[QUOTE="Ace"] completely >> > wrong, but I've seen pictures of bikes with single sided swing arms, >> > and the brake disk has been carefully put right into the centre >> > line of the rear wheel. Right, yeah. That's quite common, found on almost any derailleur-geared pushbike, but is more to do with weight distribution then alignment of braking (or accelerating) forces.[/QUOTE] I know not the reasons why, so "wibble". [QUOTE] In any event, it doesn't put the disk "in-line" with the wheel itself, as that would require a one-sided dish effect, leading to immediate wheel collapse.[/QUOTE] Actually, that's exactly what it does do, unless I'm misunderstanding what you mean. The 'outside' face of the wheel centre is roughly level with the right-hand edge of the rim, & the spokes curl inwards to connect to the centre of the rim, iyswim. sort of like a car wheel I s'pose.