What % larger are 275-55/20s than 265-50/20? - Jeep Garage - Jeep Forum

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Old 06-11-2016, 06:58 PM
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What % larger are 275-55/20s than 265-50/20?

I had finally decided to go with the BFG AT KO2s. I found a good deal on them at Costco, but they won't install anything over 3% larger tires, company policy.

I know from other threads that they fit but, has anybody calculated the percentage that the BFGs are oversized?

Thanks in advance
SteveO

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Old 06-11-2016, 07:45 PM
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Re: What % larger are 275-55/20s than 265-50/20?

265/50R20...30.5" tall, 10.4" section width
275/55R20...31.9" tall, 10.8" section width

30.5 x 3% = 0.915
30.5 + 0.915 = 31.415
You would be taller than 3% by about a half inch.
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Old 06-12-2016, 07:03 PM
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Re: What % larger are 275-55/20s than 265-50/20?

guy at Discount tire tried telling me 275/55s would rub...i just laughed
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Old 06-12-2016, 09:09 PM
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Re: What % larger are 275-55/20s than 265-50/20?

Quote:
Originally Posted by SteveO90290 View Post
I had finally decided to go with the BFG AT KO2s. I found a good deal on them at Costco, but they won't install anything over 3% larger tires, company policy.

I know from other threads that they fit but, has anybody calculated the percentage that the BFGs are oversized?

Thanks in advance
SteveO
A quick google search will turn up a tire size calculator that will give you all the specs. The larger tire is 4.9% larger in circumference (your speedo will read 4.9% low), and 1.5" taller.

The one thing I guarantee you will notice going oversize like that, but isn't always considered, is that the Jeep will be noticeably slower accelerating and you will likely also notice the increased weight of the tires in the handling and ride. Just something to keep in mind.
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Old 06-15-2016, 01:09 PM
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Re: What % larger are 275-55/20s than 265-50/20?

The sales guy at my local Mom & Pop tire shop said to check on the forums about that very same issue. You are the first post I've seen mention it, thank you! I was hoping that the torque on the diesel would be enough to compensate for the bigger tire size. Any comments from other diesel owners out there?
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Old 06-15-2016, 02:51 PM
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Re: What % larger are 275-55/20s than 265-50/20?

Quote:
Originally Posted by SteveO90290 View Post
The sales guy at my local Mom & Pop tire shop said to check on the forums about that very same issue. You are the first post I've seen mention it, thank you! I was hoping that the torque on the diesel would be enough to compensate for the bigger tire size. Any comments from other diesel owners out there?
The torque helps, but you are effectively lowering your final drive ratio by 5% compared to stock sized tires. So, it would be like going from a 3.45:1 to 3.27:1. Will you notice it? Yes. Will you care? Well, that it personal preference, but be prepared to live with it until you wear out the tires.

From my experience, I would not go bigger. I did it on some GM's I had in the past and while it may have looked better, it DEFINITELY affected acceleration, handling and braking.

YMMV.
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Old 08-27-2016, 12:24 PM
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Re: What % larger are 275-55/20s than 265-50/20?

Quote:
Originally Posted by SteveO90290 View Post
The sales guy at my local Mom & Pop tire shop said to check on the forums about that very same issue. You are the first post I've seen mention it, thank you! I was hoping that the torque on the diesel would be enough to compensate for the bigger tire size. Any comments from other diesel owners out there?
I haven't noticed much of a difference in acceleration. Personally, I like the taller tire. They protect those nice rims a whole lot better, especially on trails, but also against curbs. In my experience, only drivers who look for top acceleration runs might possibly notice a difference. To date I have put 20,000 miles on the 275/55-20s, after putting 25,000 on the 265/50-20s.

For my next tire I'd like to keep the roughly 32" OD but go with a narrower tire, if one is made in A/T tread. I'll have to search to see if there's an option out there. I like my OEM 20" wheels so far, I like their clean and simple 5-spoke design, and want to keep them.
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Old 08-27-2016, 01:53 PM
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Re: What % larger are 275-55/20s than 265-50/20?

I have not noticed a big difference in acceleration as well. I have the 275/55/20 K02s and are very happy with them. I also installed a sprint booster though... that made the car feel quicker.


Costco in Canada wouldn't even let me order the tires because they were not OEM size..... right.
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Old 09-09-2016, 10:50 AM
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Quote:
Originally Posted by Sibze View Post
I have not noticed a big difference in acceleration as well. I have the 275/55/20 K02s and are very happy with them. I also installed a sprint booster though... that made the car feel quicker.

Costco in Canada wouldn't even let me order the tires because they were not OEM size..... right.
Do you have to recalibrate the tpms when going to a 275/55/20?
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Old 09-09-2016, 12:02 PM
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Re: What % larger are 275-55/20s than 265-50/20?

Never mind lol just had them put on and tpms fixed themselves.
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Old 09-09-2016, 12:09 PM
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Re: What % larger are 275-55/20s than 265-50/20?

Quote:
Originally Posted by SteveO90290 View Post
I had finally decided to go with the BFG AT KO2s. I found a good deal on them at Costco, but they won't install anything over 3% larger tires, company policy.

I know from other threads that they fit but, has anybody calculated the percentage that the BFGs are oversized?

Thanks in advance
SteveO
I use this calculator when i'm comparing tires

https://www.tacomaworld.com/tirecalc...0r18-255-70r18

Obviously you will need to input your tires sizes....
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Old 09-09-2016, 02:08 PM
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What % larger are 275-55/20s than 265-50/20?

Tiresize.com is another calculator to try. It's free and it gives you a visual comparison between two sizes, as well as a calculated speedometer error.
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