Registered Users Posts: 5 Tranche


    User|Starting FTP|Current FTP|Watts/kg|Target FTP|Target Watts/kg|Test|Unit
    Jackyback|298watts|278watts|4.08|320watts|5.00|T5+T20*0.95|Power2Max PM
    NWM2|285watts|327watts|3.9|310watts|3.7|40k TT|Powertap SL+
    pgibbo|232watts|279watts|3.9|300watts|4.35|T5+T20*0.95|Power2Max PM
    Fazz|255 watts|287 watts|4.31|300 watts|4.4|T5+T20*0.95|Lemond/Quarq
    Nerraw|216 watts|216 watts|3.33|280 watts|4.3|T5+T20*0.95|Tacx Flow
    shotgunmcos|318 watts|325 watts|4.23|330watts|4.4|T5+T20*0.95|Tacx Flow
    RedB|230 watts|230 watts|2.55|290 watts|3.5|T5+T20*0.95|Tacx Flow
    BennyMul| 253 watts |231 watts |3.3|270watts|4|T5+T20*0.95|Powertap SL2+
    Bobblehead_jr|345 watts|345 watts|4.9|390 watts|5.6|T5+T20*0.95| iBike iPro
    Macanri|237 watts|237 watts|3.22|?280watts|4.0|T5+T20*0.95|Tacx Flow T2200
    Bambaata|322 watts|338 watts|4.29|345?watts|4.54|T5+T20*0.95|Power2Max PM
    dx22|239 watts|275 watts|3.48|300watts|4.0|T5+T20*0.95|Tacx Flow
    d4r3n|189 watts|210 watts|3.68|240 watts|4.0|T5+T20*0.95|Powertap
    couerdelion|252 watts|280 watts|2.69|315 watts|3.50|T5+T20*.95|Cycleops Magneto + Trainer Road
    bryangiggsy|221 watts|253 watts|3.24|290 watts|3.84|T5+T20*.95|SRM
    Briando|233 watts|233 watts|2.98|280 watts|3.58|T5+T20*.95|Power2Max
    Amphkingwest|185 watts|203.3 watts|2.36|300 watts|3.79|T5+T20*.95|Polar / LOOK
    duffyshuffle|272 watts|272 watts|2.81|325 watts|3.61|T5+T20*.95|PowerTap
    slatanic|200 watts|200 watts|3.07| 227watts|3.5|T5+T20*.95|P2M
    Tranche|211 watts|211 watts|3.11| 265watts|3.9|T5+T20*.95|P2M


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  • Registered Users Posts: 2,910 ✭✭✭couerdelion


    User|Starting FTP|Current FTP|Watts/kg|Target FTP|Target Watts/kg|Test|Unit
    Jackyback|298watts|278watts|4.08|320watts|5.00|T5+T20*0.95|Power2Max PM
    NWM2|285watts|327watts|3.9|310watts|3.7|40k TT|Powertap SL+
    pgibbo|232watts|279watts|3.9|300watts|4.35|T5+T20*0.95|Power2Max PM
    Fazz|255 watts|287 watts|4.31|300 watts|4.4|T5+T20*0.95|Lemond/Quarq
    Nerraw|216 watts|216 watts|3.33|280 watts|4.3|T5+T20*0.95|Tacx Flow
    shotgunmcos|318 watts|325 watts|4.23|330watts|4.4|T5+T20*0.95|Tacx Flow
    RedB|230 watts|230 watts|2.55|290 watts|3.5|T5+T20*0.95|Tacx Flow
    BennyMul| 253 watts |231 watts |3.3|270watts|4|T5+T20*0.95|Powertap SL2+
    Bobblehead_jr|345 watts|345 watts|4.9|390 watts|5.6|T5+T20*0.95| iBike iPro
    Macanri|237 watts|237 watts|3.22|?280watts|4.0|T5+T20*0.95|Tacx Flow T2200
    Bambaata|322 watts|338 watts|4.29|345?watts|4.54|T5+T20*0.95|Power2Max PM
    dx22|239 watts|275 watts|3.48|300watts|4.0|T5+T20*0.95|Tacx Flow
    d4r3n|189 watts|210 watts|3.68|240 watts|4.0|T5+T20*0.95|Powertap
    couerdelion|252 watts|299 watts|2.85|315 watts|3.50|T5+T20*.95|Cycleops Magneto + Trainer Road
    bryangiggsy|221 watts|253 watts|3.24|290 watts|3.84|T5+T20*.95|SRM
    Briando|233 watts|233 watts|2.98|280 watts|3.58|T5+T20*.95|Power2Max
    Amphkingwest|185 watts|203.3 watts|2.36|300 watts|3.79|T5+T20*.95|Polar / LOOK
    duffyshuffle|272 watts|272 watts|2.81|325 watts|3.61|T5+T20*.95|PowerTap
    slatanic|200 watts|200 watts|3.07| 227watts|3.5|T5+T20*.95|P2M
    Tranche|211 watts|211 watts|3.11| 265watts|3.9|T5+T20*.95|P2M



