well i put on some michelin 700 x 23 tyres on by road bike only to find that there was a cut in the side wall of the rear tyre so ive changed back to a 700 x 25 now my problem is im having difficulty taking the 700 x 23 tyre of my front wheel so now ive got a 700 x25 at the back and a 700 x 23 at the front will this have any effect on the way the bike rides and does anyone now a way of taking a tight tyre off ive already broken two tyre levers on it