I went down the path of investigating retrofitting HD TPMS to my ‘21 Tri Glide last year shorty after purchasing it…to make a (very) long story short, here’s what I found:
1. CVO wheels have a different valve stem hole size than the standard Tri Glide wheels… so CVO sensors cannot be used with your standard triglide wheels. The sensors also have a different internal profile and are mechanically “keyed” (a small projection that fits the profile of the wheel ) so they will fit CVO wheels.
2. While the radio is essentially the same, and the LCD Display on the gauges will cycle through front, left rear and right rear for tire pressure, the system is looking for custom sensors Harley made by LDL technologies in France. Standard automotive sensors will NOT work or talk to the system because the LDL system uses a different Communications protocol. I tried.
3. You could retrofit CVO wheels and sensors ($$$) to a standard Triglide, but in using the internal Harley system you will not have the ability to adjust the warning threshold for tire pressures. As we know most of us run lower tire pressures then factory for a better ride. This would be annoying after the first 5 miles to keep getting alarms.
4. In the end, I went with a Fobo 2 external TPMS system with screw on sensors. I used an 83° metal valve stem on the front and have sufficient clearance so the front rotor does not interfere. Kurveygirl.com had the valve stems.
The Fobo system has the ability to set tire pressure warning levels and the app runs on my iPhone, which will also show up on my radio display on the trike as I have CarPlay.