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Old 09-01-2015, 01:10 PM   #1
Junior Member
Join Date: Aug 2015
Location: Portland, Oregon
Posts: 18
Installing Tire Pressure Monitors

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, Id 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 compatitable 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)

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Old 09-01-2015, 01:25 PM   #2
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Join Date: Jan 2013
Location: Venice, FL Area
Posts: 259
Contact TST to see if they have any advice for you.

Bob & Sharon, '18 Berkshire 34QS, 2018 Jeep Cherokee.

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Old 09-01-2015, 01:50 PM   #3
2012 Solera
Join Date: May 2012
Posts: 1,022
I found a shop that had special small diameter metal stems with extended mounting nuts that fit the wheels (just). Problem is being able to get a wrench on the nut on the outside of the stem to tighten it down properly. Others have used metal "dually" stems that fit (search the forum) (e.g, Metal Extended Valve Stems) - but are wheel position specific (dual outers and inners can't be put on other wheel locations; can't rotate tires without demounting and switching valve stems around). Suspect internal pressure sensors might work and not require metal stems. It is a problem with the Sprinter wheels.
2012 Solera "S"
Calif SF Bay Area
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Old 09-03-2015, 12:17 AM   #4
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Join Date: Aug 2015
Location: Portland, Oregon
Posts: 18
Thanks for the responses. After consulting with the local Sprinter dealer and the local tire shop that they use, I have decided to install high-pressure rubber valve stems to replace the Coachmen installed long rubber stems. WheelMaster makes and guarantees extension hoses and mounting hardware for TPMS sensors, but they need a stiff valve stem for the base "foundation" of the hose. The tire dealer showed me exactly why the steel wheels for the 3500 do not work with metal stems, and quite possibly that is the reason that MB does not factory install monitors on the 3500's.

I'll report back on this noble experiment (or foolhardy venture) when I complete. I am amazed that MB does not even mention in the Owners Manual that the info on tire pressure sensors does not apply to the 3500. The dealer said that they understand that Sprinter will be coming out with super-single tires to replace the duels on the new 3500's, possibly so sensors will be compatible, but I'm a year too early for that fix.
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Old 09-03-2015, 12:33 PM   #5
Join Date: Feb 2015
Posts: 44
I did all by my self, at Sprinter Prism 24 G
Ordered brackets for rear dual and on
front wheels they have steel mounted
valve housing and have no vibration.
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Old 09-03-2015, 12:48 PM   #6
7 Year Class A RV'er
Join Date: Oct 2014
Location: Winter Park, FL
Posts: 1,061
No experience with the Sprinter but I may have some input for you. I read several reviews where folks indicated there was a danger of striking a curb with smaller wheels if you used the flow through type sensors. For that reason, I used the flow through type on the Legacy and got the other smaller sensors for the toad. I don't have the metal stems on the toad but so far haven't had a problem. Will change them if it starts to be an issue. Might see if TST will swap the sensors for you since it's a new set.
2015 Legacy SR340 360RB
2014 Jeep Wrangler Unlimited Toad

Gigi, Poppy and Sadie Lady...On the road, but not full time!
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Old 09-03-2015, 01:02 PM   #7
2012 Solera
Join Date: May 2012
Posts: 1,022
Long thread that covers this issue for the Sprinter 3500 in the Solera sub forum:
Double Blowout
There are metal valve stems that fit (unless Mercedes changed rims since our 2012) - hard to find, but they exist. Link to a source in post 72 of the thread above, I believe.
Without the added weight of a TPMS I have had two of the "high pressure rubber" stems fail (gracefully- slow leaks I caught on morning pressure checks). Both were attributed to "improper installation - pulled too hard installing and torn". I lost confidence in the rubber stems.
2012 Solera "S"
Calif SF Bay Area
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Old 09-03-2015, 01:53 PM   #8
Join Date: Apr 2015
Posts: 71
Contact this guy Tire-Man: Home Page
I have these valve stems on my sprinter 3500 but I'm not running tpms so i can't help beyond that. Though I might be interested in tpms if someone has success.
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Old 09-05-2015, 01:09 PM   #9
Senior Member
Join Date: Sep 2014
Posts: 164
I have a 2015 Prism 24G. I found a tire store (mcCleas, Santa Rosa, Ca and other locations) that installed new metal valve stems for me, on all the tires. They claimed the rubber ones were not suited to the demands.
They spent a long time custom bending the stems, so that all now are easily accessed outside the wheel covers for filling.
I installed the TPMS myself.
I think you do have to be careful about the stems sticking out, so you don't break them.
So far, very happy with the set up.
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Old 09-08-2015, 05:00 PM   #10
Join Date: Mar 2015
Posts: 57
I have a 2015 Prism 2150 LE, with Dicor SS Wheel liners. I installed a eZ-Tire TPMS system from Eez TV Products myself on all 6-tires + spare tire. This wasn't a straightforward project, but it was successful. Here's what I did.

First I wanted metal valve stems all around. Seeing a metal extension from both inside rear tires, I mistakenly thought these stems were ALL metal. So I ordered 4- metal valve stems from Your Tire Shop Supply - 2-front stems and 2- outside rear stems. The folks there were knowledgeable and helpful. They have metal stems for MB Sprinters. Then I had a local tire shop install the 4-metal stems. There did appear to be a problem with the Sprinter's wheel curvature accepting the metal stems, but I thought there was enough margin so I accepted the installation. It was then I noticed the rear INSIDE valve stems were NOT all metal - only the extenders added to allow access via the outside rear wheel were metal. These extenders were passed through 'rubber doughnut' stabilizers mounted on the outside rear wheels. The stabilizers in my judgement were robust enough to keep the connected rubber stems (attached directly to the inner rears) from flopping around. So .... I ended up with all metal stems on the two fronts and the two outside wheels, but NOT the inner rears or the spare. Now for the 2nd problem.

The new front metal stems did not extend far enough through the decorative Dicor front wheel liners to allow attachment of the ez-tire TMPS sensors, but the sensors attached easily to the the 4-rear and the spare tire valves. So .... I was forced to enlarge one of the wheel liner holes on each front liner to allow attachment and chuck access to the TMPS sensors.

Once you gain clear access to the valve stems, attaching and programming the ez-tire sensors is simple if you follow the instruction very carefully.

So far so good, I can easily read temps and pressures for all 7-tires, but the real test will come during a long road trip planned for November.

The installation was a real hassle, but I hope it pays off.

Good luck to you.

2015 Coachmen Prism 2150LE
MBenz Sprinter Chassis
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