So thought this would be very simple but I'm a touch confused.
Fitting an uber BB to my 2016 foxy running 2x10 with a SRAM crankset.
BB shell is 73mm so in theory I don't need any spacers between frame and BB cups.
However when I install the cranks there is a space between the crank arm and BB cup on drive side so if tapped with a mallet it pushes the bearings out of the non drive side.
The BB also came with a small spacer that fits over the crank spindle but this still doesn't quite fill the gap.
Looks to me to maintain the original chain line I need to put one of the spacers on the non drive side between frame and cup and then the little spacer to plug the gap on the drive side.
This would though then move the non drive crank arm 2.5mm out.
Anyone had any experience on this? Thought it would replace like for like but can't be right.
Cheers for your help in advance
The gap is supposed to be there. GXP only holds the spindle tight on the non drive side. The drive side is designed to float. Looks weird compared to other bb types but just tighten everything up and it’ll be fine.
Once all tightened up tho if I tap the drive side crank with a rubber mallet it pushes the bearings out of the non drive side until the crank sits flush against the drive side cups.
Can't be right that only thing holding crank in place is the friction of the bearings in the BB cup.
Can’t be right that only thing holding crank in place is the friction of the bearings in the BB cup.
SRAM ones have a circlip that holds the bearings in. I can't speak for an Uber one but as its a conversion then it wouldnt be entirely surprising.
Ah so it does, the Uber one doesn't have a circlip so it can just push out.
General quality etc of the Uber seems spot on. Just can't quite make sense of this.
Hmmmm why is nothing simple.
All sorted. Needed a spacer on non drive side. Uber have a tech sheet that shows spacer positioning. Just wasnt available on the page for the colour of BB I bought.
Thanks for advice still!