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Crank problems

Old 06-17-20, 08:43 AM
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Sobeisdead
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Crank problems

Hello so I'm building a old Italian bike and I was thinking of a rotor 30mm crankset that I already have. I got the bb for the bike and turns out the spindle is too short. Is it the bb or the crank? Any ideas? I'm about to give up on this project.

Thanks.
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Old 06-17-20, 08:55 AM
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My guess is your Italian bike is probably a 70mm shell width (standard italian) and your new crank/BB is designed for 68mm shell width
Measure first and buy once.
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Old 06-17-20, 09:09 AM
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Originally Posted by dedhed View Post
My guess is your Italian bike is probably a 70mm shell width (standard italian) and your new crank/BB is designed for 68mm shell width
Measure first and buy once.
Anyway around this?
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Old 06-17-20, 09:50 AM
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Originally Posted by Sobeisdead View Post
Anyway around this?

I don't know what your BB is or frame shell, so I can't say. You need to determine your shell width and threading and ask Rotor.

https://rotorbike.com/catalog/defaul...eel-black.html
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Old 06-17-20, 10:55 AM
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Most 30mm cranksets are made for press fit frames where the bearing are inside the frame. There are 30mm bottom brackets for threaded frames, but the bearings are outside the frame and require a special crankset with a longer spindle. If the Rotor crank is a PF30 or BB30, it will never fit that frame.
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Old 06-17-20, 03:30 PM
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Originally Posted by dedhed View Post
I don't know what your BB is or frame shell, so I can't say. You need to determine your shell width and threading and ask Rotor.

https://rotorbike.com/catalog/defaul...eel-black.html
These are the specs that I have.
The frame size is 58cm c to c and the top tube is 58cm c to c.

Head tube is 6 3/8".

The steerer tube threading is English/ISO/Italian (25.4mm x 24TPI).

The seat post diameter is 27.2mm.

Back spacing is 126mm.

BB threading is 36 x 24 Italian and has been faced and chased.
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Old 06-17-20, 03:33 PM
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Originally Posted by dsaul View Post
Most 30mm cranksets are made for press fit frames where the bearing are inside the frame. There are 30mm bottom brackets for threaded frames, but the bearings are outside the frame and require a special crankset with a longer spindle. If the Rotor crank is a PF30 or BB30, it will never fit that frame.
Yes I have a ITA frame and the bb is external(trying to be modern) Do you have any suggestions on what crank I should get? I really dont want to switch the Bottom bracket if possible.
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Old 06-17-20, 04:30 PM
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Originally Posted by Sobeisdead View Post
Yes I have a ITA frame and the bb is external(trying to be modern) Do you have any suggestions on what crank I should get? I really dont want to switch the Bottom bracket if possible.
What BB did you get ?
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Old 06-17-20, 04:56 PM
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Originally Posted by Sobeisdead View Post
Yes I have a ITA frame and the bb is external(trying to be modern) Do you have any suggestions on what crank I should get? I really dont want to switch the Bottom bracket if possible.
That depends on what bottom bracket you have. The only crankset that I know of that works with an external 30mm bottom bracket if the FSA 386 EVO system.
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Old 06-17-20, 05:13 PM
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Originally Posted by trailflow1 View Post
What BB did you get ?
The bb is a Kogel ITA 30
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Old 06-17-20, 06:32 PM
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Originally Posted by Sobeisdead View Post
The bb is a Kogel ITA 30
Your crank options are FSA 386EVO, Rotor 3D+, THM Clavicula, and Sram PF30 (Force22, Rival22, Force1, Rival1, Apex1)

Last edited by trailflow1; 06-17-20 at 06:43 PM.
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Old 06-17-20, 08:48 PM
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Originally Posted by trailflow1 View Post
Your crank options are FSA 386EVO, Rotor 3D+, THM Clavicula, and Sram PF30 (Force22, Rival22, Force1, Rival1, Apex1)
Thanks a bunch! Will look into this! ✌
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