BB30 Cranks in a Normal BB

Velonutter
Velonutter Posts: 2,437
edited June 2012 in Workshop
Hi All,

My mate is after some SRAM Cranks for his standard Bianchi 928 Bottom Bracket.

I've seen some in the Classifieds, but the are advertised as BB30, do I need an adapter to fit them to a normal Italian BB or are they incompatible?

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Comments

  • Herbsman
    Herbsman Posts: 2,029
    You need a negative shim to downsize the crank axle to fit the BB shell.
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  • Velonutter
    Velonutter Posts: 2,437
    Herbsman wrote:
    You need a negative shim to downsize the crank axle to fit the BB shell.

    Many Thanks, are the negative shims easy to get hold of and expensive?
  • Wheelspinner
    Wheelspinner Posts: 6,726
    The only "adaptors" I've seen to use a BB30 crank in an English BB are made by Rotor, but whether they are specific for the Rotor cranks or not I don't know.

    http://www.rotorbikeusa.com/products/bsa_bottom_bracket.html

    bsa30_cer_1_web.jpg
    Otherwise, you are up sh!t creek AFAIK....
    Open One+ BMC TE29 Seven 622SL On One Scandal Cervelo RS
  • nweststeyn
    nweststeyn Posts: 1,574
    I'd recommend just waiting it out until a suitable non-BB30 crankset becomes available!
  • mrdsgs
    mrdsgs Posts: 337
    The Rotor converter won't fit an italian thread BB, it is BSA only!
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  • Velonutter
    Velonutter Posts: 2,437
    Thanks for all your replies, much appreciated.
  • Monty Dog
    Monty Dog Posts: 20,614
    FWIW you can't fit a BB30 crank to a regular threaded BB shell as there's nowhere for the bearings to go. The info on the Rotor BB is incorrect, whilst Rotor cranks use a 30mm spindle, they are longer and use an outboard bearing BB arrangement, not an inboard bearing like BB30. A BB30 crank spindle is 68mm long whereas the Rotor BSA30 is something like 90mm to give enough room for the bearings.
    Make mine an Italian, with Campagnolo on the side..
  • Velonutter
    Velonutter Posts: 2,437
    Monty Dog wrote:
    FWIW you can't fit a BB30 crank to a regular threaded BB shell as there's nowhere for the bearings to go. The info on the Rotor BB is incorrect, whilst Rotor cranks use a 30mm spindle, they are longer and use an outboard bearing BB arrangement, not an inboard bearing like BB30. A BB30 crank spindle is 68mm long whereas the Rotor BSA30 is something like 90mm to give enough room for the bearings.


    Thanks Monty, I'll advise my Mate
  • edindevon
    edindevon Posts: 325
    Right now you can get a Sram Rival Alloy Chainset & GXP Bottom Bracket for £76 from Merlin.

    I'd have thought this is as good an option as any for your mate.

    Just to add that as I understand it, the Bianchi has English bottom bracket threads.

    Edindevon
  • Velonutter
    Velonutter Posts: 2,437
    Edindevon wrote:
    Right now you can get a Sram Rival Alloy Chainset & GXP Bottom Bracket for £76 from Merlin.

    I'd have thought this is as good an option as any for your mate.

    Just to add that as I understand it, the Bianchi has English bottom bracket threads.

    Edindevon

    Thanks for the info, he currently has a carbon double and wants a carbon compact for the Italian hills.
  • mrdsgs
    mrdsgs Posts: 337
    £45.00 plus postage from Velotech

    Job done!

    http://www.velotechservices.co.uk/shop/ ... 7416002009
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  • Velonutter
    Velonutter Posts: 2,437
    mrdsgs wrote:
    £45.00 plus postage from Velotech

    Job done!

    http://www.velotechservices.co.uk/shop/ ... 7416002009

    Many6 Thanks for that, but with the £45 + the purchase price it makes them unrealistic, but much appreciate your help.