Hey guys I'm trying to decide wich size tire to run on my row rig. 275/65r20 or 305/55r20. Stock is a 265/75r16. What do you guys think the biggest factor for power loss is with bigger tires? Is it the gearing change of the taller tire. The extra weight from larger tires or the extra width causing drag? I like the tall skinny look of the 275/65 and it is lighter then the 305/55 but the 305 has a closer revs per mile to stock. Wich way would you go?
Tire questions?
- Thread starter 1adam12
- Start date
jeep-N-montero
Formerly black_ZJ
- Location
- Bountiful
Why not 255/85r16?
boogie_4wheel
Active Member
- Location
- North Salt Lake, Utah
The power loss comes from the change in the drive ratio because of the difference in the diameter/circumference. In larger vehicles, I don't think the change in weight is felt.
camicaztoy
Active Member
- Location
- Layton, Utah
I'm running 285/75r16s on my diesel and have for quite a while. I've been very happy with it. Highway mileage actually went up and it seems to handle better.
LT.
Well-Known Member
- Location
- Los Alamos, New Mexico
Boggie is right. One other thing though, even if you were to go with the same overall dimensions of tire height and width just going to a 20" wheel will make your wheel and tire combo weigh more. This will affect your power and mileage as well.
LT.
LT.
sawtooth4x4
Totally Awesome
- Location
- Land of East Laytonshire
aluminum is heavier then rubber. so running a 20" wheel compared to a 16" wheel, will give you more parasitic loss.
I have 18" wheels on my F350 and 33" tires. factory was a 34" tire on my truck. I get a little more low end torque which is fine for me. I just use the truck for towing. its not lifted.
I have 18" wheels on my F350 and 33" tires. factory was a 34" tire on my truck. I get a little more low end torque which is fine for me. I just use the truck for towing. its not lifted.
LT.
Well-Known Member
- Location
- Los Alamos, New Mexico
Sawtooth4x4 is correct. Now, the biggest factor you will see any gains or any losses in will be the overall diameter. Next will be the overall weight of the tire and wheel combo. Weight will make less of a difference once moving but, getting things to move is when you will notice it most. The overall diameter you will see gains or losses weather you are accelerating or all ready moving. The larger diameter will reduce your overall effective gear ratio. I hope that makes sense.