Tire size

So what size tire is everyone running? I am trying to make sense of the metric size thats on my bike as to what i need to replace it with.

120/90-17 in the rear and 90/90-21 inthe front. Thanks for the help.

You got it! :thumbsup:

120/90-17 is equivalent to 4.60-17

130/80-17 is equivalent to 5.10-17

These 4 tires are acceptable on the rear

90/90-21 would be equivalent to 3.5-21

3.00-21 is equivalent to a 80/90-21

I would stick to the 90/90-21 for the front.

Here is a link to ISO tyre sizes explained



I'm running these on the stock rims.

130/90/17 Rear.

90/90/21 Front.

I'm runnin' a 160 on the back and 120 on the front. Obviously on non-standard Morad rims.

The bikes a 94 Italian import (to the UK ) and it's mental !

I run IRC GP-1's front and rear. Rear is 5.10 x 17 and that seems about right. On the front I have a 3.00 x 21 and that seems a bit skinny.

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