Originally Posted by
Grand Bois
It's strange that I've had a completely different experience for the last forty years. I have never had to readjust them because they don't move. I prefer them to "premium adjusters" because they're not so easily damaged.
They're not really adjusters, they're spacers. Putting them all the way back positions the wheel perfectly in Simplex dropouts. The is absolutely no tendency for them to move forward. It's the same for the Suntour dropouts on my Japanese Peugeot.
They may not work well in stamped dropouts. I've never tried.
I've never had a QR contact them. Not even close.
I think you made a good observation that when these parts are used in fully-aligned (front-to-rear, as affects wheel position) dropouts, there is no space for either spacer/stop to move rearward out of adjustment.
But when a claw hanger is perhaps in place on one side, or when the dropouts have some fore-aft misalignment at the rearmost end of the slots, or when the rider perhaps wants their axle as far forward as practical, those are the cases where a precisely positioned axle stop spacer may later move rearward and thus out of "adjustment" over time.
Mountaindave 's experience with these spacer stops interfering with the axle and QR gripping the dropout sounds like it could be related to the situation I mentioned in my earlier post, i.e. that some QR heads and nuts (and/or the axle locknuts) can in some cases have an OD that allows the toothed grip ring area to perch upon the axle stop spacer before it begins gripping the dropout, which could of course compromise the grip on the dropout. or may at the least not allow the axle itself to slide quite fully against the concave "tip" of the spacer stop.