The beauty of dual sport bikes like the Honda CRF450L/RL is that it can be two bikes in one... with the stock knobbies, you have a very capable off-road and dual sport bike, and by adding a set of 17" supermoto wheels and tires, you can also have a capable corner carver for the street or kart track.
Converting a Honda CRF450L/RL to a supermoto is pretty straightforward. All you really need is a set of 17" supermoto wheels like the ones we use from Warp 9 Racing, and then some sticky supermoto tires like the Dunlops or Avons we use (see details below). There are a few things you need to do to fit the smaller 17" wheels/tires. Up front, in order to clear the smaller 17" supermoto tire, you have to re-route the front brake line to the outside of the fork leg and also trim the plastic lower fork protectors so they clear the front tire. One bonus with the 450L.... you won't need to source a shorter kickstand like you do on most supermoto conversions, to accomodate the 17" wheels/tires... the stock CRF450L/RL kickstand seems to work just fine.
As for a rear sprocket, the gearing you choose is a personal preference type of thing, but on our bike we initially went with a 50T rear sprocket on our SM project bike, but have since switched to a 46T sprocket and like that much better. On another one of our CRF450L SM project bikes, we did a 44T rear and really like that as well..
Honda CRF450L / CRF450RL Supermoto Wheels:
We use Warp 9 Supermoto wheels on all of our supermoto conversions. Their wheels are available in a lot of different color combinations, and they will include a rear sprocket as well as front/rear brake rotors. They offer spoked wheels requiring tubes, and also now a new tubeless spoked version. There is also a forged aluminum mag style tubeless wheelset available...
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