Cannot set tyre size with any affordable programer, unlike other Jeep models. Only the dealer can choose from tyre sizes already programmed into the Jeep that were offered on different spec models. I had mine TIPM updated by the dealer for the largest tyre size they have listed that was on the JET edition with the 20" wheels and tyres, 245/50R20. That worked out at a 29.65" diameter which is 2% bigger than the rolling diameter I had with the 18" Limited wheels, 235/60R18 at 29". Speedo was already reading 3% fast so it is now spot on up to 100 kph but 1-2 kph slow at 110 for the 245/70R17 tyres which are 30.5".
Last edited by Gojeep; 20-04-2019 at 07:44 PM.
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