TPMS on 19.5"

I have a stock TPMS system on one of my vehicles and an after market system on my RV with 19.5's. The TPMS only measures air pressure not tire size. You will have a minimum pressure setting built into your factory TPMS. As long as you keep your pressures above that pre set minimum you should not have an alarm reaction.

I bought a Superchip programmer for a Dodge and it has the TPMS module reader built in and I am able to adjust my tire pressure minimums with the Superchip as well.