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my current rear wheel is a 18 x 2.15. im thinking of putting a Avon roadrider 110/90v18 on it.
if i was to use an 18 x 2.15 on the front with a slightly smaller tyre, maybe 100/90v18. how do we think this will handle?
I'm currently setting up the front end using the cognito moto gsxr spoked wheel conversion hub.
OR
fork out for fatter wheels front and rear like they (cognito moto) do!
3.25x17(F) 4.25X17(R) would be what I'm running albeit I have an R6 front end and FZ6 swingarm... To keep in line with the chain you might have to run a narrower back rim/tire setup if so maybe drop off the front to 3.0 and as wide as you can in back... none of this is going to improve performance on your bike BTW... it will stop better and look the part, but no faster no better handling, gonna turn harder not easier but will lean in deeper so in that respect the tires will make some improvement over whats available in skinny tires for a good price, but if you only eat chicken strips from McDonalds you won't need to concern yourself with any of this 8)
Really though the way you are setting up the bike an 18 would work, but 17-17 is the standard.
Front rim size will have an impact on turn in regardless if you have an 18 or 17 measuring equal from the ground to the top of the tire by increasing/decreasing profile. I would suggest you talk to Devin at Cognito or someone who is making up the hubs or even Buchanan Spoke to get some feedback from people running his product. In the end 18 or 17 yes, you need a wheel tire setup that is as mathematically correct as well as "cool factor" .
I'm running the exact same 18 inch rim front and rear (2.15 maybe? Stock XS650 rear rims) and run a 100/90 front and 110/90 rear. In hindsight I'd choose a 90 front if I did it again to lighten up the handling and will replace the tires soon enough as they're 5 years old now.
Don't go too fat unless you're just doing it for looks and won't be riding the bike aggressively.
Putting a wide rim on with a smaller tire will take crown out of the tire and make it slower on turn in. Going big with front tires makes the front end carry more tire weight which will slow handling.
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