What size tires do you have on your 550?

[Fixxxer]

Hey guys. I ordered a 100/90-18 Cheng Shin Hi Max for the rear on my 78 GS 550. I figured this would be a good size because 100/25.4 = 3.9 inches. The stock size was 3.75 and it currently has a totally bald 4.00 x 18 on it. So 100/90-18 seemed like it would work. Well, when I got it, it had a (3.25-3.5) designation on the sidewall. According to the chart I looked at, this should be the standard size of a 100/90-18 FRONT tire. So I though this was a front, and that I had been sent the wrong tire. However, the part number matched the rear tire of the same size. Is it possible that the front and rear tires in this size are the exact same width? In any case, this tire is TINY by comparison (in width, but especially in height as well) so there's no way that I can use it on the bike.

So, what do you guys use on your 550s in the rear? Would a 110 be a better way to go? 120? Should I look around and try to find a 4.00 or 3.75 somewhere?

Thanks for the help!

[first timer]

100/90 front
120 back is fine

[brveagle]

i run a 110 and wish i could go to atleast a 130..


run as big as rear on your rear as you can (safetly)

[8trackmind]

100/90/19 Front
120/90-18 Rear