track chainline q'n

Hi all, I have a new Miche track bottom bracket (107 ISO) to match a set of miche track cranks. The
BB is a cartridge style, with the two floating end cups that screw into the frame. (ie is similar to
a shimano ultegra BB). However unlike a road bottom bracket, there isn't a 'lip' on the RH side end
cup to limit how far it can be screwed into the frame. Can anyone tell me the best way to obtain the
correct chainline with this infinitely adjustable bottom bracket? Am I supposed to screw the RH side
in flush with the frame, or iteratively put the bb in, measure the chainline somehow, remove cranks,
adjust BB, ..... etc? Cheers Gemma

 

On Tue, 1 Apr 2003 16:51:26 +0930, "Gemma Kernich" <[email protected]> wrote:

>Hi all, I have a new Miche track bottom bracket (107 ISO) to match a set of miche track cranks. The
>BB is a cartridge style, with the two floating end cups that screw into the frame. (ie is similar
>to a shimano ultegra BB). However unlike a road bottom bracket, there isn't a 'lip' on the RH side
>end cup to limit how far it can be screwed into the frame. Can anyone tell me the best way to
>obtain the correct chainline with this infinitely adjustable bottom bracket? Am I supposed to screw
>the RH side in flush with the frame, or iteratively put the bb in, measure the chainline somehow,
>remove cranks, adjust BB, ..... etc?

Start by installing the left and right cups spaced equidistantly from the respective faces of the
bottom bracket shell (same number of threads exposed [or recessed] on both sides). Install the cups
with sufficient torque as if it were the final assembly. Fit the right crank and chainring and
measure the chainline. If it's good, mount the left crank and finish the bike assembly. If there's a
chainline error, remove the right crank, make a compensatory lateral adjustment of the bottom
bracket cups, refit RH crank and remeasure. Repeat as necessary.

John
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Florida 305-273-4440
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