The none drive side seems to say “strong light” worn out.
I also these seem to be asymmetrical? The crank arm isnt in the middle between the two arms on the spider. The crank arm actually almost goes over a chainring bolt itself.
Was this done intentionally for some kind of benefit or?
by Caramel_Pineapple
6 Comments
Stronglite
I used to see these in the shop on european builds
[https://www.ebykr.com/stronglight-eyes-on-future/](https://www.ebykr.com/stronglight-eyes-on-future/)
it’s a Stronglight 103, visible in the 1984 Stronglight catalogue : https://labibleduvelocataloguesstronlight.blogspot.com/p/stronlight-1984.html
It lines up so crank is 90 degrees from the spoke/symmetrical axis. This is where crank force is at a maximum so stress on spider and chainring will also be max.
Crank designs are mostly aesthetic. The bike frame is what does most of the flexing.
That arm certainly would be stiffer than a regular one, but the chainring is less than half the thickness of the arm. Most of the minimal flexion that does occur will happen between the chainring bolt and the teeth. A normal crank arm is very stiff.
Later designs from other manufacturers put the bolt thing reversed behind the arm and it’s a bitch. I would rather use a 4x BCD than those. This is refreshing