GXP Bottom Bracket Help- Rubbing but need to use spacer- SOLVED

[sean]

I'm building up a cross bike for a friend with some Truative Rouleur cranks. The BB for it is a gxp.

According to the instructions, I'm supposed to install it w/o spacers. When I do, all is almost fine except I'm running a single ring with a chainring sandwich.

The inside bash guard hits the frame just slightly. So I added some spacers. Perfect! Except now the spider of the drive side rubs against the cup.

Any ideas?

[oldpotatoe]

I'm building up a cross bike for a friend with some Truative Rouleur cranks. The BB for it is a gxp.

According to the instructions, I'm supposed to install it w/o spacers. When I do, all is almost fine except I'm running a single ring with a chainring sandwich.

The inside bash guard hits the frame just slightly. So I added some spacers. Perfect! Except now the spider of the drive side rubs against the cup.

Any ideas?

If the frame is metal, you can place a socket against that place where the ring rubs and smack it with a hammer, making a wee dent there. Depends on how dear the frame is but it won't hurt it. Done this on steel, ti and aluminum.

[ultraman6970]

Just put a spacer man.

[sean]

Did you read the post? Spacer is the issue.

[ultraman6970]

Where is he putting the spacer?? you can put an spacer between the cup and the frame that will move the crank a tiny bit, around 3 mm is the usual size.

[sean]

Again. You gotta read the first post. He (meaning me) is putting the spacer between the frame and the cup as you are supposed to. The issue is the cup (GXP is external) is rubbing against the spider of the cranks.

[sean]

PROBLEM SOLVED. Turns out I was using a newer crank with an older GXP Bottom Bracket. The older ones have squared shoulders while the newer ones have beveled shoulders. Hits in all the right spots, even WITH the spacer to push out the chainline a bit.

I've seen a lot of thread online about this with no answers, hopefully this will help someone else.