Rotor cranks

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  • I'm using 3df's on my winter bike and the Rotor BB is already dry as a bone after 6 months - looking for a cheaper/more durable alternative.

    Has anyone tried using rotor 3df cranks with a shimano BB?

  • Interested in the results of this- the Rotor BB is far from cheap.

    You can get equivalent units from Bdop I believe (to the Rotor unit).

  • Bdop?

  • Bdopcycling.com

  • I have asked the two bicycle mechanics I know... will report back.

  • ^^ ah yes.. I was too lazy to google.

  • In theory, I don't see why you can't run a standard bb30 to BSA adaptor.

  • Can you not just pop the seals and regrease the BB with decent grease?

  • In theory, I don't see why you can't run a standard bb30 to BSA adaptor.

    Needs to be BSA to BB30, not BB30 to BSA.

  • dafuq? Frame is BSA.

  • Do Rotor 3DFs come in 24mm flavour?

    If not then I think you are stuck with the rotor or zipp adapter.

    If so then just buy a shimano 24mm bb and give it a whirl. I don't think Rotor 24mm cranks have any GXP like axle tapering weirdness to them that would prevent any old (i.e. shimano standard) 24mm BB from working as intended.

  • Mechanic no.1: he say NO.

  • Did he say why? Genuinely curious.

  • Can you drift the bearings out of the cups ? Just thinking it's unlikely they've used anything special and once they're out they may be marked with the size and you can buy and drift new better ones in from a decent bearing supplier

  • dafuq? Frame is BSA.

    Exactly. My understanding is that the Rotor BB converts BSA to BB30.

    i.e. it has two bearing cups which screw into the threads of the BSA shell and hold the outboard bearings which accept the 30mm axle of the Rotor 3DF.

    The converters on the market mainly allow you to reduce BB30 bottom brackets to 24mm (or to fit a conventional square taper BB).

    The 3DF with it's 30mm spindle is not going to fit in any of those.

  • rotor bb cups look cool.

  • Exactly. My understanding is that the Rotor BB converts BSA to BB30.

    i.e. it has two bearing cups which screw into the threads of the BSA shell and hold the outboard bearings which accept the 30mm axle of the Rotor 3DF.

    The converters on the market mainly allow you to reduce BB30 bottom brackets to 24mm (or to fit a conventional square taper BB).

    The 3DF with it's 30mm spindle is not going to fit in any of those.

    Kind of.

    Two type of Rotor BBs - a 24mm BSA for the original Rotor 3D and the BSA30 BB that allows you to use 30mm Rotor cranks in BSA frames.

    Using the BSA30 BB allows you fit 'BB30ish' cranks to BSA frames. The only thing these cranks have in common with BB30 is that the spindle is 30mm. They will not allow a 'pure' BB30 crank such as Hollowgram or SRAM Red BB30 to work on a BSA frame.

    In theory, you could take a BB30 frame, insert a BB30 to BSA adapter then fit the BSA30 BB then fit Rotor 3D+/F cranks. I bet someone, somewhere has actually done this.

  • Yep, agree with all that. I don't see how it's "kind of" though?

    i.e. Dan has 3DF cranks, which are BB30.

    He needs a BSA to BB30 bottom bracket to use them on his BSA frame.

    A BB30 to BSA converter won't be any use to him.

  • It might work with an inverse shim.

  • Yep, agree with all that. I don't see how it's "kind of" though?

    i.e. Dan has 3DF cranks, which are BB30.

    He needs a BSA to BB30 bottom bracket to use them on his BSA frame.

    A BB30 to BSA converter won't be any use to him.

    I was just picking holes - self inflicted joblessness has turned me into an internet bore.

    You can't convert a BSA frame to BB30 which is fortunate as 3DF cranks aren't BB30 - they just happen to have a 30mm spindle. Like S950 and Vuma Quad.

    Adding the Rotor BSA30 just allows you to use these 'long spindled' 30mm cranks.

    It might work with an inverse shim.

    The 3mm ones are as rare as hens teeth. And you'd need two.

  • Fair enough, I award you two Pedoints.

  • Thread ruined, my work here is done etc.

  • Damn, I was about to say just the same thing. Guess I'll have to earn my Pedpoints elsewhere. It's something I was thinking about a while back, before realising that 3DF cranks aren't BB30, at which my whole teetering pile of cards fell in a heap.

  • They'll happily go on a BB30 frame with the two supplied 11mm spacers.

  • I have, somewhat to my surprise, one pair each of 3D, 3DF and 3D+.

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Rotor cranks

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