Need RIM/Tire Help

[XS Man]

I have a 18x2.5 Rim for the rear.. Whats the biggest tire I can throw back there? It had previously a 16 inch with a 130/90/16? The front Rim is a 18x1.75.. Need the same info... Help me out.. I used the search engine but everyone is different!!!

 

[Big R]

Do a google search for Avon tyres - once you find their home page, search it for some kind of tyre / wheel chart. It will show you what size tyres can go on your wheels.

And FYI, rims go on cars, wheels go on bikes.

 

[baconpocket]

you're gonna wanna consider what will actually fit the wheel as well as the outer dimensions of the tire for chain/frame contact issues. for width it is a safe bet to increase by 10mm if needed and i would try to keep overall diameter within 5%.

i used this site for the wheel side of the equation http://www.dropbears.com/u/utilities/tyrerim.htm.
simple math will help you figure out the other consideration.

 

[crazypj]

Are you using numbers on rim or did you measure it?
2.50 is WM4, not normal unless it's been re-built?
1.75 doesn't match anything?
WM1 is 1.60"
WM2 is 1.85"
WM3 is 2.15"

 

[XS Man]

Are you using numbers on rim or did you measure it?
2.50 is WM4, not normal unless it's been re-built?
1.75 doesn't match anything?
WM1 is 1.60"
WM2 is 1.85"
WM3 is 2.15"

I am rebuidling the rear wheel with a 2.5 and the front is a 1.85!

 

[crazypj]

I am rebuidling the rear wheel with a 2.5 and the front is a 1.85!

Cool, someone doing it 'right' 8)
I would probably go with a WM3 front to match WM4 rear.
Is it on XS650? ( I have a little experience with them ;D)
probably wouldn't go wider then a 90/90 with WM2 but you can fit a 120 or 130 with WM4.
140 will fit but wears out real fast because beads are 'pinched' (I tried it with a Dunlop, got around 2,000 miles plus it didn't handle very well)