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I did a search so i wouldn't have to waist your times. but i found nothing.

What size inner tubes do i need for my '99? Stem type? TR4/6, etc.
Any brand suggestions?

Turns out my tires were about 6 years old and the wheels might not even be repairable. So i'm gonna go ahead and replace the inner tubes as insurance.

If i had to buy new rims, that seems like a hassle as well, not knowing what fits or doesn't fit.

This is what I have in my notes for the last rear tube I ordered. TR-6, Size- 3.75/4.00/4.25-18. The tr6 is the stem you want.

The front is a 21" in 80/100 size so 80 mm is about 3" wide.

I found this page was a little helpful.

http://www.cb450stuff.com/tires/

I've had luck with the least expensive tubes available online from where ever I happen to be ordering my batch of parts and supplies from.

rmatvmc.com