Arrrgghhh Tyres!!

[kungfoobob]

HELP I need new hoops!

I've got a Michelin Enduro Comp 4 90/90-21 on the front
and a M12 130/80-18 on the rear.

But.......

the books say the front should be 80/100-21 and the rear 100/100-18.

The rim sizes are alike but the rest is beyond me..... what sizes should I fit?

 

[KdxChode]

my bike came with a 100/100 on the rear but the michelins are strange sizes. A 130 is normal for the backif using the m12.