Tire. size and rpm difference

junglejoe

New member
Joined
Jan 11, 2015
Messages
399
Reaction score
1
Location
Mo
I have 275/70/17s on my new (new to me,07 reg cab) truck now.. Will be switching to a 37/13.50/20..
Does anyone know how much it will lower the rpm at highway speed? Like now at 70 mph In at roughly 2100-2200 rpm, 373 gears with a 6 speed manual
 

Latest posts

Top