Originally Posted by Sprocket (Post 1480672)

1) If i moved up from the stock 17s to 18s, or at least to 17s with summer tires, how much will my speedo be off? It'll also change the gear ratios I assume?



2) Is there a plug and play method to correct the speedo? Motorcycles have a speedo healer unit you can install to correct the speedo after a sprocket change. Is there a similar way to do this with our cars, and how are most people fixing this issue?



3) What about the TPMS? How is this handled for two sets of wheels? I'd like to have both sets equipped with TPMS sensors, if possible.

Originally Posted by horrorbiz (Post 1480699)

1. Generally when people go up to 18's they get a tire with a shorter sidewall, which allows the overall diameter to be the same. Which would mean your speedometer would not be off.

2. I don't know.

3. You'd need to get another set of sensors and have them reprogrammed each time, unfortunately.