I thought Tim Allen was on a Deuce, or something close to it. The rear fender looked like it was off a deuce, as did the low profile front fender. The only thing is that I don't think he had was a 21" front wheel.
If you watch the making of the end of the movie on the dvd, it has Tim Allen saying that he was riding a FATBOY. It had wheel mods, but I don't know what else.
I like how it poked fun at the demographic harley is marketing to. (most of us). middle aged, first time HD owners. I thought it was funny enough just that it spoofed the conflict between "real bikers" and "weekend warrior harley guys".
I thought that the movie was really a slam on bikers, with comedy thrown in, considering the cast. It put bikers in a bad light as far as I'm concerned. Really could care less about the model of bike that they were ridin'. JMO.