    Weight this morning: 105 kg
    5min: AP 350 NP 346 HR 148
    20min: AP 316 NP 315 HR 151

    So new FTP of 299 (315*.95). So close to the 300!
    Felt sick afterwards and had to go for a sit down. HR hit highest bpm since I started measuring (excluding erroneous readings).


  • Registered Users Posts: 1,121 ✭✭✭Fazz


    User|Starting FTP|Current FTP|Watts/kg|Target FTP|Target Watts/kg|Test|Unit
    Jackyback|298watts|278watts|4.08|320watts|5.00|T5+T20*0.95|Power2Max PM
    NWM2|285watts|327watts|3.9|310watts|3.7|40k TT|Powertap SL+
    pgibbo|232watts|279watts|3.9|300watts|4.35|T5+T20*0.95|Power2Max PM
    Fazz|255 watts|300 watts|4.51|315 watts|4.75|T5+T20*0.95|Lemond/Quarq
    Nerraw|216 watts|216 watts|3.33|280 watts|4.3|T5+T20*0.95|Tacx Flow
    shotgunmcos|318 watts|325 watts|4.23|330watts|4.4|T5+T20*0.95|Tacx Flow
    RedB|230 watts|230 watts|2.55|290 watts|3.5|T5+T20*0.95|Tacx Flow
    BennyMul| 253 watts |231 watts |3.3|270watts|4|T5+T20*0.95|Powertap SL2+
    Bobblehead_jr|345 watts|345 watts|4.9|390 watts|5.6|T5+T20*0.95| iBike iPro
    Macanri|237 watts|237 watts|3.22|?280watts|4.0|T5+T20*0.95|Tacx Flow T2200
    Bambaata|322 watts|338 watts|4.29|345?watts|4.54|T5+T20*0.95|Power2Max PM
    dx22|239 watts|275 watts|3.48|300watts|4.0|T5+T20*0.95|Tacx Flow
    d4r3n|189 watts|210 watts|3.68|240 watts|4.0|T5+T20*0.95|Powertap
    couerdelion|252 watts|299 watts|2.85|315 watts|3.50|T5+T20*.95|Cycleops Magneto + Trainer Road
    bryangiggsy|221 watts|253 watts|3.24|290 watts|3.84|T5+T20*.95|SRM
    Briando|233 watts|233 watts|2.98|280 watts|3.58|T5+T20*.95|Power2Max
    Amphkingwest|185 watts|203.3 watts|2.36|300 watts|3.79|T5+T20*.95|Polar / LOOK
    duffyshuffle|272 watts|272 watts|2.81|325 watts|3.61|T5+T20*.95|PowerTap
    slatanic|200 watts|200 watts|3.07| 227watts|3.5|T5+T20*.95|P2M
    Tranche|211 watts|211 watts|3.11| 265watts|3.9|T5+T20*.95|P2M


    Up 30 watts on last test 11 weeks ago so delighted with that.
    Slight variance between the 2 power meters so I'm going with the lower figure as that's prob the most realistic.
    Original Goal of 4.4 achieved so next up is 4.75 w/kg as a target.
    Just another 17 ish watts between now and race season and I'll be happy.

