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There are two basic designs: those that place the sensor inside the tyre and replace the valve stem; replacement valve caps with an integral sensor, that simply screw onto a stock valve stem. I tried an example of the second type, but found one of the caps hit my custom brake caliper, so I'm still looking!
Garmin. Connects with my Zumo 390LM, gives low psi alarms, readings on the fly. Even graphs the psi over time. Small dime batteries last a year.
All my vehicles have TPMS, I like it.
7 Surprising Harley-Davidson Products that Are Not Motorcycles
Slideshow: The bar-and-shield logo shows up on far more than motorcycles, some of the company's most unexpected products have nothing to do with riding.
Slideshow: From the troubled AMF years to modern misfires, these bikes earned reputations for reliability issues, questionable engineering, or disappointing performance.
Crazy Bunderbike Build Looks Amazing, But Is It Impossible to Ride?
Slideshow: The Swiss custom shop has taken a Harley Softail and stretched it into something so long and low that it looks closer to a rolling sculpture than a conventional motorcycle.
Engraved Rebellion: Inside Bundnerbike's Glam Rock II
Slideshow: A standard cruiser becomes an intricate metal canvas in the hands of a Swiss custom house known for pushing Harley-Davidson platforms far beyond their factory brief.
Slideshow: Harley-Davidson's challenges aren't abstract; they show up in dropping shipments, shrinking dealer traffic, and strategic decisions that aren't yet translating into growth.