Originally Posted by
masi61
That year of Quantum is going to have the press fit square taper bottom bracket. If you were not OK with the current RX 100 double cranks then you have fewer options for other cranks. You could seek out any 110bcd square taper cranks in order to get a lower gear range for improved hill climbing. You might even get away with running a triple square taper crank with 110/74 bcd such as a deore xt from that era or an XTR M900.
I know how to remove the BB spindle and bearings but I don't possess an original Klein tool nor do I have an improvised tool that can press in a replacement bottom bracket.
The late Sheldon Brown's BB database says the shell is 68mm wide and 35mm - which is just a hair under 1.378" - diameter (presumably that's the ID). Gotta wonder if one of the current threadless repair bottom brackets would fit. Last time I checked, they're still made by Sunrace and at least one other manufacturer specifically for use with frames having stripped BB threads. (Velo Orange formerly sold one also, but they seem to have discontinued theirs.)
They're unfortunately square taper/68mm only, and spindle lengths are limited. But that certainly beats not being able to ride because the BB is shot.
If so, that might provide a replacement option if/when the original BB fails.
I've never owned a Klein, so I haven't ever had to replace or service a Klein press-fit BB. Anyone out there know whether the threadless repair BB option will work on a Klein frame?