Hi Wilin88,
If you go to a tyre size comparison web site there are plenty to choose from (
Tire Size Calculator ) this is the link for the one I use, this lets you figure out all the critical dimensions. From what I can see the tyre size you suggest is 25mm bigger in diameter than the 19 inch ones I presently have on my RRS. personally I prefer to stick to the more commercial tyre sizes purely for the ride quality and cost reasons. I have picked up two sets (5) of 19 inch RRS V8 rims for $400 and $500 respectively with near new tyres on them all. Certainly beats the $350 / $400 I was quoted to replace the 20 inch tyres alone.
The bigger the side wall the better the ride, I sold my 20 inch rims and went back to 19's, no regrets here. I can't see the tyre size you suggest being a problem based on looking at my 19 inch rims and tyres which are 25mm less in
diameter 12 mm in radius.
Cheers Marty
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