    I suffered tonight. Think I tasted a bit of puke around the 16 min mark, caused a drop off in watts before I copped on and emptied from there...


  • Registered Users Posts: 5 Tranche


    Fazz, good result on increase.

    You had noted a difference between the 2 PM's. Are you running a Power Pilot on the Lemond as well as the Quarq? Which PM showed the lower of numbers as I am having the same issue if so.


  • Closed Accounts Posts: 7,454 ✭✭✭hf4z6sqo7vjngi


    Fazz wrote: »
    I suffered tonight. Think I tasted a bit of puke around the 16 min mark, caused a drop off in watts before I copped on and emptied from there...

    Well done Fazz, ^^sounds like it was well paced so:)^^.
    30w/10% is a big jump. Not surprised really given the power you were holding on the 70k tt a while back.


  • Registered Users Posts: 4,117 ✭✭✭El Director


    Well done Fazz, ^^sounds like it was well paced so:)^^.
    30w/10% is a big jump. Not surprised really given the power you were holding on the 70k tt a while back.

    +1

    Savage form Fazz, you continue on this relentless upward trend :cool:
    As I have a Quarq myself I am interested which PM gave the lower number and the difference between PM's.

    Where did you do it? Was it solo or a group/coach session? Also wondering if you wouldn't mind sharing the file-I will have my first FTP test soon and I want to see what a well paced effort looks like :)


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  • Registered Users Posts: 1,121 ✭✭✭Fazz


    Thanks all. Coach really gets the compliments though I just do what I’m told.

    @Tranche – The Quarq returned the lower watts figure. Has done for all of my sessions. I use the Quarq for my training zones and sessions as it seems very consistent and accurate. Regarding the LeMond, yes a Power Pilot is used with it to get the watts, and in general it seems similar. My comparisons seems to suggest the Power Pilot displays 3s Average Power. The only variance appears on high watts so far – not sure if just one device or not yet.
    I find both the Quarq and LeMond to be consistent in their readings so any differential is meaningless providing I’m training based on just 1 of them. I could of course take the higher figure for an inflated ego but that’s not the purpose.
    On the FTP test last night, both devices returned 30 and 32 watt increases for the 20 minute test (compared to last test) so that’s damn consistent and in my eyes both are perfect training power meters with the Quarq having the added benefit of Race use hence this is the one I use as my bible.

    @Jackyback – thanks, reckon you’ll be due for a nice increase on your next test too hopefully! Though adding the SRM to your arsenal may show up different numbers now. If anything using 2 seperate Power meters could actually skew your training specific intervals (which let’s face it are the main improvement sessions imo). I’d advise sticking to your Race power meter for important interval watts based sessions in my experience.

    @Eldirector – cheers. Yeah the last month things have really come together almost feels like in each of the disciplines so hopefully no signs of slowing my progress curve yet please :-) As stated above, the Quarq returned the lower of the watts figure and that’s the one I use for all training and races so my only concern.
    I did this as part of my usual weekly Base 2 Race Coached Turbo sessions so there were a few others around me suffering and another who had just finished and coincidentally also showed up a 30w increase (In Shotgun’s words, my nemesis :-D ). Slight bit of background tunes but in my head there was only me, my legs, my breathing pattern and those numbers in front of me through the sweat...

    Below my file for your perusal. Felt like it was paced well all bar the slip up near the end – slight loss in concentration/effort before I started giving out to myself and progressed to empty out at the end. As you can see I finished at much higher watts due to simply emptying whatever was left. This started with around 2mins to go and I tried to up effort. I prob left a couple watts out there due to the drop off section though.
    If I was to offer advise, it’s purely to get on with it and suffer. I started pretty much bang on at where I averaged and had a good idea in my head what I wanted based on recent 70k TT calcs so suggests good pacing. Don’t let the voice inside your head telling you to back off win. It will prob come in around the 8 min mark! Once you get to 10 you’re half way there and in the zone. If you don’t have doubts about making it in the first 15 mins then you’re not going hard enough!!
    http://www.trainingpeaks.com/av/HMKPWN5ZZU7LLXSSOBIKAICYPE


  • Registered Users Posts: 4,086 ✭✭✭Bambaata


    Fair play Fazz. I was supposed to do mine last night but mental work prevented that. I am about to do it now though :( Not looking forward to this! First test in a long long time and my body has only seen minor glimpses of pain in recent months so this is going to hurt!

