I bought a Sram red BB from an Ebay merchant. The item description reads:
SRAM/Truvativ GXP Blackbox Ceramic Bottom Bracket Cups - Italian Thread
SRAM's new hybrid Ceramic BB Bearings exceeds the needs of even the most demanding riders. Ceramic bearings are more resistant to dirt and moisture require an astonishing 78% less energy than the next most efficient BB on the market. It features:
Left and right bottom bracket bearing cup set for use on Giga X Pipe cranks with integrated GXP pipe spindle: includes plastic seal/spacer-shell with o-rings
BlackBox (ceramic bearing) and Team (sealed bearing) cups available for replacement: can be used to replace/upgrade XR-series GXP systems
Includes (2) 2.5mm spacers to fit either 68mm or 73mm BB shells
Material: Ceramic balls / Stainless Steel Races
Compatibility: SRAM and Truvativ, Giga X Pipe, GXP cranksets
Italian Thread: 70mm
Weight:
105 grams
I have an italian 70mm shell. When I received the part I held it up to my shell to find that it's too short for a 70mm shell. Looks like 63mm-ish. I was able to fully screw both cups in to confirm that it really is the right thread type. But sure enough, when both sides were screwed in all the way (just hand tight, but flush against the frame) the connecting pipe didn't reach all the way across to the other cup and leaves what looks like an 7mm gap. Rather than just returning the product, and depending on the seller for a fix, I'd like to first understand the part correctly. Learning some self sufficiency is part of the point of doing the service work myself.
My questions for you are:
- Additionally I don't see any spacers in the package (which did appear to be factory sealed). The seller is telling me, "nope that's should fit a 70mm shell. Besides Italians only come in 70mm shells". What could I be doing wrong?
- Is the sellers statement correct or should this product come in differing shell widths? If it does come in different widths, what's the difference? Is it just the length of the connecting pipe?
- What do you recommend here?
Thanks for any help 