Garmin Zumo Tire Pressure Monitor
Great product with important info
Work as advertised, allows you to monitor tire pressure,
April 20, 2015
EXCELLENT RELIABLE DESIGN
Three question about the Garmin TPMS: Is it accurate? Is it reliable? And, is it safe?
Been using the Garmin monitor caps for 3 months/ >1300 miles.
Accuracy: The Garmin monitors consistently read a little less than 1# low when compared to two different US-made quality dial gauges, both of which give readings that are +/- 0.4# to the other. Truth to tell: the Garmin monitors are probably more accurate than the reference gauges.
Reliability: the bike has seen near-daily use since the TPMS was installed. Only once, the front low battery warning came on while riding last winter in 24 degree weather at 70+ (+++?? ;) ) MPH. When stopped, the cap warmed up a few degrees and the warning disappeared. Even then, the TPMS never failed to give a reading. I've not yet had to replace the factory supplied batteries.
Also, they do not leak: the tires were filled to 40#F/42#R when the TPMS caps were installed 3 months ago. In that time they have lost only 1.5# front / 1# rear -- no difference in loss from the previous loss rate (measured cold, with ambient temperature 60-68F in the garage).
Safety concerns: I have angled machined, (solid) one-piece, (racing) valve stems installed on a FJR1300A, and was concerned that the extra mass might apply undue force to the stem elbow, causing a flat due to structural failure there. Per online specifications, the caps have a mass of 8.5g, including the battery. Measuring the distance from the center of the axle to the center of the cap on each wheel gives the torque arm, and by knowing the tire size you can find the wheel RPM for any given speed. This information combined allows you to calculate the centrifugal force applied to the valve stem by the TPMS cap. (Don't sweat the math: there are on-line calculators for this!) Empirically, the one-piece racing stems installed will support more than 10 lbs at the tip without any evidence of movement or deformation. Calculations revealed that the force applied to the stems at 70MPH was 3.9 lbs front and 3.4 lbs rear. Even at 100 MPH (calculated!) the results were only 8.0 lbs front /6.9 lbs rear. Bottom line: I'm not worried...
These caps not only allow the tire pressure to be checked at the start of each ride (important to do but a hassle before), but to follow how weather and riding style influence the pressure at speed. Easily one of the most useful add-ons I've purchased. HIGHLY RECOMMENDED.
April 12, 2015
Peace of Mind...For a Bit More Cost
I bought a pair of these bundled with a 590LM and got a very good deal. I probably wouldn't have bought them ala carte at MSRP.
Super simple to use just screw them on like valve stem caps. Very accurate to 0.1 PSI and battery life seams reasonable. It's also fun to watch tire pressure climb as you ride and/or at more assertive speeds.
Reminder that you need to have solid valve stems to run these as rubber stems would flex too much and risk breaking. I have used them on the 81 degree aluminum stems and work well at highway speeds. I hope FJR nominal speeds aren't an issue.
December 15, 2014
FAST SERVICE WILL DO BUSINESS AGAIN!
Easy instructions fast install and paringFAST SERVICE WILL DO BUSINESS AGAIN!
August 11, 2014
Important travel safety product
I purchased these items to go with my new Garmin Zumo 590 which I mount on a 2011 BMW F800GS. Installation and pairing to the Zumo was simple, just a matter of following the instructions.
I have a fairly accurate manual tire gauge, and the readings from the Garmin Zumo Tire Pressure Monitors are within 0.1 PSI for both tires!
It's easy to bring up the tire pressures on the Zumo screen prior to starting off riding for the day, but the best feature is knowing that if I develop an air leak while riding, I'll be notified by the Zumo before my safety is compromised by low tire pressure.
July 28, 2014
Convieant for a long road Trip.
Rode my 2008 Heritage Softail Classic. Paired this product up with my ZUMO 390 Left Florida for Indiana thru Deals Gap then over to Washington DC Then back home to Florida. Total of 14 Days 3800 miles. Had no problem performed just fine wanted the connivance of being able to read my air pressure while on my road trip. Bike was fully loaded. Road thru rain, Cold weather temps in low 40 , Hot weather around 90 with no problem. Batteries held up have not changed them yet. The pairing up with the Zumo about five minutes pretty simple. Found it interesting how much the Air pressure rises Once the tires heat up. Also while in Indiana it alerted me to low air pressure on both tires probably due to the sudden cold temp drop. Had the local Harley Dealer air the tires up and his gauge matched what the TPS was reporting.
July 14, 2014
Easy TPS that pairs with your Zumo
Bought these to pair with my Zumo 590 - pair easy and appear to be accurate. They provide PSI readings to the 10th of a pound. In my opinion, it's an expensive accessory considering what you pay for the Zumo but the convenience and safety are worth it. FYI - these aren't necessarily plug & play - they require installing metal valve stems on your wheels if you don't have them already so factor that in to your overall installation time & budget. I was able to do this myself with a large c-clamp and a razor and use balancing beads so I didn't need to re-balance.
June 17, 2014
Nice Add On
I bought the zumo GPS so I could use the tire pressure monitor. You can set what each tire should be and what tolerance you have before it gives you a warning that the tire pressure is low. Although caps look huge on-line, they are just a tad bigger than normal cap. Seems to be working well.
May 31, 2014