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Tyre liners worth investing???

  • 01-04-2011 10:10PM
    #1
    deise muay thai
    Closed Accounts Posts: 80 ✭✭


    Are tyre liners worth investing, I've a long race coming in june and could do without the hassle of punctures, are these worth goin for?


Comments

  • #2
    Raam
    Registered Users, Registered Users 2 Posts: 14,318 ✭✭✭✭Raam


    A team car, lots of spare wheels and a mechanic might be handier, but may be more expensive.


  • #3
    Beasty
    Administrators, Social & Fun Moderators, Sports Moderators Posts: 78,456 Admin ✭✭✭✭✭Beasty


    deise muay thai wrote: »
    I've a long race coming in june

    What do you mean by race? A proper race, where every second counts, or something a little more relaxed? What's the distance involved? If you have the right tyres and prepare properly your chances of getting a puncture on a particular day are pretty low (I reckon I get one on average every 3,000km or so)


  • #4
    deise muay thai
    Closed Accounts Posts: 80 ✭✭deise muay thai


    quintuple ironman so i'll be doin 112miles a day for 5 days on the bike and it'll be a very relaxed pace especially by day 5 :rolleyes:

    I'll be on conti gp4000s which i haven't used before, i suppose if i kepp em at 130psi i wont be to bad?


  • #5
    blorg
    Registered Users, Registered Users 2 Posts: 15,995 ✭✭✭✭blorg


    1. Higher pressure does not reduce the chance of penetrative punctures, it increases it (and will slow you down.) You need to be high enough to avoid pinch flats but 130 is too high.

    2. Make sure you try out the tyres before the race. GP4000s are good and have reasonable puncture resistance for a road tyre. There are other options like Schwalbe Ultremo (my prefernce) but don't get a tyre that is good for racing but has a rep for punctures if that is important to you (the likes of Vittoria Open Corsa or Michelin Pro3.)

    3. Don't use liners, they will increase RR and ruin the road feel. Carry CO2 and consider something like Vittoria Pit Stop which I believe works in a few seconds, 50% of the time. I have it for my tubs but never had to use it.

    Support car with spare wheels is the standard appoach in important road races but I presume outside assistance is banned in triathlon.


  • #6
    C3PO
    Registered Users, Registered Users 2 Posts: 3,814 ✭✭✭C3PO


    deise muay thai wrote: »
    quintuple ironman so i'll be doin 112miles a day for 5 days on the bike and it'll be a very relaxed pace especially by day 5 :rolleyes:

    ........... and I presume 12 miles swimming and 130 miles running over the 5 days? Massive Respect!


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  • #7
    deise muay thai
    Closed Accounts Posts: 80 ✭✭deise muay thai


    RPL1 wrote: »
    ........... and I presume 12 miles swimming and 130 miles running over the 5 days? Massive Respect!

    Yup should be lovely few days out :). Thanks


  • #8
    feck sake lads
    Closed Accounts Posts: 2,889 ✭✭✭feck sake lads


    wow this is serious stuff very best of luck .dont worrie about p....... but you intended pressure is way to high 100psi is the sweet spot;)


  • #9
    Paul Kiernan
    Registered Users, Registered Users 2 Posts: 2,231 ✭✭✭Paul Kiernan


    blorg wrote: »
    1. Higher pressure does not reduce the chance of penetrative punctures, it increases it (and will slow you down.)

    I knew higher pressure would make ride more uncomfortable but I didn't think it would slow you down?


  • #10
    blorg
    Registered Users, Registered Users 2 Posts: 15,995 ✭✭✭✭blorg


    Paul Kiernan wrote: »
    I knew higher pressure would make ride more uncomfortable but I didn't think it would slow you down?
    With very high pressures you will bounce (slightly) into the air over every road imperfection. This wastes energy and slows you down. With a perfectly smooth surface (eg a wooden track) it can make sense to run very high pressures. Not on a tarmac road much less an Irish one. The lack of comfort will also hurt performance but that wasn't my main point.


  • #11
    Paul Kiernan
    Registered Users, Registered Users 2 Posts: 2,231 ✭✭✭Paul Kiernan


    blorg wrote: »
    With very high pressures you will bounce (slightly) into the air over every road imperfection. This wastes energy and slows you down. With a perfectly smooth surface (eg a wooden track) it can make sense to run very high pressures. Not on a tarmac road much less an Irish one. The lack of comfort will also hurt performance but that wasn't my main point.

    Which begs the question - what is the optimum pressure? Is it the lowest you won't "bottom out" on? I was running 80psi over the winter on a 25c front and 28c rear (80kg combined weight) but after a nasty snakebite from a pothole I upped it to 100psi. Didn't notice any difference in performance but ride was less supple.


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  • #12
    Beasty
    Administrators, Social & Fun Moderators, Sports Moderators Posts: 78,456 Admin ✭✭✭✭✭Beasty


    One thing you could do to minimise the risk of punctures is closely examine the tyres each day for "foreign objects". I normally do this every week and suspect this is part of the reason I don't suffer many punctures. There is often a bit of stone or glass embedded in the tyre which is likely to ultimately penetrate the tube if not removed


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