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BB dilemma revisited(4 posts)

BB dilemma revisitedLazy
Jun 21, 2001 8:28 AM
I posted this over on the components board and got only one response. I'm reposting here in hopes of getting some different angles:

I have an older Klein MTB with an integrated BB. It has a square spindle. Here's the problem: I need to put a new crankset on there and I can't find a decent MTB crankset that's not splined.
Is it possible to change out the BB?

If not, is there such a thing as an adaptor so I can fit splined cranks on there?

Would a Campy triple work?

Anyone have any other suggestions? Thanks.

GWilliams responded (thank you) to point number one saying he had heard of a company in Germany that makes an adapter, but could not find any info on it. Anyone?
re: BB dilemma revisitedVaMootsman
Jun 21, 2001 10:03 AM
Several things: I find it hard to believe you can't find a decent square tapered crank. I've never seen/heard of some sort of square/splined adaptor...and if I did, I'd be mighty leary of it. That sounds like a total band-aid fix. You can replace those bearings/bb, but it may take a wrench in a shop hours to dig through the old parts bin. Which brings up the last point: that bike has to be 10-15 years old? Perhaps time to put it to pasture and get a new rig.
re: Campy Triple not compatable with Shimano BBKevin M
Jun 21, 2001 12:08 PM
I'm assuming the current BB is Shimano. You brought up a good question with the Campy. I just looked around (since I have both Shimano and Campy bikes). Evidently they both have the same taper, but the cross sections are different sizes.

The following link has a tech note on the bottom giving the details.

http://www.bikeusa.com/components/bottombrackets/bottombracket2.htm#c
Check out Supergo.comgrz mnky
Jun 21, 2001 1:14 PM
They have FSA and some other brand that offers road cranks with square tapers.

An adapter would be tricky to pull off, but I could see it being entirely possible to go from a sqaure taper BB spindle to a spline, but not the other way around due to Q factor.