    Just getting the soundtrack ready! Think i'll go with this - https://soundcloud.com/darko-esser/balans025-oscar-mulero


  • Registered Users Posts: 1,171 ✭✭✭BennyMul


    fair play Fazz, savage power there makes me feel very inferior


  • Registered Users Posts: 558 ✭✭✭mrbungle


    Tranche wrote: »
    Fazz, good result on increase.

    You had noted a difference between the 2 PM's. Are you running a Power Pilot on the Lemond as well as the Quarq? Which PM showed the lower of numbers as I am having the same issue if so.


    Hey!

    I ran my power pilot and P2M together the other night for 80min doing various drills, warmup, Z4 12mins, easy, Z4 12mins and a few other bits after.
    I uploaded both files into TP and compared the summaries and trend and from what I could make out the P2M was reading 9-10% lower than the PowerPilot.

    I'm sticking with the P2M as it'll be used for turbo/road/racing for consistency.


  • Registered Users Posts: 12,583 ✭✭✭✭tunney


    mrbungle wrote: »


    Hey!

    I ran my power pilot and P2M together the other night for 80min doing various drills, warmup, Z4 12mins, easy, Z4 12mins and a few other bits after.
    I uploaded both files into TP and compared the summaries and trend and from what I could make out the P2M was reading 9-10% lower than the PowerPilot.

    I'm sticking with the P2M as it'll be used for turbo/road/racing for consistency.

    Strange typically you would expect to see a crank based system read 3-5% higher than something reading from the hub/wheel/cassette.


  • Closed Accounts Posts: 7,454 ✭✭✭hf4z6sqo7vjngi


    Fazz wrote: »
    @Jackyback – thanks, reckon you’ll be due for a nice increase on your next test too hopefully! Though adding the SRM to your arsenal may show up different numbers now. If anything using 2 seperate Power meters could actually skew your training specific intervals (which let’s face it are the main improvement sessions imo). I’d advise sticking to your Race power meter for important interval watts based sessions

    Yep plan is to race and keep the srms on the TT. All specific sessions will be done on it. The P2m will be on the road bike and used for easy rides and the odd long easy spin. Probably too early to tell but feeling is that the srms report about 10w higher than the P2m. I used to ride each bike for 6 months of the year but it makes sense to keep yourself used to riding the TT all year round even if it means on the turbo over Winter. Just gives me greater flexibility now not having to switch cranks over from bike to bike.


