Quote:
Originally Posted by goat67
So your rim width stamped on the rim are 2.15 and 1.6?
I have 2.5 and 1.85 would the 120/90-17 and a 110/80-19 be a good fit for these rims?
Stock sizes are 110-90-17 and 90-90-19
I do not do much if any off road riding so the 705s maybe the best fit.
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I actually couldn't find the stampings on my rims. Not sure if they got covered up with paint or never got stamped. I simply measured them. From the inside of the bead flanges, they are basically 2.15" across (2.20" actual) rear and 1.6 front (1.66 actual)
With a 17x2.5 rear wheel wheel you can definitely run a 120/90-17 or a 120/80 17 without issue. Both are a little different in diameter from your stock size. 120/80-17 is about a third of an inch smaller diameter, the 120/90-17 is about 3/4 of an inch larger in diameter. Obviously both will affect your final drive gearing a little but that can always be adjusted for. You could even go as far as a 130/90-17 if you wanted to witha 2.5" wheel. This is the exact wheel and tire size on my Goldwing (see picture below).
With the front wheel, I would personally not go any wider than a 100 width tire on a 1.85" wheel. Either stick to a 90/90-19 or a 100/80 -19 - which is pretty much the same diameter. A 100/90-19 can also work, but will be about half an inch taller in diameter which will throw off your speedo a little bit.
Just keep in mind that tire dynamics with bikes are sometimes counter intuitive to what you think. Wider tires are not always necessarily better for handling. This video does a pretty good job of explaining what I mean.