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Lost in a world of chainrings and cranksets...

  • 28-03-2013 12:35am
    #1
    wowitskev
    Registered Users, Registered Users 2 Posts: 21 ✭


    Hello all

    I'm looking to get a new crankset for my Specialised Tricross (specification list here - http://www.specializedconceptstore.co.uk/Detail/12tricross/tricross/Tricross)

    At the moment I have the stock triple front ring on it (Shimano 2300 52/42/30). Due to a lot of use, surviving a couple of winters and my own foolishness for not taking the best care of it and the chain over the past couple of months I reckon that it's coming to the end of it's useful life.

    I've been trying to find a replacement which isn't working out so easy for me. This seems to be because I have an 8-speed rear cassette and they don't seem to be making triple cranksets to suit them anymore. While I've found a few, none are 175mm (which I'd definitely prefer) and none are black (which would be nice, but not a deal-breaker)

    Having attacked the google-box to try and find out about this it seems to have left me with more questions than answers. :confused:

    - will any triple front crankset suit an 8sp rear cassette?
    - if not how can I identify ones that will (I don't mind if the ratio is different to 52/42/30)
    - would I be as well off changing to a 9sp rear cassette and getting a front crankset that would suit it?
    - if I were to do that, would I also need to change my shifters and derailleurs??

    Needless to say I'll also need a new chain and a new rear cassette, but they seem easy enough to find.

    Apologies if these are stupid questions, I just don't want to be shelling out to buy stuff that won't do the job....

    Thanks in advance!

    Kev


Comments

  • #2
    kumate_champ07
    Closed Accounts Posts: 7,150 ✭✭✭kumate_champ07


    a 9sp crankset will work fine with 8 spd cassette


  • #3
    iregk
    Closed Accounts Posts: 4,235 ✭✭✭iregk


    I have a piggy back question here. What difference does it make really and how do you define what crank length you need. 170, 172.5, 175? Is it height related, inside leg measurement? Also where is that measured from? Is it center of the crank to the end or center of pedal?


  • #4
    ednwireland
    Registered Users, Registered Users 2 Posts: 14,573 ✭✭✭✭ednwireland


    105 euro for a 105 triple(172.5mm cranks)

    http://www.chainreactioncycles.com/Models.aspx?ModelID=11791

    My weather

    https://www.ecowitt.net/home/share?authorize=96CT1F



  • #5
    cdaly_
    Registered Users, Registered Users 2 Posts: 6,440 ✭✭✭cdaly_


    wowitskev wrote: »
    - will any triple front crankset suit an 8sp rear cassette?
    I've been using my 8sp crankset with 9sp chain and cassette for years now. No issues. You should be able to use it the other way around but I'd suggest you use a 9sp chain (which will work fine with an 8sp cassette)
    - would I be as well off changing to a 9sp rear cassette and getting a front crankset that would suit it?
    No need but you might like it.
    - if I were to do that, would I also need to change my shifters and derailleurs??
    You would need new shifters but not derailleur. The indexing is all in the shifter so any 8-9sp derailleur should be fine with 9sp cassette/chain.


  • #6
    wowitskev
    Registered Users, Registered Users 2 Posts: 21 ✭wowitskev


    Hey folks

    Thanks for the answers. Managed to pick up some bits and bobs that should do the job.

    iregk - I don't know if there is a fancy way of determining the ideal crank length, but I'm just going with what I have on that and other bikes. It's what I'm used to so I figure I'll stick with it!

    Again, cheers!


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  • #7
    wowitskev
    Registered Users, Registered Users 2 Posts: 21 ✭wowitskev


    Ok so I got all the parts and started replacing them on the bike. While taking off the crankset the drive side came off fine, but the other side (non-drive side??) was giving me some guff when I was using the crank extraction tool. The pedal didn't seem to want to move and I kept at it and now the crank extraction tool has torn away the threads on the inside of the pedal axis.

    With the chain extraction tool now useless, I tried banging the hell out of the pedal with a rubber mallet but that didn't really help anything other than reducing my frustration.

    Just wondering again what my options are. I was replacing the crankset because the chainrings were all worn, and with this not being the drive side, the pedal should continue to work fine. Although the old pedal that's now stuck is black and the new drive side is silver, so it's not going to match but this bike was never going to win any beauty contests so I don't mind.

    As I see it, my choices are:

    - go with the mismatched crankset, ignore the laughter of others
    - cut off the pedal that's stuck, replace bottom bracket and put the new pedal on
    - hope someone offers up some sneaky method of pedal removal I'm not aware of...

    Again, all help is much appreciated!

    Thanks
    Kev


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