Originally Posted by
dddd
Those stops are never easy to position precisely on both sides, so a single one is about as good as two imo.
I don't mind pushing the rim over a little with one knee while tightening the axle. Just keep some downward force on the saddle while the axle is tightened so the axle settles up consistently against the top side of the dropout slots and the rim thus centers between the brake pads.
If your bike has a claw-type derailer hanger, then no stop is needed (and left side optional).
I think that most people here understand how to center a wheel.
If you use two of these (or one with a claw), you just pull the wheel back against the stops and the wheel is centered perfectly every time, even in the dark ( or when you don't have your glasses, a new issue for me). I have them on all four of my French bikes because they came with them. I also have them on a mountain bike with a chain stay brake and horizontal dropouts. With those you not only have to center the wheel between the stays, but the brake pads have to meet the rims at the right location. It's a bit of a hassle without those stops, but no problem at all with them.
Never easy to position precisely? I don't get that at all.