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1986 PX-10 Bottom Bracket Specs Needed

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1986 PX-10 Bottom Bracket Specs Needed

Old 09-16-21, 04:25 PM
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1986 PX-10 Bottom Bracket Specs Needed - Solved

OK... Been going around and around on this. I have what I believe is a 1986 Columbus Tubing PX-10 Frame that I want to fit out with a sealed bottom bracket. Its 68mm and on inspection has an English Thread @ 24G with the Fixed threaded left. So I am assuming I can just order an English square taper 68mm sealed bottom bracket at 120mm. I am going to use a double compact crank. Did the original PX-10 come with 110mm, 120mm, or 125mm spindle length? I have been searching for the specs but cannot find them.
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Old 09-16-21, 04:50 PM
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What matters is the BB length the new crank you choose to use requires or recommends.
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Old 09-16-21, 05:41 PM
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Originally Posted by dedhed
What matters is the BB length...
Thanks - The bottom bracket length is 68mm. I am seeking the spindle length of the original 86 PX-10 that went into the 68mm bottom bracket.
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Old 09-16-21, 05:51 PM
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Originally Posted by zandoval
Thanks - The bottom bracket length is 68mm. I am seeking the spindle length of the original 86 PX-10 that went into the 68mm bottom bracket.
No, the shell width is 68mm.
The length of the spindle is determined by the new crankset you are installing, not the "original length spindle" that was sized for whatever crank was originally on it. If you have the original spindle you can measure it but be aware that it is likely asymmetrical meaning one side is longer than the other and a cartridge is symmetrical.

You're installing a new compact crank, not the original crank, on a new cartridge BB, so you purchase the length required for your new compact crank regardless of what was "original" which has no bearing on what your new crank requires. .
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Old 09-16-21, 07:04 PM
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Originally Posted by dedhed
No, the shell width is 68mm... The length of the spindle is determined by the new crankset you are installing, not the "original length spindle"...
OK! Got It! - Thank you.
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Old 09-16-21, 07:31 PM
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Originally Posted by zandoval
OK! Got It! - Thank you.
Just as an example this shimano 6500 9 speed ultegra crankset requires a 109.5mm for a double to get the recommended 43.5mm chainline and 118.5mm for the 6503 triple to hit the 45mm chainline.
https://si.shimano.com/pdfs/si/SI-16T0B-000-ENG.pdf


Given the 1986 age you should also check your rear spacing as depending on what "speed" rear you plan to run it as may need respacing. 6-7 speed original it may may be 126mm spaced and 8/9/10 or more requires 130mm spaced rear wheel or it's in that transition and spaced 128 so you can run either. .These are all things (among others) that need to be known and taken into account when building up older frames with newer drive train. Your lucky it's new enough you shouldn't need to worry about French idiosyncrasies like threading and stem sizes, but should verify.

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Old 09-16-21, 10:40 PM
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Originally Posted by dedhed
...lucky it's new enough you shouldn't need to worry about French idiosyncrasies like threading and stem sizes...
Yep... On the older French bikes those idiosyncrasies have been fun. On the older bikes I have worked on there were usually enough remnants of the original bottom bracket to line things up. Also when converting over from Cottered cranks I would use the 5SB spindle that allowed me to use the original thin French cups with loose balls. I actually did not expect this 86 PX-10 to have English threading. I know that it originally listed using a Square Taper Mavic Double Crank. I really don't know what the specs were on the bottom bracket. I am going to use a 6 Speed Shimano Touring Freewheel 14-34 with 125mm at the drops. So I am going to go with a Square Taper JIS 68mm Sealed Bottom Bracket with a Spindel length @ 118-120mm. That should work with just about any Generic crank without much difficulty.

I should also note that this is not a restoration. I just want to make use of a dam good frame...
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