Without seeing the two in front of me, I can't say for sure. Most likely the bolt pattern where the sprocket bolts into the wheel. Most aftermarket wheels are for Harleys, lets say. You could use a stock harley wheel, sprocket and brake disc setup(Big bucks) because I don't think you could bolt a triumph sprocket to a harley rim. You would have to use the Harley rotors as well. But if the rotor is any larger or smaller than the stock Triumph rotor, you screwed as well. Even a tiny bit off would throw off the precision of the brake setup. I am mainly speaking of the rear wheel setup. The front wheel setup would be easier to do. You can get yourself a set of Harley 41mm fork tubes and lowers. There are a ton on ebay and all for under $100. Then you would have to use the harley rotor and caliper that bolts to the fork lowers. Once this is complete you can use any custom front wheel made for a Harley. The rear wheel would be the more difficult of the two to convert.
Fryguy
