Actually it was in addition to mary900 and reply noted PLopez as noted in lower right hand corner of post.

 

Thanks. I just tried one of the calculators and it shows a 1% difference like Mary900 mentioned earlier. Didn't think it'd be too big of a deal for me, but if it's affecting more than the just the spedometer and odometer, then I guess I should have it done. Also havingto explain it to anyone that happens to drive it every now and then, might become a pain.

 

Most of the time your average or common tire sizes for each wheel size is around a .5 to 2.5% difference. The drastic difference woudl be going from slicks to big mud tires, or vice versa. But most road tires that are more common will give you around a 1% difference. I went from 20's to 24's several times and most of the time the speedo difference is around .5MPH at 60MPH.

 

Please go get your vehicle reprogrammed if you changed to the 20s. As stated it has to do with ABS, traction control, and Electronic stability control!!! You need to do the reprogram.

 

I had a similar experience when I rotated the wheels on my 07 Silverado NBS. Would not relearn at all. So I took it to the dealership, told them the situation, guy said "well you just go into learn mode and then it's good" and he went into the learn mode, honked twice, and then he turned the truck off. Said it was done, I thought "this guy is an idiot" so I left, and let pressure out of one tire, sure enough the display showed the wrong tire. This system is a joke.

 

maybe i should reprogram, i went from 17's to 24's. As for the TPMS i bought new sensors and no problems with programming

 

I wonder if it is an issue with not realeasing the air fast enough, the "tool" the stealership has maybe something that just completely compresses the valve stem and still allows air to flow unrestricted. I had my valve stems replaced when I switched to 20's and I have reprogrammed several times, but I use a valve stem tool to release the air.

 

That's a good point addkev, the faster the air is let out, the quicker the recognition. I noticed that this past weekend when it was time for another tire rotation.

This is the third time I havereprogramed without problems.

 

I bought one Orange TPMS from US Auto Parts. I check many brand TPMS, most of the internal units are more than $200. This one is only $170. it's universal for all passenger car models. I think it's worthy and cheap for me.

Orange TPMS is easy to install. Only need to install sensors and plug in the cigar jet. Then the little kit works. Display is 3.5" x 2" x 0.75", very small. This one need no extra cable. Very easy and useful.

Moreover, Orange unit tested in many racing car (Formula Renault, Honda Le-Manz 24 hrs) I like speed so much, I was wondering if the speed goes too high and it doesn't work. It seems speed not a problem for it.

Continental Tire mentioned TPMS can reduce fuel consumption. It’s a great info for me. I saw the crude gasoline has been $140 today. I need to drive 2 hrs per day. Saving fuel consumption is also a good news for me.

Also, I heard that flat tire is the biggest reason of non-human factor accident. Watching my tire is another reason I need TPMS.

 

Just bought 2012 Tahoe (34K miles). All four tires lose about 5 lbs a day. TPSM problem or that many tires bad at the same time?