  • Registered Users Posts: 4,086 ✭✭✭Bambaata


    User|Starting FTP|Current FTP|Watts/kg|Target FTP|Target Watts/kg|Test|Unit
    Jackyback|298watts|278watts|4.08|320watts|5.00|T5+T20*0.95|Power2Max PM
    NWM2|285watts|327watts|3.9|310watts|3.7|40k TT|Powertap SL+
    pgibbo|232watts|279watts|3.9|300watts|4.35|T5+T20*0.95|Power2Max PM
    Fazz|255 watts|300 watts|4.51|315 watts|4.75|T5+T20*0.95|Lemond/Quarq
    Nerraw|216 watts|216 watts|3.33|280 watts|4.3|T5+T20*0.95|Tacx Flow
    shotgunmcos|318 watts|325 watts|4.23|330watts|4.4|T5+T20*0.95|Tacx Flow
    RedB|230 watts|230 watts|2.55|290 watts|3.5|T5+T20*0.95|Tacx Flow
    BennyMul| 253 watts |231 watts |3.3|270watts|4|T5+T20*0.95|Powertap SL2+
    Bobblehead_jr|345 watts|345 watts|4.9|390 watts|5.6|T5+T20*0.95| iBike iPro
    Macanri|237 watts|237 watts|3.22|?280watts|4.0|T5+T20*0.95|Tacx Flow T2200
    Bambaata|322 watts|319 watts|4|350watts|4.6|T5+T20*0.95|Power2Max PM
    dx22|239 watts|275 watts|3.48|300watts|4.0|T5+T20*0.95|Tacx Flow
    d4r3n|189 watts|210 watts|3.68|240 watts|4.0|T5+T20*0.95|Powertap
    couerdelion|252 watts|299 watts|2.85|315 watts|3.50|T5+T20*.95|Cycleops Magneto + Trainer Road
    bryangiggsy|221 watts|253 watts|3.24|290 watts|3.84|T5+T20*.95|SRM
    Briando|233 watts|233 watts|2.98|280 watts|3.58|T5+T20*.95|Power2Max
    Amphkingwest|185 watts|203.3 watts|2.36|300 watts|3.79|T5+T20*.95|Polar / LOOK
    duffyshuffle|272 watts|272 watts|2.81|325 watts|3.61|T5+T20*.95|PowerTap
    slatanic|200 watts|200 watts|3.07| 227watts|3.5|T5+T20*.95|P2M
    Tranche|211 watts|211 watts|3.11| 265watts|3.9|T5+T20*.95|P2M

    Thank christ that's over! I guessed my FTP was about 310-315 so wasn't far off that. Happy also to see that it is only 3W's below this time last year when i had a winter of cycling in me. Only really back recently after the wedding/honeymoon with 4 nice consistent weeks. Should see big climbs on the 319 within the next few weeks/months and hopefully with a dip in weight i can really push the power to weight ratio close to 4.6W/kg or so


  • Registered Users Posts: 12,583 ✭✭✭✭tunney


    Fazz wrote: »
    @Jackyback – thanks, reckon you’ll be due for a nice increase on your next test too hopefully! Though adding the SRM to your arsenal may show up different numbers now. If anything using 2 seperate Power meters could actually skew your training specific intervals (which let’s face it are the main improvement sessions imo). I’d advise sticking to your Race power meter for important interval watts based sessions in my experience.

    If JB so wished he could alter the slope on the SRMs so that the power matched the P2M. Admitedly then he would have two "wrong" power meters :)

    I do know what you mean on the two PMs. My SRMs read 3% higher than Computrainer. Its awkward maintaining two FTPs. *


    *Yes I could re calibrate my CT to match the SRMs but really both are right (power at wheel should be less than power at crank due to drive train inefficiencies)


  • Registered Users Posts: 558 ✭✭✭mrbungle


    tunney wrote: »
    Strange typically you would expect to see a crank based system read 3-5% higher than something reading from the hub/wheel/cassette.

    Yeah, was expecting something like that.

    All other readings were coming in <1% deviation, HR, Cadence.

    Power just off and below by that high a %.

    Reckoned it was lower anecdotally, reported vs 3s, until I ran it for 80mins.

    P2M it is though.


  • Registered Users Posts: 4,086 ✭✭✭Bambaata


    Have you the older or newer version of the P2M? If its the older are you zero'ing regularly, particularly when riding indoors? I did an FTP test some 16 months ago or so and it came out at 277. A few weeks later i copped this temperature issue and one one ride the power rose 30-40W's after letting it zero!! I zero it as often as possible now in the opening 45mins on the turbo and every 20-30mins thereafter on the long ones. It seems to settle after the opening 40-45mins


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  • Registered Users Posts: 558 ✭✭✭mrbungle


    Bambaata wrote: »
    Have you the older or newer version of the P2M? If its the older are you zero'ing regularly, particularly when riding indoors? I did an FTP test some 16 months ago or so and it came out at 277. A few weeks later i copped this temperature issue and one one ride the power rose 30-40W's after letting it zero!! I zero it as often as possible now in the opening 45mins on the turbo and every 20-30mins thereafter on the long ones. It seems to settle after the opening 40-45mins

    It's about a 3wks old. Might try the zeroing on the next session and run both.

