Join Date: Apr 2009
Location: New Rochelle, NY
Bikes: too many bikes from 1967 10s (5x2)Frejus to a Sumitomo Ti/Chorus aluminum 10s (10x2), plus one non-susp mtn bike I use as my commuter
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Even if a QR is adjusted well, there can be slippage if the axle cannot bite into the frame (friction alone isn't enough). If you look at any of the better hubs, especially from the horizontal dropout era, they were all made so the locknut was serrated, or were concave leaving only a thin circular rim (foot), which could cut into the frame.
It's the quality of the dentation of these older designs that made them hold so well, but later on people started using softer materials on axles, while at the same time dropouts got harder, and many hubs today cannot hold securely enough against high chain tension. Many blame the Alloy headed external cam skewers of the eras, and these didn't help but it's the failure of the axle to bite that's the issue.
Usually when I hear of slippage, I see a frame with nice pretty dropouts, whereas the dropouts on top of the line older bikes like they were used as pull toys for a pit bull.
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