Topic: Rim and Tire confusion...

[Lumbee]

Hey guys, I have two rims...a 1.85X19 which had a 3.50-19 tire on it, and a 2.15x18 which had a 4.00-18 on it. I would like to put a 110/90-19 and a 120/90-18 on the rims respectively. Will this work? I have looked at all the tire charts via google search and am not sure about the conversions. I am being a cheap bastard and want to buy the tires over the Internet, so no help from the local shop. Any info appreciated. Thanx!

[luap]

http://www.dansmc.com/tirespecs1.htm
3.50 = 100/90 or 100/80 (shorter tire)
4.0 = 110/90 120/80 could also do a 120/90 for the rear
I would guess 100/90 19 an 110/90 or 120/90 is a pretty common set up, 120/90 should be the biggest to fit a 2.15 wheel IMO anything bigger needs a bigger wheel so it doesnt balloon

[MCRider]

Hey guys, I have two rims...a 1.85X19 which had a 3.50-19 tire on it, and a 2.15x18 which had a 4.00-18 on it. I would like to put a 110/90-19 and a 120/90-18 on the rims respectively. Will this work? I have looked at all the tire charts via google search and am not sure about the conversions. I am being a cheap bastard and want to buy the tires over the Internet, so no help from the local shop. Any info appreciated. Thanx!

First a 110/90 is too big for a 1.85 rim. Per my two charts. personally I had a 110/90 on a 2.15 front rim and its just too much tire for a front. Might as well be a millstone. The 3.50 is the best bet IMO.

The 120 is OK on one chart, too big on the other. Obvioulsy a borderline call.

I guess we should ask why the oversize tires?

[Lumbee]

Just looking to go the the most economic route more than anything. 110/90-19 and a 120/90-18 seems to be a common setup, but I am not opposed to smaller tires. Thanks for the input!

[PeWe]

There is a very interesting discussion here about rims and proper tires to match each other, front as rear. It's about angles of the tires, front and rear must be equal.
http://forums.sohc4.net/index.php?topic=19346.25

Check Towers shart where everything will be clear.

CB750 rims std setup: 1.85-19 front, 2.15-18 rear.  The chart will show proper tire combos

[shinyribs]

I have run both 110/90 & 100/90 on my front rim. According to the charts,yes,the 110 is too wide. But it rode fine,handled OK and lasted just fine. BUT,when I dropped back down to the 100 on the front handling improved.

If you already had a 110 I would say run it.You'll be fine.If you have to buy one,I'd go with the 100. JMO.