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Old 05-10-2011, 08:30 AM   #1
colton1219 [OP] colton1219 is offline
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Tire size help?

I have 285 70 17 KM2 tires and rub to much even with my lift. I have 4.88 gears and a 6 speed to boot so my rpm get a little high.I have considered a 255 85 16 but they are pricey and they will still probably rub?I want to know if I went from a 32.5 tire (my 285 70 17 s') to a 235 85 16 or a 265 70 16 that is only 31.5 tall if it would help or hurt my MPG. I will be going to an A/T tire and also saving about 15 lbs each wheel. My RPms' will go up about 200-400 because of a smaller tire but what do you guys think ,will I help myself with fuel consumption?Thanks
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Old 05-10-2011, 10:37 AM   #2
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sees what you did there.
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Quote:
Originally Posted by colton1219 View Post
I have 285 70 17 KM2 tires and rub to much even with my lift. I have 4.88 gears and a 6 speed to boot so my rpm get a little high.I have considered a 255 85 16 but they are pricey and they will still probably rub?I want to know if I went from a 32.5 tire (my 285 70 17 s') to a 235 85 16 or a 265 70 16 that is only 31.5 tall if it would help or hurt my MPG. I will be going to an A/T tire and also saving about 15 lbs each wheel. My RPms' will go up about 200-400 because of a smaller tire but what do you guys think ,will I help myself with fuel consumption?Thanks
What is the backspacing of your rims, and the specs of your lift?

Did you trim any fender well plastic? Chop the cab mount?
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Old 05-10-2011, 04:24 PM   #3
colton1219 [OP] colton1219 is offline
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Backspace is 4.5 and no trimming witch I really dont care about the rubbing, the issue is I want to better my mpg . My question is more about running the different tire sizes and gear ratio I have to get the best MPG?
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Old 05-11-2011, 06:52 AM   #4
colton1219 [OP] colton1219 is offline
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46 views and no opinions ,there is another post about 255 tires right now and there are 3 pages . I know somebody can help with my mpg questions ?
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Old 05-11-2011, 08:49 AM   #5
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Higher RPMs are going to use more gas, but your driving style is going to make more of a difference. I wouldn't be running 4.88's unless I had 295+'s mounted.

The question I have for you is, why did you regear?
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Old 05-11-2011, 01:18 PM   #6
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Bought the truck that way, and i got a great deal so my question is What tire size do you think I should run to help myself for MPg's with my set up not factory gears? Thanks
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Old 05-11-2011, 01:43 PM   #7
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If you drive off road I would run Load range C, AT tires. If you are always on the road choose high quality P rated truck tires. You are going to have better results running bigger tires, I would probably stick with a 285/70 17.
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Old 05-11-2011, 02:54 PM   #8
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Quote:
Originally Posted by colton1219 View Post
Bought the truck that way, and i got a great deal so my question is What tire size do you think I should run to help myself for MPg's with my set up not factory gears? Thanks
with 4.88s, 35" or 37" tires...

i have seen a couple tacos running 4.88 on 33s and they were burning up rubber pretty bad...
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Old 05-11-2011, 08:02 PM   #9
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what do you mean burning up rubber? Are they wearing any faster than normal ?
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Old 05-12-2011, 05:31 AM   #11
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Thought that would have been a throttle issue?
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