yea, I was afraid of friction as well. Luckily, the tires only rub for short periods of time (a second max), so any damage will be limited to the inside of the fender lip, which you can't see anyway...

A quick question though, can you buy the 23mm pads for the front? I checked on fastlane, and they only have up to 3 bump. I figure id buy 2 and 3 bump pads and try them out to see where I can get the right match. 4 bump pads would be good to try out too, but I can't seem to find any.