Hi all. I got back into biking last year and bought a Trek 7100. I cannot afford to buy a new bike but I would like to upgrade the tires to go a little faster. I still have the standard Bontrager 700 x 35s on the bike. Am I able to go down to 700 x 32s? And will that really make that much difference? I do plan on buying slicks. Thanks for your help!