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@gbj_tester
Definitely BS, the chain tension compresses the stays, doesn't matter if it's the top run or the bottom run of the chain as the compression always goes along the axis from wheel axle to BB spindle, with the moments taken up by pedal pressure and tyre traction. If anything, the load is less when braking, because the traction is subtracted from the drive reaction, rather than being added to it as is the case under acceleration.