I recently upgraded my wheels from the oem 17 inch to aftermarket 20's. Even though the TPMS correctly measures the inflation of the tires, the computer's choices are 17", 18" or 19" wheels. My questions are:

1. Is there a way to change the settings to add 20"? (I have the enthusiast version of the Durametric); and

2. Because it is set at 19", what negative effects, if any, does it have with the speedometer and odometer?

 

speedo/odo will depend on tire size not rim size

 

Here is a comparison of the 2 wheel sizes:

http://www.tacomaworld.com/forum/tir...5r18-275-40r20

 

Thanks...the chart is very helpful!