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Can I run 285/75/16 tires on my K1500

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fonecop1

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I am thinking about putting a set of 285/75/16 Cooper Discover ST tires on my 95 K1500. Is anybody running 285's on their K1500? Any problems with clearance?
Thx,
Bob
 
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probably need to crank the torsion bars a bit. kid from school runs same tires on a 2500 light duty and he says they dont rub and he didnt crank the t-bars but i find that hard to beleive since my 265s rub in 4wd
 
My cousin did his w/o cranking and it didn't rub until he went off road then the smashed the top of the fenders when it flexed too much. Now it is cranked but not all the way and is fine.
 
Crankme69 just put 275/55/20s in his 95 C1500 and they rubbed some and would hit the fender when suspension traveled.

However his wheels are 0 offset, just like the factory wheels I think. Your wheels will be wider and taller, so I think you'll have more issues. The rubbing would probably been solved with -12mm offset (1/2") or maybe even just some 1/4" wheel spacers. Some coil spacers will solve the suspension travel issue. When putting that big of wheels on you typically need negative offset wheels or spacers, and some type of suspension lift, but your 4x4 likely has some more lift than a 2WD.

You will also take a LOT of torque away that you can put to the ground, and dont think youll like the result.
 
buddy said:
Crankme69 just put 275/55/20s in his 95 C1500 and they rubbed some and would hit the fender when suspension traveled.

However his wheels are 0 offset, just like the factory wheels I think. Your wheels will be wider and taller, so I think you'll have more issues. The rubbing would probably been solved with -12mm offset (1/2") or maybe even just some 1/4" wheel spacers. Some coil spacers will solve the suspension travel issue. When putting that big of wheels on you typically need negative offset wheels or spacers, and some type of suspension lift, but your 4x4 likely has some more lift than a 2WD.

You will also take a LOT of torque away that you can put to the ground, and dont think youll like the result.
Click to expand...

I think unless you have 4.10:1 gears you will get bogged down too much. 265/75's are fine or if you are looking wider a 32x10 would be an improvement.
 
The truck has 3:73's in it. The reason I was gonna go with them is because my Son works at a tire shop and could get a set with 95% tread on them for 1/2 price. I don't want to kill the truck though. The truck is semi retired but I still drive it a few days a week and use it to haul wood, usually the wood is just a couple miles from the house though. Other than the wood hauling all it sees is light duty and highway driving, do you think it will make that much difference for that type of driving?
 
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It most certainly will drop yr final drive ratio down...

I like how mine turned out...I can cruise on the expressway at 70 now just a tad under 2K on the tach, sweet but I do alot of superslap driving, about 100 miles a day, so it may not be for everyone.
 

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The couple of days a week it gets driven is to work and it's an 80 mile round trip to St Louis and back.
 
265/75/16 is a 31.5" tall tire and 245/75 is a 30.3" tire. So its still going to drop the final drive ratio but not require any modifications.

285/75 is a 32.5" tall tire and would essentially make it feel like a 3.42 geared truck, which would still do OK, thats what I have.

Crankme started with 235/75/15 tires which are only 28.5" tall, so his dropped down to like 3.3 gears

However, your truck will still have less power to the ground since the overall height is taller. Its just that your reference right now is how a 3.73 gear feels with a 245/75/16 tire most likely. So relative, a 285/75/16 tire would then feel how a 245/75/16 tire would feel on a 3.42 gears.

If us that started with 235/75/15 put 285/75/16 on it would be like dropping from 3.73 to 3.25 gears
 
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Thanks for that info Buddy. 3:42 don't really scare me, if you would have said 2:73 or something like that it would have been a different story. The truck has 334,000 miles on it and is somewhat tired anyway, I just don't want to bring it way down.
 
275/55 R20's are ~32inch, so that is equal to 265/75 R16's. I started with 265/75's on my Old 02 GMC and when I put the 275/55 R20's on the speedo nearly the same according to my GPS. I had factory 08 Denali wheels and tires.
 
Go to grimmjeeper(dot)com for a gear ratio calculator. Punch in your gear and tire specs, motor RPMs, and speeds driven and see what you get. The site has been a favorite for me to play with gear ratios and tire sizes for my Toyota FJ40. Very informative site.

Don
 
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