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Shimano recall | 2.8 million cranks affected globally
(www.bikeradar.com)
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this post was submitted on 22 Sep 2023
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bonding issue? They're just glued together?
How did this get through design? Surely someone must have noticed the assembly, unless people assumed it was going to be welded?
Shimano has been making hollow crank arms this way for years. It works well if it's done right. All carbon frames and components are simply glued together, too.
For kicks, here's a nice cross-section of a crank arm from ~~a different BikeRadar article~~ handsonbike.blogspot.com: