Crankset compatibility.

Onan
Onan Posts: 321
edited November 2009 in The workshop
How do I know if a new crankset (FSA for instance) will be compatible with my current bottom bracket (Not sure exactly what that is, but it's on a tiagra 9-speed standard double).

Thanks in advance.
Drink poison. Wrestle snakes.

Comments

  • cjcp
    cjcp Posts: 13,345
    If you'e got the Hollowtech Tiagra chainset

    http://www.parker-international.co.uk/2 ... gn=pid2621

    you'll have outboard bottom bracket cups - they're on the outside of the frame - http://www.wiggle.co.uk/p/cycle/7/Shima ... 360027350/

    Here's an example of an FSA chainset. You can see the bottom bracket cups, which should come with the chainset anyway, but they're like your Tiagra BB.

    http://www.wiggle.co.uk/p/cycle/7/FSA_G ... 1893/#more

    Does that confuse matters? :)
    FCN 2-4.

    "What happens when the hammer goes down, kids?"
    "It stays down, Daddy."
    "Exactly."
  • Onan
    Onan Posts: 321
    Yep, that looks like what I have. Thanks.

    I got kind of confused in all the jargon. Octalink. Hollowtech. MegaExo. It's a minefield.
    Drink poison. Wrestle snakes.
  • Onan
    Onan Posts: 321
    Another question. If I tried to run a "10 speed compatible" shimano r600 compact chainset with my 9 speed tiagra setup, what would happen?
    Drink poison. Wrestle snakes.
  • cjcp
    cjcp Posts: 13,345
    Yup. It's compatible with 9 or 10 speed chains.
    FCN 2-4.

    "What happens when the hammer goes down, kids?"
    "It stays down, Daddy."
    "Exactly."
  • Onan
    Onan Posts: 321
    cjcp wrote:
    Yup. It's compatible with 9 or 10 speed chains.

    Well, honestly. You'd think they'd tell you that. I even looked at the technical doccuments, and couldn't find that out. Honestly, sometimes, it's like they're trying to make it difficult for you.

    Thanks for your help.
    Drink poison. Wrestle snakes.
  • nicklouse
    nicklouse Posts: 50,675
    you may a get a little more chain rub in certain gear combos.
    "Do not follow where the path may lead, Go instead where there is no path, and Leave a Trail."
    Parktools :?:SheldonBrown
  • cjcp
    cjcp Posts: 13,345
    nicklouse wrote:
    you may a get a little more chain rub in certain gear combos.

    Nick - is that because of the width of the front mech?
    FCN 2-4.

    "What happens when the hammer goes down, kids?"
    "It stays down, Daddy."
    "Exactly."
  • nicklouse
    nicklouse Posts: 50,675
    nope i believe the 10spd rings are a little closer together.

    I have noticed more rub on 10spd set ups than 9spd and then in this case we would be using a slightly wider chain.

    But road stuff aint my thing but have built a few and serviced a few so i am prepared to be corrected.
    "Do not follow where the path may lead, Go instead where there is no path, and Leave a Trail."
    Parktools :?:SheldonBrown
  • cjcp
    cjcp Posts: 13,345
    Onan wrote:
    cjcp wrote:
    Yup. It's compatible with 9 or 10 speed chains.

    Well, honestly. You'd think they'd tell you that. I even looked at the technical doccuments, and couldn't find that out. Honestly, sometimes, it's like they're trying to make it difficult for you.

    Thanks for your help.

    No problem. The instructions for the RaceFace Cadence chainset nearly sent me wild with rage.
    FCN 2-4.

    "What happens when the hammer goes down, kids?"
    "It stays down, Daddy."
    "Exactly."
  • cjcp
    cjcp Posts: 13,345
    nicklouse wrote:
    nope i believe the 10spd rings are a little closer together.

    I have noticed more rub on 10spd set ups than 9spd and then in this case we would be using a slightly wider chain.

    But road stuff aint my thing but have built a few and serviced a few so i am prepared to be corrected.

    That makes sense. What if you stick a 10sp chain on? Would that be a problem if the cassette is 10sp compatible?
    FCN 2-4.

    "What happens when the hammer goes down, kids?"
    "It stays down, Daddy."
    "Exactly."
  • nicklouse
    nicklouse Posts: 50,675
    this is where things get fun.

    On the rear it should be fine as it shifts from the inside of the chain.

    but at the front, as it shifts on the outside of the chain) set up could be a tad more "acurate" to get smooth shifts.

    but again i have had roadies say that you cant use road front mechs on MTBs with MTB front shifters.

    :wink:
    "Do not follow where the path may lead, Go instead where there is no path, and Leave a Trail."
    Parktools :?:SheldonBrown
  • cjcp
    cjcp Posts: 13,345
    Yeah, I won't be going there. :)
    FCN 2-4.

    "What happens when the hammer goes down, kids?"
    "It stays down, Daddy."
    "Exactly."

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