while in the past I always used 23's, I've gained way too much weight for them (by my understanding anyway, back in the day I was sub-135; now I'm... "a bit more").

one question I have that never really occurred to me in the past: what's the advantage of 23s over 25s? my understanding is that 25s generate less rolling resistance, are 23s preferable for the light cyclist because they weigh less (and therefore have less rolling weight)???