Tire size question

medic_84 · February 9, 2024

medic_84 · February 9, 2024

TrueBlue · February 13, 2024

On 2/9/2024 at 10:07 AM, medic_84 said:

The wheel size has nothing to do with it it is the overall diameter of the tire and wheel set up. You could go from a 17” with a swamper to a 26” with a rubber band around it and theoretically have the same over all diameter combination.

The stock setup on the truck I have now had a 30.1" diameter with 255/70R17's, while those I have on it now have a 33" diameter with 275/60R20's. Went up 3" with no changes whatsoever to the truck. No rubbing.

The wheel size does factor in. As does the width and profile of the tire. The 50/60/70/75 etc, is the percentage of the width of the tire that becomes the profile. So all three dimensions factor in.

The OP said, "

Posted January 19

I have a 2022 refresh Silverado 5.3 4wd. My stock tire size that came on the truck is 275/60/20. What I would like to do is upgrade to 275/65/20. It is approximately a little over an inch taller than my stock tires. Would I be able to do this without lifting the front "

Tire width, and wheel diameter remained the same between both sets.

All he was doing was changing the profile of the tire by 5%, everything else was the same.

His tires had a width of 10.83" on both sets.

The profile of the first set was 6.5"

The profile of the second set was 7.02".

So, his second set was roughly 1.1" taller than the first. Don't think that would matter much

medic_84 · February 14, 2024

On 2/13/2024 at 9:20 AM, TrueBlue said:

The stock setup on the truck I have now had a 30.1" diameter with 255/70R17's, while those I have on it now have a 33" diameter with 275/60R20's. Went up 3" with no changes whatsoever to the truck. No rubbing.

The wheel size does factor in. As does the width and profile of the tire. The 50/60/70/75 etc, is the percentage of the width of the tire that becomes the profile. So all three dimensions factor in.

The OP said, "

Posted January 19

I have a 2022 refresh Silverado 5.3 4wd. My stock tire size that came on the truck is 275/60/20. What I would like to do is upgrade to 275/65/20. It is approximately a little over an inch taller than my stock tires. Would I be able to do this without lifting the front "

Tire width, and wheel diameter remained the same between both sets.

All he was doing was changing the profile of the tire by 5%, everything else was the same.

His tires had a width of 10.83" on both sets.

The profile of the first set was 6.5"

The profile of the second set was 7.02".

So, his second set was roughly 1.1" taller than the first. Don't think that would matter much

My statement is still true. the diameter of the wheel has nothing to do with the tire size. He said he went from a 17” wheel to a 20” wheel and gained three inches …… the wheel had nothing to do with it. The difference in tire ratios did. I understand completely how aspect ratios work on tires. My statement was also that I went from a stock 275/60R20 (32.99 x 10.99 inches per Goodyear) to a 275/65R20 (34.09x10.98 inches per Nitto) the Nittos are the recon grappler. My stock Slt was lifted 2” in front and had 1/2” wheel spacers on stock 20” Slt wheels and I rubbed the fender liner, leading to it needing to be altered …. So everyone can speculate all they want but I speak from experience I doubt a 275/65 tire will fit a non at4 or trail boss truck with out modifications

TrueBlue · February 16, 2024

Actually he said he wanted to go from a 275/60/20 to a 275/65/20. No change in wheel size.

However, to go from a 17" wheel to a 20" wheel does indeed add more height to the diameter. At 1.5" top and bottom. Now you could say that is not the wheel but rather the tire, since you could not mount a 20" tire on a 17" wheel, of course the wheel does factor into the total heighth. Or the tire does, your choice. But one is not possible without the other.

Now in his case, when you use the actual tire sizes he provided, as I said by changing the profile by 5% he added a total of 1.1" to his diameter, half on the bottom and half on the top. Pretty much negligible on a truck.

In my case by going with a 3" larger wheel and fatter tires I added all of that 3" in diameter. And I had to do nothing to my truck to have them fit, turn, and travel without contacting the hard parts.

medic_84 · February 17, 2024

17 hours ago, TrueBlue said:

Actually he said he wanted to go from a 275/60/20 to a 275/65/20. No change in wheel size.

However, to go from a 17" wheel to a 20" wheel does indeed add more height to the diameter. At 1.5" top and bottom. Now you could say that is not the wheel but rather the tire, since you could not mount a 20" tire on a 17" wheel, of course the wheel does factor into the total heighth. Or the tire does, your choice. But one is not possible without the other.

Now in his case, when you use the actual tire sizes he provided, as I said by changing the profile by 5% he added a total of 1.1" to his diameter, half on the bottom and half on the top. Pretty much negligible on a truck.

In my case by going with a 3" larger wheel and fatter tires I added all of that 3" in diameter. And I had to do nothing to my truck to have them fit, turn, and travel without contacting the hard parts.

I am glad you like speaking to people

like they are idiots.
Yes you went from a 17” to the 20” but the 20” you went to is the stock size he has now. He wants to go bigger.

