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Pat,
It will be close enough. It will be rounder, treadwise, not rim. I recently put a 140/80 on the rear, this is similar in that the recommended size is 130/90. It sits different due to the slight extra width on the same rim making it rounder in profile. I like it it almost falls into a corner now instead of having to push it.

The first number is the width in mm. The second number is the "aspect ratio" a fancy name for the height of the tyre's cross section expressed as a percentage of its width.
On the front it may make the speedo inaccurate but not by much.
The manfacturer will have specs for rollonig diameter.

Darcy
 
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