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Old 02-05-2010, 12:52 PM   #147
StephenB
G(/)S ... what else!
 
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Joined: Aug 2005
Location: Ontario
Oddometer: 2,046
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
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Stephen Bottcher
Ontario, Canada

'72 R75/5 The Blues

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StephenB screwed with this post 02-05-2010 at 12:57 PM
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