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Bottom Bracket Asemblly(7 posts)

Bottom Bracket Asembllyroadcycle
Dec 8, 2001 1:45 AM

On my 2001 road bike with ultegra components, the bottom bracket is installed with two metall rings (washers) between its right cup and the frame threads.
This is how the LBS originally assembled it.
Didn't see this kind of assembly on other bikes of the same brand & model.
Any one has any idea why it is assembled like that ?
Could it it be an LBS improvized sollution for hiding a thread problem on the frame or the bottom bracket ?
Any oppinions from those who encauntered the same problem will be much appreciated.

Sound like chain lineDave Hickey
Dec 8, 2001 4:51 AM
It sound like your LBS put the washers in to adjust the chain line. When they were building up your bike, it probably wasn't shifting correct and they intalled washers on the BB to move the chainrings over a couple of mm.
Sound like chain lineroadcycle
Dec 8, 2001 6:31 AM
Thanks Dave,

I'd like to ask fore more details :
It's not clear why on other identical bikes there are no washers on the bottom bracket & frame assembly.
How common is chain line adjustment ?
Also what can be the cause for needing chainline adjustment:
components problems or improper frame or components match & allignment ?
Again will aprecciate oppinions on that.

Sound like chain lineDave Hickey
Dec 8, 2001 8:26 AM
I could be alot of things. I had a frame the kept dropping the chain everytime it shifted from the large to small chainring. No adjustment would work until I intalled washers. What type of frame is it?
Sound like chain lineroadcycle
Dec 8, 2001 12:48 PM
Thanks again Dave,
To your question - it's a klein quantum race.
had to do the same thingTerry Brownell
Dec 8, 2001 6:36 PM
on an older Calfee frame in order to use a splined Ultegra BB. The old style 4-sided Ultegra spindle was a few mm longer and the fit was fine with that design. Without the spacers,the small chain ring rubbed on the seat stay.
Me toonee Spoke Wrench
Dec 8, 2001 7:11 PM
I have a Quantum Race. My chain used to rub the big chain ring whenever I was in the little ring and any of the smallest three cogs. A 2mm spacer to move the bottom bracket over helped a lot. I wish that Shimano made more spindle lengths for the splined bottom brackets.