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Old 04-10-10, 09:43 AM
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Cup & Cone BB to Sealed Cartridge BB


Hello all, I have a Panasonic 1988 DX 4000 (original 105 groupset) and want to replace cup and cone BB (due to pitting in the spindle) to a sealed cartridge BB. I have found the component group on velobase at:

So, it appears to me the correct size cartridge BB would be 107mm x 68mm w/ JIS taper from looking at the crankset...but when I look at the BB shown with this group, the measurements are different (115mm x 70mm). One last thing, my spindle has male threading on each end (i.e. no crank bolt, just a nut that screws on instead) which is also different from the spindle shown on velobase.

This is my first attempt at anything like this, can I get a second opinion on which size to use? I assume it is the 68mm x 107mm since 70mm is an odd size. Should I just open up the BB and measure, and if so, can I get a few pointers on how to measure?



Last edited by charlie_murphy; 04-10-10 at 09:47 AM. Reason: WHOOPS MISCATEGORIZED...
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