tubes

[stockman]

I was looking at ordering new tires and tubes and was going to move up the rear tire size to 120/90-18 and was wondering if I need to match the tube size to the tire or to the rim size? Anyone---

[nhmaf]

A tube will generally accomodate a range of tire sizes, but the wheel diameter must be a correct match.  For example, I use Metzler tubes - they are a bit heavier/thicker rubber, which has its pluses and minusess.
I use Metzler # ME E18 34G front tire tube and ME F18 34G rear tire tube, though when traveling/touring I just carry a front tire tube on the bike - it will easily expand to handle anything from a 3.25 to 4.00 inch or 90/90 or 100/90 - 120/90 18 tire with a bit more air.   But for a 'precise' fit, I generally run the slightly large rear tube when changing tires.

Many other tube mfgrs will have similar range of application.

[stockman]

That clarifies it for me. I looked around and came back confused ( I'm a little slow). Thanks to a fellow NH R65 rider. [smiley=bmw_smiley.gif]

[montmil]

The 120/90 looks pretty cool on the back of an R65 but can be a small challenge to fit without rubbing the swingarm. My '81 had a 120 Metzler out back that generated many new oaths whenever I had to pull/replace the rear wheel. I went back to the 110. Your mileage may vary.   Monte

[stockman]

You know I would stick with the 110 also but my son wanted me to change to 120. I think I will do the 110 thanks again for the wisdom.

[stockman]

Tires and tubes ordered (stock sizes) thanks to everyone for the help. I'm sure the new tires will make it ride even better. I've done the Steering head bearings clean & repack, front fork seals and rear shocks (Hagon). After this Ill start riding it to work give the Vstrom a vacation.
Thanks again. [smiley=bmw_smiley.gif]

[nhmaf]

Most tires mfgrs, the 110/90 is the closest to the original 4.00" tire that came as original equipment - you'll be happy you went with them the first couple times you have the rear wheel off.