I have a TS PC Racer and I've tested 2 rims. One is 32 cm and weights only 850 gr. The other one is 33 cm and has button plate attached with a resulting weight of 1.2 kg. I don't know if it's a subjective impression, but I think the larger and heavier one turns a bit more slowly and reacts with some delay. As regards effects, I have not noticed much differences, but I must say I'm not too sensitive in that sense. Could it be that the increase weight adds some inertia and that's why I feel it a bit sluggish. Do you think that weight is more crucial than the rim's diameter or viceversa? Have you noticed differences between rims of difference sizes and weights when using more powerful systems such as OSWs?