smaller winter tires then oem?

[blacksport57]

hey guys, i just bought new winter tires for my ram. my stock tires are 275/60/r20 and the new winters are 275/65/r17.i got them from the dealer ship and was told id be fine. but i wanted to check with you guys. will this damage anything or just throw my speedo off a bit? thanks

 

[blacksport57]

yes i bought all four new. so my speedo will recalibrate my speed? and i was told my trac control would be delayed cause of this. is that true?

 

[blacksport57]

ok and i run the 8 speed tranny. same idea tho? and i will for sure. my brother just got a new jeep so when i put them on ill run by him to check my speedo or use an app on my phone

 

[Buddy]

I plan on buying 18" winter tire/rim package from Tirerack, the OD will be slightly out from 33" that is on it now. I just figured my speedo would be slightly off for the winter. Didn't bother me.

 

[SIhemi]

I went from 20's to 22's and my speedometer was off bu 2 1/2 mph. If you have a tuner you can adjust the tire size

 

[ehmcj]

hey guys, i just bought new winter tires for my ram. my stock tires are 275/60/r20 and the new winters are 275/65/r17.i got them from the dealer ship and was told id be fine. but i wanted to check with you guys. will this damage anything or just throw my speedo off a bit? thanks

The difference in height is 33" for the 20" and 31.4" for the 17" since you bought them from the dealer they should change the diameter in the PCM for you - no charge. But if you have a Tuner (like Diablo) it will allow you to do it yourself. If you don't The speedo will read high, and rack up the mileage faster than if it was calibrated correctly.



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