[black370srt8]

had 275 40 20 when i bought it all the way around wanted a little taller tire for that back so i got a 275/45/20 not that much of a difference but was looking at price also now the speedometer is off saying going slower then i am is there a way to reprogram it to read the correct speed or no?

 

[efxman]

You can fix it with a diablo tuner, look at their site for what tuner to buy for your year car etc.