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Cup & Cone BB to Sealed Cartridge BB

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Cup & Cone BB to Sealed Cartridge BB

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

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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:
http://velobase.com/ViewSingleGroup....5-51dd364b43c4

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?

Thanks!

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Last edited by charlie_murphy; 04-10-10 at 09:47 AM. Reason: WHOOPS MISCATEGORIZED...
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Old 04-10-10, 10:00 AM
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miamijim
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Charlie,

Although your crankset is 105 your BB is not. You'll find that all 105 BB spindles have female threading as seen in the Velobase pic. Velobase provide an 'overview' of components. Each manufacturer produces a variety of BB sizes to fit different applications. The Velobase example is for an Italian threaded (70) bike requiring a 115mm spindle length. Shimano probably made 10 different sized 105 BB's.
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Old 04-10-10, 10:15 AM
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Cool, that makes complete sense. It seemed more likely that the 68mm measurement was right anyway. I'll probably double check the spindle length when I open the BB, but as a follow up question should I measure my spindle length from beginning of thread-to-beginning of thread or end-to-end, since the cartridge types are female-threaded and my current spindle is male-threaded?
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Old 04-10-10, 11:13 AM
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Originally Posted by charlie_murphy View Post
Cool, that makes complete sense. It seemed more likely that the 68mm measurement was right anyway. I'll probably double check the spindle length when I open the BB, but as a follow up question should I measure my spindle length from beginning of thread-to-beginning of thread or end-to-end, since the cartridge types are female-threaded and my current spindle is male-threaded?
Your bike is 68mm and you'd measure the spindle end to end excluding the threaded studs. The spindle will be marked with tis length.
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Old 04-10-10, 04:20 PM
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So, I picked up a 68x107 cartridge and installed it without issue (rolls better than my old stuff for sure). My spindle was in fact NOT marked with the length when I pulled it out, however it did have some lettering/code on it. If you're curious I can post a link to a picture of the spindle.
Otherwise, thanks for the help, Jim.
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