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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.
Polygon-
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_
yea from about 25-35psi (this on a 30mm outer, 25mm inner rim). it does mute it somewhat but at 25psi in hard cornering the tire definitely does start to collapse a bit. if this is it i think it is pretty frustrating. no such problems with 25-45mm 700c tires