275/55R20 -> 305/55R20?

btj_z71 · November 30, 2016

Hey Forum,

It's getting to be around that time for new tires on my 2014 Silverado Z71 (Have 2" leveling kit on it). If I add 2" wheel spacers, I think I can negate the rubbing issue I've read about on here. My thought on this is that since a 305/55/R20 is a 12" wide tire, and the stock 275/55R20 is 10.8" wide, adding 2" spacers should fix that issue I guess. However, I'm also not sure if the 305 tire will even fit correctly on the stock 20" chrome wheels.

I used https://tiresize.com/calculator/for comparing the tire sizes (attached).

Stock tire: Goodyear Wrangler SR-A, 275/55R20

Want to upgrade to: Cooper Discoverer S/T MAXX, 305/55R20

Tire Size Service Description UTQG Load Range Sidewall Approved Rim Width Measured Rim Width Section Width Overall Diameter Tread Width Tire Weight Max Load Tread Depth (1/32") LT305/55R20 121\118Q (Blank) E BLK 8.5 - 11 9.5 12.5 33.43 10.28 68 lbs 3195 18.5

What do you guys think?

michigan2500hd · November 30, 2016

Not sure about what fits on the 2014 without rubbing just know with a tire that heavy along with the change in a taller tire your going to feel like you lost quite a bit of power. What gear ratios do you have in the axles? I went to a 33.1" tire from the stock 31.6" and I could defiantly feel it. I have the 6.2 and 3.42 gears. Really makes me want to get 4.10's. Your truck will look really nice with that tire though.

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Rawyzf · December 1, 2016

I have an old thread of 305/55/20 vs 275/60/20 if you want to see pics and comments.

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btj_z71 · December 1, 2016

Not sure about what fits on the 2014 without rubbing just know with a tire that heavy along with the change in a taller tire your going to feel like you lost quite a bit of power. What gear ratios do you have in the axles? I went to a 33.1" tire from the stock 31.6" and I could defiantly feel it. I have the 6.2 and 3.42 gears. Really makes me want to get 4.10's. Your truck will look really nice with that tire though.

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btj_z71 · December 1, 2016

I've got the 3.73 gears on my truck. Yeah, I saw the Cooper 305s weighed in around 68lbs a piece vs the stock 275s at around 40lbs a piece. So, I'd be adding about 120 lbs extra to the truck to roll around.