Buying a new left crank...quick question

Blade180
Blade180 Posts: 70
edited February 2017 in Workshop
I just have a quick question. Will any left crank fit as long as its 175mm like mine and same bolt input (diamond shape)?
As I don't want to buy a new chainset like I was recommend by LBS. My chainset is brand new, all I need is left crank which I found relatively cheap 175mm.

Comments

  • trailflow
    trailflow Posts: 1,311
    More info is needed. What model of crank do you have ? and a link to the crank arm your about to buy would help.

    Edit: Which bike did buy ?
  • Blade180
    Blade180 Posts: 70
    trailflow wrote:
    More info is needed. What model of crank do you have ? and a link to the crank arm your about to buy would help.

    Edit: Which bike did buy ?

    cannondale caad8 2016 road bike
  • Blade180
    Blade180 Posts: 70
    the crank is FSA Vero, 50/34
  • davesnothere
    davesnothere Posts: 620
    Which model? They do a Claris, Sora and a 105 version

    Claris
    Shimano%20Claris%202400%20-%20compact%20silver.jpg

    Sora
    shimano_sora_r3000-1_20160229.jpg

    105
    fc5800a04l.jpg?w=1600&h=1600&a=7
    GET WHEEZY - WALNUT LUNG RACING TEAM™
  • davesnothere
    davesnothere Posts: 620
    FWIW given the issues that you've had, I would get a bike shop to fit it.

    I would also fit the original Shimano part, you've spent good money on a nice bike, why put a cheapo part on just to save a couple of quid?
    GET WHEEZY - WALNUT LUNG RACING TEAM™
  • Blade180
    Blade180 Posts: 70
    its a claris and yes I saw shimano left crank its 175mm but don't know if it will fit :/
  • fenix
    fenix Posts: 5,437
    Do you know how to get the crank off ? Then you can check what it looks like ?
  • keef66
    keef66 Posts: 13,123
    The rest of the Groupset is Claris but the chainset is the aforementioned FSA Vero, so a Shimano arm will look a bit odd or won't fit.

    (The 50/34 bit refers to the size of the chainrings)

    You just need a left crank arm the same length as the original, JIS square taper.

    Don't pay a fortune for one though, you can get a whole new FSA Vero compact chainset for £47 from Chain Reaction...

    And while you're shopping, buy a pedal spanner!
  • trailflow
    trailflow Posts: 1,311
    edited January 2017
    You need to clarify exactly what chainset you have. You are giving conflicting info. The specs of the 2016 synapse say it's an FSA Vero chainset. But your bike also comes with Claris gearing which could be causing some confusion.

    Does your crank arm say Shimano Claris on the side like the picture above ?

    Either way its a 'square tapered' type crank and is only compatible with square tapered arms. Not sure different brands can be mixed and matched. Somebody else will need to chime in.
  • keef66
    keef66 Posts: 13,123
    Laurynas wrote:
    the crank is FSA Vero, 50/34

    I think we know what the crank is.....
  • Blade180
    Blade180 Posts: 70
    keef66 wrote:
    Laurynas wrote:
    the crank is FSA Vero, 50/34

    I think we know what the crank is.....

    So any 175mm left crank will do with a square taper?
  • keef66
    keef66 Posts: 13,123
    Laurynas wrote:
    keef66 wrote:
    Laurynas wrote:
    the crank is FSA Vero, 50/34

    I think we know what the crank is.....

    So any 175mm left crank will do with a square taper?

    JIS square taper, yes.
  • Blade180
    Blade180 Posts: 70
    keef66 wrote:
    The rest of the Groupset is Claris but the chainset is the aforementioned FSA Vero, so a Shimano arm will look a bit odd or won't fit.

    (The 50/34 bit refers to the size of the chainrings)

    You just need a left crank arm the same length as the original, JIS square taper.

    Don't pay a fortune for one though, you can get a whole new FSA Vero compact chainset for £47 from Chain Reaction...

    And while you're shopping, buy a pedal spanner!

    I found some hopefully it will fit, I was recommended by tredz. Don't know which one is more durable.
    http://www.tredz.co.uk/.ETC-Left-Hand-Crank_33366.htm
    http://www.tredz.co.uk/.SR-Suntour-CCC8 ... _62258.htm
  • fenix
    fenix Posts: 5,437
    Durability shouldn't really be an issue here. A crank breaking is very rare indeed. Just don't cock the thread up again.
  • cooldad
    cooldad Posts: 32,599
    Beware of buying random crank arms. The squares on some are 90 degrees to others, so some won't work. I think FSA and Shimano are incompatible, but not sure and can't be bothered to play Google.
    I don't do smileys.

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  • The Rookie
    The Rookie Posts: 27,816
    cooldad wrote:
    Beware of buying random crank arms. The squares on some are 90 degrees to others, so some won't work. I think FSA and Shimano are incompatible, but not sure and can't be bothered to play Google.
    Being at 90 degrees on a square taper would be the same think?

    45 degrees perhaps?

    It's an old age thing I'm told! :lol:
    Currently riding a Whyte T130C, X0 drivetrain, Magura Trail brakes converted to mixed wheel size (homebuilt wheels) with 140mm Fox 34 Rhythm and RP23 suspension. 12.2Kg.
  • cooldad
    cooldad Posts: 32,599
    Yeah, that's the one. Like a V shaped shape, not an L shaped shape.

    ps It's same thing, not think. Perhaps an old age thing?

    Carry on.
    I don't do smileys.

    There is no secret ingredient - Kung Fu Panda

    London Calling on Facebook

    Parktools
  • The Rookie
    The Rookie Posts: 27,816
    Damn predictive spelling, I blame that on my extreme youth!
    Currently riding a Whyte T130C, X0 drivetrain, Magura Trail brakes converted to mixed wheel size (homebuilt wheels) with 140mm Fox 34 Rhythm and RP23 suspension. 12.2Kg.

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