F&@£ing bottom brackets!!!

[bontybonty]

It's basically down to trial and error with square taper. Use a cheep shimano unit too establish the right length. Them track down a better one ie XT when you have the size.

 

[FluffyChicken]

You can tell a lot from the look of the crank, it all about where the larger rings seats sit in relation to the axle hole.
Then tweak if needed.

 

[Betsy]

Last time i ended up making a little wooden model.. took me all of 10mins



...pushed it in


..pushed the crank on, made sure the rings didn't rub the frame, marked a line, measure the axle.. bobs yer uncle.

 

[Jimmy oldskool]

Last time i ended up making a little wooden model.. took me all of 10mins

View attachment 804279

...pushed it in
View attachment 804280

..pushed the crank on, made sure the rings didn't rub the frame, marked a line, measure the axle.. bobs yer uncle.

That’s awesome!!!