I had 'Wheel & Spoke Services' fit a custom 16/4.25 36 spoke Morad rim to my stock hub to replace the stock 15 2.75 rim, and a set of 8/9 Butted stainless steel spokes. By removing the rear foot peg mounts i was able to fit a 170 tyre using the stock spacers. I did however moved the front sprocket spacer from the outside to the inside and used longer bolts on the rear sprocket and spaced out the rear sprocket. I have been advised by professional racers who has done this is you can off set a rim by 4mm before noticing any difference in performance. And this is on racing bikes.
I then did some research and asked a number of bike shops and all agreed that there would be no change in performance. So the rim is off set 4mm toward the chain and that's it folks a 170 fits clean and true but off set 4mm on the hub with no change in performance and safety. I wanted it offset more but the company who did the job would only go to 4mm for safety reasons. I didn't think a 170 would fit, I first ordered a 160 but could see plenty of room for a 170.So the hub is in the same place but the rim 4mm to the left. The only thing that did not fit is the chain guard. And the chain guard mounts needed modifying. The 4mm off set cannot be seen with the naked eye, I understand that the stock tyre sits to one side so maybe the 170 insinuates that more, But I promise you the tyre and rim is only 4mm to the left. It did cost just over $1000.00 including tyre but worth every penny. I DID NOT DO THIS WORK MYSELF,All work was done by professionals in there field and done to a safe standard. I suggest that anyone wanting to do this mod do the same.
Cavi Mike wrote on 10/25/12 at 22:13:05:OK it's probably more like 1/2" but all that matters is it's offset and a 170 doesn't fit. It's abundantly clear that you shouldn't be giving advice on modifying motorcycles let alone judging anyone else.
http://cavimike.com/savagecenter.JPG 
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