Tire Sizes on stock rims

[blasterandy]

Aite, I know this is prolly a very common question next to what i should jet.
Anyways
I have stock rims i think 9X9 i wanted to make sure i am rite that the only number that really makes or breaks weather a tire fits is the last such as 18-10-(9) 18 being tire from top to bottom, 10 being width from side to side, and 9 being the rim size. I am pretty sure i have this correct. Just wanted reasurance before buying em. Also if anyone is interested bikebandit.com has razr mx rears for 41$ a piece. +6$ shipping dunno if n e one cares just thought i would let you know. :D
Thanks Drew

[gotwarrior]

your measurments are "A" OK..;)

[underpowered]

you are correct. it is height x width - rim dia.

[blasterandy]

Cool thanks

[hornetgod13]

Stock rear rims size is 8x9. 8 inches wide and 9 inches in diameter. A tire with a second number of 10 or 11 will be fine. Like you had already mentioned the last number is the most important.

[blasterandy]

I was just wondering i was going to buy those razr mx tires but when i went back the next day they boosted the price back up to 60$$ so i kicked that idea. My question being why does motosport when you put your quad info in give you 18-10-8 size tires too. I am almost positive that they wont fit. I would love to be wrong but...
Any help.
drew