As Commander Vyper said, Hotwheels bikes are pretty good for 28mm minis:
If you've got any problems locating them I might have some about somewhere.
Regards
PM
Just won an auction on ebay for this nice bike, problem is the auction was for 8 of them and they are all excactly the same. Maybe I keep 2 of them but I am looking for someone that wants one too, if you live in europe I will ask only 7,50 euro for one including shipping.
PM, who makes those bikers the one with the beer bellie looks great on that motorcycle