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@Emyr
Does anyone apart from Surly use 7k-series angular thrust bearings in 135-spaced SS/Fixed hubs?
I'm finding the 6ks in my Echo TR hubs get sloppy quickly: not terminal play but if it was loose bearings I'd adjust the cones. This is with the wheel firmly secured in the dropouts so the inner casing is pinched between ridges on the axle and the sleeves which fill the space to the dropout. I think the movement is within the bearing, rather than the outer casing moving in the hub body as it's all in line with the axle.