275-60's will fit stock, 275-65's will need a level and possible some trimming if the fenderwells
Biggest Tires with stock 20" Rims?
I will be taking delivery of my new 2015 GMC Sierra 1500 Crew Cab with Max Trailer Package (6.2L) in the next couple of weeks. Anyone know what is the maximum tire size that can be fitted WITHOUT any modifications and 20" rims?... i.e. no rubbing, spacing, cutting, etc.
Also, I know it will throw off my speedometer. Does increasing tire size also affect the odometer and the mileage (not gas mileage). I know it will affect gas mileage.
I would also like to know if adding the Rough Country (Or a similar package) 2.5" Front level, 2" rear lift kit would provide any additional clearance, again without any other modifications and the factory 20" rims.
What is the first thing that needs modded when a tire doesn't fit? Is it the inner wheel wells where the tire rubs, or ball joints, etc?
Thank you.
Also, I know it will throw off my speedometer. Does increasing tire size also affect the odometer and the mileage (not gas mileage). I know it will affect gas mileage.
I would also like to know if adding the Rough Country (Or a similar package) 2.5" Front level, 2" rear lift kit would provide any additional clearance, again without any other modifications and the factory 20" rims.
What is the first thing that needs modded when a tire doesn't fit? Is it the inner wheel wells where the tire rubs, or ball joints, etc?
Thank you.
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It would, but that would be a slightly shorter tire than stock.push-rod said:Will a 285-50 fit?
A 275/60-20 will have your truck going 72.4mph when your speedometer says 70mph. You can get a tuner to fix that. Your speedometer will be off by the same, so when you hit 7,000 miles you will have really traveled 7,200 miles.
The stock tire size to my knowledge is 275/55/20 I believe? Damnit GM, make larger wheel wells lol.
I will most likely get a tuner, but I've also heard the dealer can also calibrate for the new tires. Is that expecting too much though?
I will most likely get a tuner, but I've also heard the dealer can also calibrate for the new tires. Is that expecting too much though?
Does anyone know if 285/60/20 will fit without rubbing and no other mods?
It should. There is a TON of room with 275-60'sDenaliHD66 said:Does anyone know if 285/60/20 will fit without rubbing and no other mods?
Seems tough finding many tires in a 285/60/20 size. 275/60/20 have more selections. I like either the Goodyear Wrangler Duratracs, BFG All Terrains, or the Toyo Open Country AT2's. I'm leaning towards the Toyos for best all-around performance. The Wranglers I feel would wear pretty quickly. I've never been a big fan of the BFG's but they are a popular tire so I'm not sure yet.robvas said:It should. There is a TON of room with 275-60'sDenaliHD66 said:Does anyone know if 285/60/20 will fit without rubbing and no other mods?
Anyone know what tires these trucks get if I would have opted for the $200 "All Terrain" tires?
285/60R20 is like a 33.5" tire, so I doubt you would fit it without some kind of a level. Maybe a torsion key crank would be all it takes...I'm not super familiar with the HDs
Its a 1500 not an HD. As far as I'm aware there is no torsion adjustment for the 1500s?n8dh said:285/60R20 is like a 33.5" tire, so I doubt you would fit it without some kind of a level. Maybe a torsion key crank would be all it takes...I'm not super familiar with the HDs
Oh oops I though it was an HD for some reason. You are correct, the NNBS 1500s have coilover struts in the front, not torsion bars.
You won't fit that tire without a leveling kit. Most guys run 285/70R17 (32.8", same width as the one you want) with a 2" leveling kit. Your tire size is a bit taller, so you'll probably need closer to a 2.5" leveling kit to clear that tire. Member inkaholic ran a 275/60R20 size with a 2.5" level and cleared them with no issues, so you may need to trim some plastic, but no metal.
You won't fit that tire without a leveling kit. Most guys run 285/70R17 (32.8", same width as the one you want) with a 2" leveling kit. Your tire size is a bit taller, so you'll probably need closer to a 2.5" leveling kit to clear that tire. Member inkaholic ran a 275/60R20 size with a 2.5" level and cleared them with no issues, so you may need to trim some plastic, but no metal.
275/60/20 is probably what I'll end up doing. They are a full inch taller than OEM ones, which is good enough for me.n8dh said:Oh oops I though it was an HD for some reason. You are correct, the NNBS 1500s have coilover struts in the front, not torsion bars.
You won't fit that tire without a leveling kit. Most guys run 285/70R17 (32.8", same width as the one you want) with a 2" leveling kit. Your tire size is a bit taller, so you'll probably need closer to a 2.5" leveling kit to clear that tire. Member inkaholic ran a 275/60R20 size with a 2.5" level and cleared them with no issues, so you may need to trim some plastic, but no metal.
Good luck! Make sure to post some pics when you get em 
I think I've narrowed my choice down to 285/60/20s. They shouldn't require any modding. I want to get the BFG KO 2's. They have an extreme sidewall, great sipes for grip and for ejecting stones, and good all around ratings. The tire diameter comes to about 33.46" so I'm hoping this size will fit without a lift or anything. I think 275/65/20s would be 34.07" and a bit too tall and might not fit without rubbing. I do want the slightly wider size, which is why I think a sidewall compromise is fine.
I'm running fender flares and 295 x 55 x 20 Toyo AT/2's with a 2.5" level kit. no rubbing at all. I also used my phone GPS and the digital speedo on the truck and it matched perfect. )The driveway does slant so it makes it look like it is sitting high in the front.)
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Compared to the OEM 20's though what is your tire backspacing? I want more sidewall for a softer ride and more bite off road. Even though the sizes I want seem to be E-ply rated tires.
It's going to ride rough with the BFG's, period.DenaliHD66 said:Compared to the OEM 20's though what is your tire backspacing? I want more sidewall for a softer ride and more bite off road. Even though the sizes I want seem to be E-ply rated tires.
LT275 /60 R20 are D-rated
If your going to wheel it, I suggest an on board air system so you can drop tire pressure. I have one on my raptor for this. That said, unless you have a tire with extra plys on the sidewall, don't let air out or you will have problems. I had BFG'S on the raptor. Garbage tire. They do not self clean and gum up in mud. Never got more than 30k on them.
Your side bite comes from the lug design anyway.
Your side bite comes from the lug design anyway.
I have the RC 2.5 and 305/55/20 on stock offset rims. There is contact with the sidewall lugs at absolute full lock all the way to the right in reverse. It is so minor that I'm not worried about it and I'm not going to fix it.
New tread design now with the BFG's and you must not have rotated them to get only 30k. Guys go 60k without a problem on the old onesJohn-D said:If your going to wheel it, I suggest an on board air system so you can drop tire pressure. I have one on my raptor for this. That said, unless you have a tire with extra plys on the sidewall, don't let air out or you will have problems. I had BFG'S on the raptor. Garbage tire. They do not self clean and gum up in mud. Never got more than 30k on them.
Your side bite comes from the lug design anyway.
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