I've just read on an Australian cycle forum about a woman's racing team which had 700x28c tyres on the rear and 700x23c tyres on the front. The reason given was that there is more weight on the rear tyre and it would therefore be more comfortable & grip better, and it didn't matter what size the front tyre was as you only used it for steering. I thought this sounded like a good idea as I have never read anything that says both front & rear tyres have to be the same width (on my motorcycle the rear is wider than the front). It would also make my front wheel easier to take off without deflating it - presently it is 28c and if I pull it out without deflating it, I pull the brake blocks out too. Does anyone have any arguments for or against having different sized tyres and what the benefits would be either way?