Bottom bracket problem

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05-02-26 | 03:14 AM

daveking56

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Joined: May 2026

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Bottom bracket problem

Hi
My grandson just snapped his one piece setup and i had
a bottom bracket from my mountain bike.
Got the adapters to fit the bottom bracket and used a
MTB crank set.
Now the chain ring sits too far out.
I tried spacer rings but not working.
What have i done wrong.
The bike is a Big Daddy..

Thank you.

Dave king

05-02-26 | 01:37 PM

Mad Honk

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Joined: May 2019

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From: Bloomington, IN

Bikes: Paramount, Faggin, Ochsner, Rossin, Ciocc

Try turning the spindle around in the adaptor. HTH smiles, MH

05-02-26 | 02:54 PM

grumpus

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Joined: Apr 2016

Posts: 3,816

Likes: 1,757

Quote:

Originally Posted by Mad Honk

Try turning the spindle around in the adaptor. HTH smiles, MH

I think that would more likely be "Try turning the adaptor around in the frame."

05-02-26 | 08:12 PM

maddog34

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Joined: Jul 2015

Posts: 7,342

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From: NW Oregon

Bikes: 1982 Trek 930R Custom, '91 Diamondback Ascent w/ XT, XTR updates, Fuji Team Pro CF road flyer, Specialized Sirrus Gravel Convert, '09 Comencal Meta 5.5 XC, '02 Marin MBX500, '84 Gitane Criterium bike

Quote:

Originally Posted by daveking56

you'll need to use the Correct Length Bottom Bracket for that "used crankset"... cranksets tend to vary from maker to maker, and by era too.

what length BB did you install?is the spindle square on both ends, or does it use a spline?
Spindle Length and Shell width play into the equation... what is the outer width of the adapter, as mounted in the bike?

Last edited by maddog34; 05-02-26 at 08:21 PM.