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Old 09-08-2015, 05:45 PM   #11
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Thanks for the "whole enchalata" on your experience. I'm doing the stainless extention hose route, bolted to the center hub of the chrome wheel cover on the rears, trying to reduce the load of the TST sensors on the stems. The front will be similar to your modified cover solution. Please keep me posted on any further problems, and I'll do the same. Only one trip before the sensors are installed on the 5th of October. ...crossing my fingers!

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Old 09-09-2015, 01:16 PM   #12
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I know several people that found that the screw on flexible tire extender hoses leaked, or broke loose and flopped around. Consider the hard extensions, you will have to remove, and re-balance the rear inner tires, but long term you'll forget about the added expense.

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Old 01-16-2016, 08:12 PM   #13
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Sprinter Tire Air Valves

Originally Posted by cruncher View Post
I purchased a set of TST tire pressure monitors in August. I programmed the sensors for my 2015 Sprinter-based Motorhome (Coachmen Prism, Class C), and I took the set to Les Schwab (local tire chain) for installation. I told them that I needed rigid metal valve stems installed to avoid vibration that could lead to leakage, which I had learned during research prior to purchasing the set of sensors. They took one front wheel off, verifying that no factor monitors were present, and found that their metal stems would not seat correctly with the curvature of the M-B wheel. Further, they advised that the sensors wouldn't work with the vanity chrome wheel covers, and the front sensors would run the risk of hitting a curb because they stuck out so far. So nothing was done on my installation, and they did not charge for the advice.
Have you heard of similar problems with Sprinter chassis wheels, and what was done to correct the problem? I feel the sensors are very necessary, as we experienced leakage from a valve stem extension on the outside dual twice on a 2,000 mile trip that we just completed this morning. I understand that polished aluminum rims are a potential solution for the front and the outside duels, but that the inside duel must remain a steel wheel to accommodate the M-B lug bolts. If I blow $1,400 for the aluminum rims, Iíd still be stuck with the inside duels not being able to have monitors because of the curvature? With so many Sprinter 3500 vehicles being sold, this must be some mis-information being given to me, or are aftermarket pressure monitors not compatiable with this type of vehicle?
I would appreciate any advice from someone who has had similar problems. My next step is to go to another tire shop that is willing to tackle the situation, but I thought it best to ask the forum first to see if there is any insight.
Thanks in advance - Steve (posting same on the Sprinter Forum)
Hi Steve and the rest of this forum. I struggled with how to properly inflate and monitor tire pressure with our MB Sprinter RV. The issue is most certainly the fact that the MB standard wheel requires a special valve stem. The easy way to resolve the problem is to use rubber valve stems which is exactly what MB does. Rubber valve stems are only rated at 65 psi, but the standard tire is rated up to 80 psi. Factory specs call for 61 psi so the rubber valve stem is appropriate and fits the curve of the MB steel wheel. Here comes the problem. Most of us aren't tire mechanics. Also in order to cure the problem of checking and filling the Sprinter tires you are faced with reversed wheels and the inability to check tire pressure without proper truck tire knowledge and equipment. After nearly 9 months I have solved the problem. I worked with our local MB car dealer (not much help) and a local truck tire repair facility (also not much help). However, what I learned from my lengthy efforts is that you can purchase a Sprinter specific valve stem package from Camping World where they sell solid metal valve stems manufactured by Wheel Masters. The Wheel Masters solid metal valve stems cure the issue for the dual rear wheels, but not for the front tires. Please note that all is OK if you leave the beauty rings off your wheels. I wanted my RV to look its best with the beauty rings so I still needed to find a solution for the front wheels when using the beauty rings. The only option I was able to find was the snap in rubber and metal valve stem rated up to 80 psi. The rubber high pressure rubber snap in valve stem worked just find and then I mated it with a 2 inch straight valve extender from Wheel Master, also purchased at Camping World. I used Permatex medium strength bonding agent on the high pressure valve threads when attaching the solid metal 2 inch wheel master valve extenders. All six wheel beauty rings are now installed together with a TPMS tire pressure monitoring system. The plus to my efforts is that the dual wheels don't have valve extenders. My dual wheels have solid metal valve stems. The front tires have high pressure valve stems which is a serious upgrade over the original MB rubber valve stem. Wheel Masters saved the day together with the high pressure valve stems. I hope my post helps fellow MB Sprinter RV owners.
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Old 01-17-2016, 09:59 PM   #14
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Location: St Simons Island, GA
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A little off subject, but called TST Friday to get a few of the "metric" O rings that are inside each external sensor. The lady said she would send me several of the O rings AND the seals [larger O rings] that should be changed each time the battery is changed for FREE. Yep, FREE!
They said all owners of the TST systems should do preventive maintenance and for everybody to call and they would supply the O rings for free. Now that is service! Just thought I would pass this on. 1-770-889-9102
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Old 01-18-2016, 09:50 PM   #15
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Tire minder does the same thing. They will also replace the batteries for the first two years for free.

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