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yea reasonably. not like they are compass though. i haven't had this problem with any 700c wheel/tires but aside from briefly using a schwalbe thunder burt 2.1" i haven't tried anything else in 650b. i didn't ride the burts long enough or aggressively enough on pavement to notice.
having read some more about wheel flop that does sound like what this feels like. strange though that it isn't a problem with the other wheel/tires. seems like flop is around 20mm which seems reasonable?
zmjones_-
It could be that the smaller 650b is resulting is less trail accentuating the flop. I'm not fully clued up on how one affects the other though. I have a touch too much flop on my conversion, it self steers a bit too much on sharp corners, but that's because the fork is a bit too long for the frame and the headangle is already slightly slack. It equates to a decent ride as long as you're used to it and don't suddenly slam it in to corners.
I guess trail (more=more straight line stability) balances flop (more= more power steering effect) and we're both a bit too far in to the flop direction. This can be a desirable effect but it sounds like it's a bit too much on your bike for the style of riding you're doing, as I say I'm no expert and I'm not even sure how pneumatic trail plays in to this (or whether it is even real!).
Paging @edscoble
Polygon
Those are pretty thin walled tyres though aren't they? My first reaction is it sounds like wheel flop from too long a fork, but maybe not if it's fine with other tyres.