metric = inch tire conversion question

[jonr3]

I've looked at some tire conversion charts and did a thread search, but I'm still lost.

Tire #1 -

I have been running a rear D606 - 130/90-18.

Section width = 130mm

Aspect ratio = 90% (?)

Rim diameter = 18 inches

Tire #2 -

Now, I'm looking at a tire that is: 4.10-18 59P.

Section width = 4.10 inches

Rim diameter = 18 inches

Casing strength = 59P (?)

Anyone know what the difference in these sizes are??

I think, by looking at the numbers and using a metric conversion table, that tire #2 would be a lot narrower than tire #1???

If that's true, what size tire should I look for (in inches) to match the size of tire #1? I really liked the size of the D606 I've been using.

[chakaxr650l]

130 equals roughly 5.1 inches

.9*5.1 = 4.59 inches tall

[BWB63]

http://borynack.com/XR650R/Cycle/Tires.htm

There is a lot of stuff on this sight but, you have to dig through all the pages to find everything.

http://borynack.com/XR650R/