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So I've just got these fancy expensive cranks with a 30mm alloy spindle which I will be installing shortly on my MTB.
I'm wondering if it makes sense to try and fix the spindle and bearing race together with some medium strength bearing retaining compound so there isn't movement which may wear down the spindle over time. The cranks do have have a preload thingie to manage the lateral movement, but then again so do all Shimano hollowtech2 cranks and I notice those spindles get polished at the bearing interface over time and they're steel.
Was wondering if anybody has tried anything like this? Silly idea? Not going to work?
Id not do that. If you stick the bearing to the spindle how will you remove it when you need to change the bearings. On all my bikes I notice that slight marking on the spindle, but it never amounts to enough to cause an issue. The bearings are a tight fit, you would have to ride the bike for decades to create an issue.