i've got two frames which i swap parts between (rocky mountain element and spesh enduro). The rocky has a 73mm bb, the spesh 68. Fine with a ht2 chainset due to spacers but i'm considering using a square taper again and that'd mean two bbs. So any issues with facing the rocky down to 68mm. There's plenty of clearance and the bb threads are deep enough.
facing a 73mm bb shell to 68mm
just pick up a cheap chainset. it would be a lot easier
Now I'm not a clever bloke...
can't you just put a BB in each - with the same length axle but a different shell size
I wouldn't fancy repeatedly swapping a bb over, you'll end up buggering a thread sooner or later
I'd just have 2 BBs...UN54s only cost a bit over a tenner.
yeah, i guess, you're probably right. I just don't see the point of a 73mm bb on an xc frame. And i have a decent 68mm bb already.
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