I am using a 4 Channel TPMS, externally mounted sensors, meant for cars, plug into a cig socket. Can't even remember the brand cause it is China brand, and bought it off from a friend who decided he wanted an internally mounted sensors.
Pros:
1. In riding pressure monitoring, with tire temperatures (?? accuracy ??). Good to sense if you are loosing air and can plan ahead for that leak fix.
2. Convenience under normal circumstances as you don't have to work hard to probe the pressure. Guess long tire life is the result if you can monitor the pressures. Great for lazy ppl like me who seldom check tire pressures and use the kick the tire method to estimate good pressure.
3. Being a China brand, and a car unit, it means cheaper than most bike specific TPMS.
4. The unit that I have has a USB 5V output. I use it to charge the phone or gps unit.
Cons:
1. The low pressure alarm is not loud enough to be heard when moving in highway speeds unless you are paying attention.
2. Since it is a car unit, it is not Waterproof, so your own device to make it WP.
3. You won't know the pressure till a few seconds after moving. So u really can't check the tire pressure before the ride.
4. Since it is mounted in a Cig 12V socket, u need to install one and also it can get stolen if you forget to remove the display unit.
5. Putting on pressure to the tires is more work now, as the external sensors needs removing with a special anti theft tool.
