I was thinking about using a 26 inch rear wheel and 2 inch tire with a 700c or 27 inch front wheel and 1 3/8 inch tire or similar kind of combination, just to get that kind of dragracer look going. I know I've seen more than one bike on here with mismatched wheels and/or tires... who's got one that worked out well they want to show off, or maybe one gone bad to show as a cautionary tale?