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Stronglite/Tange BB compatibility

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Stronglite/Tange BB compatibility

Old 09-26-19, 05:52 PM
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motogeek
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Stronglite/Tange BB compatibility

My '75 (I believe) Motobecane Grand Jubile is finally in queue for a build up. My concerns are with the BB. It came with Tange English threaded cups in an English threaded BB. The crankset I want to use is a Stronglite 93. Am I going to run into compatibility issues using the Stronglite axle (which came in a French bike) in the Tange cups? Is it just a matter of dropping in bearings and grease, screw the cups in and go or is there some other issue I need to be aware of.
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Old 09-26-19, 05:56 PM
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I doubt the Tange cups in your 1975 Motobecane are english threaded. That bike is likely French threaded; I believe some of the later Motobecanes were Swiss threaded.

If the cups and spindle are good, I'd give the 93 a shot and see how it works.

There is a chance this might work. Here is some useful information on this

https://www.sheldonbrown.com/bbtaper.html

Brown's site says that older Stronglight cranks are ISO standard; Jan Heine says they're JIS,

https://janheine.wordpress.com/2013/...s-demystified/

Last edited by bikemig; 09-26-19 at 06:01 PM.
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Old 09-26-19, 06:54 PM
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After further investigation, cross checking the markings on the fixed cup vs. Sutherlands manual the BB is, indeed, Swiss threaded. The axle appears to be ISO. I think tomorrow I'll try to install the axle and bearings to see how it fits.
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Old 09-27-19, 01:52 AM
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I tried to install a Stronglight 93 double 54/44 onto a 110mm spindle width and was touching the dimpled chainstay. So make sure the spindle length is not less than 113mm for starters.
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Old 09-27-19, 05:57 AM
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You are aware of the “thin cup” issue with the Stronglight 93?

french bottom brackets have “thin cup” walls and thus the spacing between races on the spindle are wider than std English cups (56mm vs 52mm).

I dont one know where your combo fits in but when installing and the adjustable cup sticks out too far, you have an issue.

Std french spindle for a Stronglight 93 double is 118 mm
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Old 09-27-19, 08:43 AM
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Originally Posted by bikemig View Post

Brown's site says that older Stronglight cranks are ISO standard; Jan Heine says they're JIS,

https://janheine.wordpress.com/2013/...s-demystified/
Technically, they are neither ISO nor JIS, as those standards weren't used in the 70s (or 80s).

Nevertheless, they are pretty much JIS. I was confused about this once too, and have subsequently measured and compared carefully with a couple different Stronglight cranks, and several JIS BB. JIS tapers are just a tiny hair fatter at the end, but close enough. Stronglight alloy is rather soft and the tapers tend to enlarge over time very slightly if taken on and off for maintenance. Therefore the very slightly fatter JIS spindles work out nicely for modern times.
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Old 09-27-19, 09:07 AM
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Originally Posted by Salamandrine View Post
Technically, they are neither ISO nor JIS, as those standards weren't used in the 70s (or 80s).

Nevertheless, they are pretty much JIS. I was confused about this once too, and have subsequently measured and compared carefully with a couple different Stronglight cranks, and several JIS BB. JIS tapers are just a tiny hair fatter at the end, but close enough. Stronglight alloy is rather soft and the tapers tend to enlarge over time very slightly if taken on and off for maintenance. Therefore the very slightly fatter JIS spindles work out nicely for modern times.
They are a bit soft and they're old. I have a stronglight 99 that's bottomed out on a 118 length spindle that I'll need to do something about.
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Old 09-27-19, 09:54 AM
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The Stronglight taper from the mod.93 days was very close to ISO in it's across-flats dimensions. JIS taper will kick out each arm approximately 2mm further than on a Stronglight or ISO taper.

That said, I've run the 93's on a Shimano 113mm symmetrical cartridge bb and it has worked well for over five years now.
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Old 09-27-19, 02:32 PM
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Originally Posted by bikemig View Post
They are a bit soft and they're old. I have a stronglight 99 that's bottomed out on a 118 length spindle that I'll need to do something about.
Which way is it bottomed out? Could you remove a little material from the ends of the spindle?
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Old 09-27-19, 02:35 PM
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Originally Posted by ThermionicScott View Post
Which way is it bottomed out? Could you remove a little material from the ends of the spindle?
I'll gladly send the bike over to Cedar Rapids if you have the skill set to do the job.
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Old 09-27-19, 02:55 PM
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Originally Posted by bikemig View Post
I'll gladly send the bike over to Cedar Rapids if you have the skill set to do the job.
Be careful with that offer. We ride the same size bikes.
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Old 09-27-19, 02:59 PM
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Originally Posted by ThermionicScott View Post
Be careful with that offer. We ride the same size bikes.
Hah, well maybe I'll just do my own wrenching.
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Old 09-27-19, 09:14 PM
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I like the spindle-shortening trick, it restores the fit, the chainline gets slightly better, and the grinding can be done on the still-installed spindle.
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