View Single Post
Old 02-05-2010, 12:52 PM   #147
G(/)S ... what else!
StephenB's Avatar
Joined: Aug 2005
Location: Ontario
Oddometer: 2,044
It's just an aspect ratio, both should fit fine. The 120/90-18 has a slightly larger diamater (1in) than the 120/80-18. The 4.00x18 is a (decimal) 102/100-18 and is a tad smaller than the 120/80-18 in tire diameter.

Use this calculator:

Some of the above is fact, some is fiction, some is my personal imagination and some is just simple truth. [me]

... i'm not touring around the world, but neither are most of the guys i see running overloaded spam cans ... [bmwblake]

Stephen Bottcher
Ontario, Canada

'72 R75/5 The Blues

StephenB screwed with this post 02-05-2010 at 12:57 PM
StephenB is offline   Reply With Quote