grinding material off the axle to start vertical play like the Hollowtechs did.
That’s interesting, I hadn’t heard of that mode of failure before with hollowtechs.
I've seen it, but only where the bb has been so neglected that the bearing has seized and the crank spindle starts to spin within the bearing.
Same; this happened to my partner’s old bike that hadn’t been looked at for years. BB and cranks trashed.
@M_V started
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That’s interesting, I hadn’t heard of that mode of failure before with hollowtechs.