Have a 2018 Accord Sport with the 19" rims and Goodyear Eagle Touring tires (OEM tires for early production 2018 Accord Sports). The tires provide for a stable ride on smooth, dry surfaces but aren't good on snow/ice which we have in WA State. Overall, the OEM wheel/tire package is too fragile for my liking: too easy to curb rash the wheels; too easy to damage the tires/wheels in potholes; don't think the purported handling advantages of this wheel/tire package outweighs the losses in mpg due to heavier weight, potential damage issues and tire replacement cost in this (low aspect ratio) size. So, thinking of replacing the OEM rims with 17" or 18" wheels - I understand you can downsize up to two inches? If this is not correct, please advise. My primary question, however, is what will rim downsizing do to the TPMS system? Do I have to buy new Honda TPMS plugs, seals etc for the smaller size rims? If so, this might be a deal breaker. New to this board, thanks for any information.