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#1
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1100 - 20 tubes
I'm struggling to find a set of tubes suitable for 20 inch CMP rims here in NZ. I've tried several different local firms and the only tubes that they seem to be able to come up with have a 180mm long valve stem. That'll protrude way too far beyond the edge of the rim. My assessment is that the right valve stem length would be in the region of 80 - 100mm.
Has anyone got a recommendation of where to get tubes from which have a suitable valve stem length? At this stage I'm thinking somewhere in either Australia or the UK only because it's a bit more convenient for me to ship from there. Thanks |
#2
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Do they have screw on stems
Hi Russell
Do they have screw on valve stems out your way? Last time I was buying new tubes had the same issue. Then one of the heavy truck tire outfits suggested tubes with screw on stems. They had to order the tubes and the stems but they had them in pretty short order. But they have worked fine. I don't remember the brand but it was of better known brands. The ones in my picture are the long stems, the ones they got me were about half the length. They also had them longer. Valve Stems.jpg Cheers Phil
__________________
Phil Waterman `41 C60L Pattern 12 `42 C60S Radio Pattern 13 `45 HUP http://canadianmilitarypattern.com/ New e-mail Philip@canadianmilitarypattern.com |
#3
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Thanks Phil.
Whereabouts does the screw connection actually occur? Is it at the connection point to the outlet from the tube itself? One supplier did mention the option of screw on valve stems but at the time what was described to me (albeit second hand) was that the original stem was cut off after the bend and the the remaining stem threaded, then a suitably short stem extension was attached to it. I didn't like the sound of that not knowing how big the outer diameter of the screwed on extension was going to be. If it was too big it would mean the valve stem wouldn't sit nicely in the formed recess in the rim potentially causing stress on the screwed connection. Russell |
#4
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Valve stem
When I serviced truck tires in the 80’s there were still a lot of tube type tires, mostly 16 and 20 inch. Most of the 20” tubes had a brass nut vulcanized into the tube and the valve stem screwed in and the jam nut allowed the stem to face whatever direction you needed. I also remember putting truck tubes into farm equipment and swapping to straight valve stems because the truck stems were too long and stuck out past the rim. With the popularity of tubeless tires, I don’t know what would be available today for tubes or valve stems.
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#5
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Tub has short brass stub
Hi Russell
Yes the tube is made with a brass stub, which the valve stem screws on to. At that time the problem I had was finding a truck tire place that was willing to take the time to find them. Several places just wanted to sell me the tubes they had in stock, which all had long stems. The place I got them is still in business, so next time I drive bye will stop in and ask if they are still available and who makes them. Cheers Phil
__________________
Phil Waterman `41 C60L Pattern 12 `42 C60S Radio Pattern 13 `45 HUP http://canadianmilitarypattern.com/ New e-mail Philip@canadianmilitarypattern.com |
#6
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Some progress
I've made some progress on this. Screw-on replacement valve stems of assorted sizes/lengths are available as previously suggested. You need to cut the original valve stem off at the base just above the thread that secures the metal sheild. The replacement valve stem is then screwed onto this thread. There's a rubber washer that goes between the face of the replacement valve stem and the tube to create an air tight seal.
The down side for me at the moment is that the only replacement valve stems that my local tyre guy can locate at present are those used on earth moving equipment. They are a much bigger diameter than the standard valve stem (for increased airflow)... as can be seen in the attached slightly blury photo. A quick check of the dreaded ebay suggests normal size screw on replacement valve stems are readily available from the US. Will do a bit more research but importing some replacement valve stems is probably going to be the solution. |
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