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StephenB · 02-05-2010, 12:52 PM

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: http://www.csgnetwork.com/tireinfo4calc.html

02-05-2010, 12:52 PM	#147
StephenB G(/)S ... what else! Joined: Aug 2005 Location: Ontario Oddometer: 1,998	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: http://www.csgnetwork.com/tireinfo4calc.html __________________ 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 www.stephenbottcher.net StephenB screwed with this post 02-05-2010 at 12:57 PM