i used to be a mechanic back in my late teens and early 20s and saw those same caps. they tend to leak after awhile. they do have aftermarket TPMS for cars
http://www.ebay.com/itm/like/2213175...chn=ps&lpid=82 this would be cool to throw on a scooter but i still dont like the idea that they use the stem but if they made them similar to most the corvettes where they are strapped around the rim id be all over that!! lol