    Though I did an FTP session on the power pilot before I got the p2m and got my result and worked out my power zones and now using the p2m, to me it does feel like the p2m under reads.

    Only way to find out is to run both again and stop for a 2 secs and let it do its zeroing/calibration.

    For my small needs I'd have preferred to have left the p2m on the road bike and the TT hooked up to the power pilot. I'm far from top end but ~10% is way out there


  • Closed Accounts Posts: 7,454 ✭✭✭hf4z6sqo7vjngi


    tunney wrote: »
    If JB so wished he could alter the slope on the SRMs so that the power matched the P2M. Admitedly then he would have two "wrong" power meters :)

    I do know what you mean on the two PMs. My SRMs read 3% higher than Computrainer. Its awkward maintaining two FTPs. *

    *Yes I could re calibrate my CT to match the SRMs but really both are right (power at wheel should be less than power at crank due to drive train inefficiencies)

    As long as i know that the P2M reads x% lower then it should not be a factor especially as i will do all my specific sets on the tt with srms.

    @mrbungle - If its a new unit they should have sorted the temp drift that the P2M suffers with so you should not have to zero it all the time. Perhaps the P2Ms just naturally read low compared to other units? Have a look at DCRainmakers review especially the accuracy element at the bottom. http://www.dcrainmaker.com/2013/01/power2max-power-meter-in-depth-review.html


  • Registered Users Posts: 12,583 ✭✭✭✭tunney


    As long as i know that the P2M reads x% lower then it should not be a factor especially as i will do all my specific sets on the tt with srms.

    @mrbungle - If its a new unit they should have sorted the temp drift that the P2M suffers with so you should not have to zero it all the time. Perhaps the P2Ms just naturally read low compared to other units? Have a look at DCRainmakers review especially the accuracy element at the bottom. http://www.dcrainmaker.com/2013/01/power2max-power-meter-in-depth-review.html

    I'd be very interested to see an overlap of a P2M versus a PT. across a range of wattages and scenarios.


  • Registered Users Posts: 4,377 Mod ✭✭✭✭pgibbo


    tunney wrote: »
    I'd be very interested to see an overlap of a P2M versus a PT. across a range of wattages and scenarios.

    If anyone wants to give me the loan of a PT I'll happily do a comparison :D


  • Registered Users Posts: 12,583 ✭✭✭✭tunney


    pgibbo wrote: »
    If anyone wants to give me the loan of a PT I'll happily do a comparison :D

    I did a CT/PT/SRM comparison a while back, was interesting (for a definition of interesting that most would find boring)


  • Registered Users Posts: 4,377 Mod ✭✭✭✭pgibbo


    tunney wrote: »
    I did a CT/PT/SRM comparison a while back, was interesting (for a definition of interesting that most would find boring)

    Executive summary? I'm guessing based on comments above that both were measuring lower than the SRMs: CT 3% and PT 3-5%


  • Closed Accounts Posts: 7,454 ✭✭✭hf4z6sqo7vjngi


    tunney wrote: »
    I'd be very interested to see an overlap of a P2M versus a PT. across a range of wattages and scenarios.

    Not lab tested but DC has done it in that link above, P2M reading 6w lower out on the road compared to PT and they are similar indoors but i would expect the PT to read lower indoors.


  • Registered Users Posts: 12,583 ✭✭✭✭tunney


    pgibbo wrote: »
    Executive summary? I'm guessing based on comments above that both were measuring lower than the SRMs: CT 3% and PT 3-5%

    Summary - I need bigger handle bars for three computers.

    CT and PT +/- 1 to 2 watts
    CT/PT and SRMs difference 4%, consistent across effort ranges


  • Registered Users Posts: 12,583 ✭✭✭✭tunney


    Not lab tested but DC has done it in that link above, P2M reading 6w lower out on the road compared to PT and they are similar indoors but i would expect the PT to read lower indoors.

    I don't have that much faith in DCs reviews to be honest.

    Confusing lots of pictures with critical analysis I believe.


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  • Closed Accounts Posts: 7,454 ✭✭✭hf4z6sqo7vjngi


    So "a watt is watt" really depends on what you use so:)


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