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#1
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Facing tolerance for BB
About how much could a 68mm bottom bracket shell be reduced in width by
facing operations before one might need to use a spacer to compensate for the material removed? I've got a new frame whose shell was faced once and is now 66.5 - 67mm wide. Cal |
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#2
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Facing tolerance for BB
On Fri, 4 Nov 2005 21:49:20 -0800, "CEarly" wrote:
About how much could a 68mm bottom bracket shell be reduced in width by facing operations before one might need to use a spacer to compensate for the material removed? I've got a new frame whose shell was faced once and is now 66.5 - 67mm wide. Depends on the BB. But that sounds low. Jasper |
#3
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Facing tolerance for BB
The consequence of having a BB shell slightly less than 68mm wide is usually
only that more thread sticks out of the frame on the non-drive side BB cup. Unless the way that looks bothers you, there's probably no need to do anything about it. |
#4
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Facing tolerance for BB
CEarly wrote: About how much could a 68mm bottom bracket shell be reduced in width by facing operations before one might need to use a spacer to compensate for the material removed? I've got a new frame whose shell was faced once and is now 66.5 - 67mm wide. I suppose it depends upon how important a straight chainline is to you. It would be more important on a fixed gear bike than on a geared bike. If the shell was machined evenly on both sides, just split the difference and get a spacer that matches. My '80's Schwinn Peloton's shell was faced down to about 64.5mm. I am running a Shimano UN53 cartridge bottom bracket with a 2mm spacer on the drive side. This works great, does not creak, and produces a straight chainline. (bike is a fixed gear) I stuck an old Sugino lockring on the plastic nut on the non-drive side to make it look presentable. |
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