G'day all. Thinking of a 21" front wheel on a 107 M8 Street Glide. Any thoughts/experience?

If you are going to put a 21 inch front wheel on it that makes sense because the big wheels do not go as far down into potholes and make for a better ride. HOWEVER  do not put one of the silly narrow "pizza cutter" rims on the front. Get a rim that takes a 120mm or 130mm wide trye and you will live happily ever after and women will throw their underpants at you each time you go for a ride. It's a Win Win option.

Cheers for that mate. Yep, was definitely going with the stock width tyre. Now I just have to figure out what to do with all the leftover women.