Info needed: 9.00-16 tube stem size?

[Jordan Baker]

I started to mount my 9.00 x 16 tires today on my rim but I’ve run into a problem. I believe the tubes that came with the tires have the wrong size valve stem.

What is the correct valve stem for the 9.00 x 16 tube to fit in the CMP rim?

This is the stem on the tubes I got.

[Phil Waterman]

Hi Jordan


All the tubes I've used on any of the CMPs have metal valve stems that screw into the tube. Will try and take some photos tomorrow when I'm in the shop.


Cheers Phil

[hrpearce]

Hi Jordan, this is what I have.
Found a better picture.

[Hanno Spoelstra]

You need a metal, angled valve stem.

The come in various styles and dimensions, though...

[Bob Phillips]

Hi Jordan
Also having issues with tubes, but here are pictures of what I bought, look like the same source as yours. These will fit and work in 900x16 but I wanted to use them in 1100x16 Michelin tires and my tire guy things the tube material is too thin and plasticy to stretch - anybody have experience with this problem ?
BP

[rob love]

One problem you may run into as well is that most of the tubes available these days are valve off center. The CMPs, along with the M series deuces and dodges use valve on center. You will also want a re-enforced valve on center flap so the inner tube doesn't work it's way through the slot and blow.

The local tire shop here did the museums tires before I came, and they were using the valve off center and dragging the valves over. Some would fail in the first month, others worked until their first long drive. I think I have replaced almost all of them now, although they also welded the split rims on some of them to make them "safe", so most of those I have to scrap.

I bought some from Wallace Wade at the MVPA convention years back, and tracing backwards, later, from his part numbers I found the supplier in the US. They were happy to ship in quantity, and at favorable prices.

While they are made in China, they have worked out well for me. The part number for the 825/900R16LT tubes is 11021, and they have the TR440 valve. The flaps are part number 99012 and have the heavy re-enforced area around the stem. The distributor is Doberman. http://www.dobermanntire.com/our_pro...17&subcatid=25

Regarding using them in a larger tire...my money says you would likely be OK. Are they for highway use or just casual use?

[Bob Phillips]

Hi Rob,
My purpose is to build a road vehicle ( to whatever extent a cmp can be considered a road truck). I have used the larger tires in the past with smaller tubes but they were heavy duty, heavy rubber tub es. At this point I will pull apart some more old wheels and try to come up with a good set of 4 heavy rubber tubes, by the way do you (or does anyone) still use replacement valve stems É I remember when the tire shop would burn melt them onto the tube when the old valve stem had failed.
BP

[rob love]

When I checked with my tire shop, it turns out a valve assembly that you vulcanize onto a tube will cost more than the complete tube. I was hoping to modify the available valve off center tubes to valve on center. The thought of $50 innertubes ended that. I think we paid about $16 a tube (USD) for the ones from Doberman. While I am by no means afraid to patch inner tubes, and do frequently when the leak is obvious, it is the slow leaks that take up too much of my time.

[Mike K]

Somebody pointed out to me years ago: its not good practice to have the valve stems protruding out beyond the rim edge, the stem can easily be broken off by hitting any passing object. Or even hit a bystander or other vehicle.

We were standing around looking at a club members F15A and John Bruce made the comment "that's bloody dangerous" the valve stems were protruding way beyond the rim edge

[rob love]

I've always heard that about the valve stems, but after 40 years am just about ready to file it under old wives tale. A lot of the Jeep tires had valve stems that extended a bit beyond the rim......never had to repair one for that reason. As to hitting bystanders, if they are close enough to be hit by the valve stems, then they are close enough to get hit by the fenders or the bumper.

[Lynn Eades]

Back in the day (when ever that was) the old tubes were rubber and they would stretch for miles. They were great tubes. Now they stretch and stay stretched. I'm not sure how far they can go.

[Jordan Baker]

Thanks for all the quick help.

Rob I got in touch with Dobermann Tire. Very easy to deal with and the tubes are on the way. Their price is awesome too

[rob love]

Originally Posted by Jordan Baker

Thanks for all the quick help.

Rob I got in touch with Dobermann Tire. Very easy to deal with and the tubes are on the way. Their price is awesome too

Glad to be of some help.

Or as the old grouchy warrant used to say: Always happy to share my opinion, even when it's not asked for.

[Russell Boaler]

On the subject of tube stems I've got a couple of 1100x20 tubes that are 50 odd years old that I was planning to re-use but the threaded tip of the brass valve stem is damaged (uneven face) and a normal air compressor connection won't seal on it (one of the dangers of having the valve stem extending too far from the rim I guess). I could file the end down to achieve a flat sealing surface but then the tip of the valve will protrude out from the valve stem which isn't good either. Does anyone know if there's a tool available out there that can re-cut the valve seat deeper into the valve stem?

[Lynn Eades]

Russell, some of the brass stems can be screwed off. Would you be that lucky?

[Russell Boaler]

Nope, unfortunately not Lynn. I really don't want to throw away a perfectly good " they don't make them like they used to" tube (almost weighs as much as the tyre) just because of a bit of damage to the tip of the valve stem.

[Lynn Eades]

Russell the valve keys can not only r&r the valve but also tap out the thread and tidy up the thread on the outside. Failing that you might still be able to have a new stem vulcanised onto it.