Stronglight 80 crank tapers

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mattsccm
Posts: 5101
Joined: 28 Nov 2009, 9:44pm

Stronglight 80 crank tapers

Post by mattsccm »

Have picked up the above crank. Can't remember, from my last ownership of one, if they are JIS or ISO? I know older Stronglights are ISO butnot sure where the 80 stands in the way of things.
Jdsk
Posts: 24639
Joined: 5 Mar 2019, 5:42pm

Re: Stronglight 80 crank tapers

Post by Jdsk »

VeloBase has ISO:
https://www.velobase.com/ViewComponent. ... 847f2bc22b

Jonathan

PS: An assertion of JIS in another thread!
viewtopic.php?t=13922
mattsccm
Posts: 5101
Joined: 28 Nov 2009, 9:44pm

Re: Stronglight 80 crank tapers

Post by mattsccm »

My point exactly!
jimlews
Posts: 1476
Joined: 11 Jun 2015, 8:36pm
Location: Not the end of the world.

Re: Stronglight 80 crank tapers

Post by jimlews »

FWIW
My understanding is that the Japanese adopted the French taper when they set their standards.
So,
Stronglight=French=JIS
TheBomber
Posts: 525
Joined: 16 Feb 2020, 8:18pm

Re: Stronglight 80 crank tapers

Post by TheBomber »

Is the angle of the taper any different between JIS and ISO? Or is it just the length? If the angle is the same then you could just try them on whatever BB you have to hand, checking to see whether the bolt bottoms out on the spindle/not enough of the crank is supported by the spindle. No doubt Brucey has advised on this topic in the past for those good with the search function.
Jdsk
Posts: 24639
Joined: 5 Mar 2019, 5:42pm

Re: Stronglight 80 crank tapers

Post by Jdsk »

TheBomber wrote: 2 Jul 2022, 5:58pm Is the angle of the taper any different between JIS and ISO? Or is it just the length? If the angle is the same then you could just try them on whatever BB you have to hand, checking to see whether the bolt bottoms out on the spindle/not enough of the crank is supported by the spindle.
...
Sheldon Brown (and friend) on precisely this:

"Square Taper Bottom Bracket Interchangeability":
https://sheldonbrown.com/bbtaper.html

Jonathan
Jdsk
Posts: 24639
Joined: 5 Mar 2019, 5:42pm

Re: Stronglight 80 crank tapers

Post by Jdsk »

TheBomber wrote: 2 Jul 2022, 5:58pm Is the angle of the taper any different between JIS and ISO? Or is it just the length? If the angle is the same then you could just try them on whatever BB you have to hand, checking to see whether the bolt bottoms out on the spindle/not enough of the crank is supported by the spindle. No doubt Brucey has advised on this topic in the past for those good with the search function.
Brucey's observations:
viewtopic.php?p=1509209#p1509209

Jonathan
TheBomber
Posts: 525
Joined: 16 Feb 2020, 8:18pm

Re: Stronglight 80 crank tapers

Post by TheBomber »

Jdsk wrote: 2 Jul 2022, 6:03pm Brucey's observations:
viewtopic.php?p=1509209#p1509209
Not sure I could fully follow that, but Sheldon’s page made sense to me. Thanks for the searches.
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