Wheel size has NOTHING to do with over all diameter of the tire. Yes you have to have a wheel to mount the tire to but the diameter of that wheel has no bearing on the over all diameter of the tire. The width and aspect ratios are what determine the over all diameter of that tire. Back to statement I made before . Theoretically you could have a 15” rim with a 35x12.50 super swamper on it and a 26” wheel with a super low profile tire and the 26” wheel and tire combo may not be any bigger around than the 15” one. The stock 275/60/20 on the non AT4 and Trailboss trucks have very little wiggle room. I am speaking from experience and even posted pictures of the very tire he wants to put in and listed what I had to do to the truck to have the tires fit and yet you still want to argue with me about it and tell me I am wrong.

Edited February 17, 2024 by medic_84

TrueBlue · February 17, 2024

I had no idea you felt like an idiot. If so, it's not my doing, and I had no intent to make you feel like one. But we are definitely not seeing things the same. Maybe I'm the idiot?

A 245/60R17 tire and a 245/60R20 tire do not have the same diameter. Both have the same width and profile, however the 20 is going to be taller, (from the ground to the top of the tire), because it has to fit around the 20" wheel. Right?

The OP said he wanted to go from a 275/60/20 to a 275/65/20. Same width, same wheel size, profile increases by 5%. No issues in mounting or using on a truck.

medic_84 · February 18, 2024

9 hours ago, TrueBlue said:

I had no idea you felt like an idiot. If so, it's not my doing, and I had no intent to make you feel like one. But we are definitely not seeing things the same. Maybe I'm the idiot?

A 245/60R17 tire and a 245/60R20 tire do not have the same diameter. Both have the same width and profile, however the 20 is going to be taller, (from the ground to the top of the tire), because it has to fit around the 20" wheel. Right?

The OP said he wanted to go from a 275/60/20 to a 275/65/20. Same width, same wheel size, profile increases by 5%. No issues in mounting or using on a truck.

I do not feel like an idiot because I know what I am talking about. You keep speaking to me like I don’t. I know you keep saying it is only a 5% increase but on a non at4 or Trailboss truck it will rub. The reason the example you gave factors in to the 20” being taller is the width of those tires are 245mm so they would be the same width. The sidewall height would be 147mm (60%) of the width. So yes if you add the 147 mm side wall to a 20” wheel vs a 17” wheel then the 20” wheel and tire would be taller. But your statement of the wheel being the same so it has to fit is not correct. And yes you said you went from a 17” wheel and tire to a 20” wheel and tire which yes was bigger but again is the stock size. If the op had an AT4 which he does then the tire would fit. But on his stock truck it will not fit with out rubbing.

TrueBlue · February 18, 2024

Not saying that just because the wheel is the same they have to fit. In his case the wheel size and tire width are equal, but the profile of the setup he's going to is 5% more than his original. His original profile height is 6.48". Where he wants to go is a profile that is 7.04". That equates to .56" taller, top and bottom. Or 1.12" taller, total. Same wheel size before and after, therefore the total increase in the diameter of the tire is 1.12".

My height increase was 3.3", and fits fine. No rubbing, no bottoming out. His would too at one third of that, unless I've missed something. Which is possible. But I don't think so.

medic_84 · February 18, 2024

1 hour ago, TrueBlue said:

Not saying that just because the wheel is the same they have to fit. In his case the wheel size and tire width are equal, but the profile of the setup he's going to is 5% more than his original. His original profile height is 6.48". Where he wants to go is a profile that is 7.04". That equates to .56" taller, top and bottom. Or 1.12" taller, total. Same wheel size before and after, therefore the total increase in the diameter of the tire is 1.12".

My height increase was 3.3", and fits fine. No rubbing, no bottoming out. His would too at one third of that, unless I've missed something. Which is possible. But I don't think so.

Yes! You have missed ALOT!!! You have missed the fact that the 275/60R20 you went to is the stock size he has. Regardless of how much bigger it is than what you had it is still his stock tire. You have also missed that you yourself have said the tire he wants to go to is 1.12” taller or .6” on either side. You have also missed that I put the tire size he wants to put on his truck on my truck and it rubbed. You missed that I had to lift the front of the truck 2” and modify the fender liners to prevent rubbing. Also what you have missed is the 255/70R17 tires you had previously measured 31.09 inches tall and the 275/60R20 you went to measure 32.99 inches tall which is a difference in height of 1.9 inches not the 3 inches you have been claiming. Yes the wheel is 3” bigger but the combo is not. So again I suppose you can continue to argue with me or you can acknowledge you have NOT put the tire size on your truck that he asked about and acknowledge that I may know what I am talking about because I have in fact done the very thing he is asking.

Transient · February 18, 2024

Gotta love this petty fighting. What garbage! Wtf do the GMC owners think their answer matters in the first place? The question is regarding a Silverado. Yes, mechanically they are the same truck. Cosmetically they aren't. Tire sizes are affected by the cosmetic features of these trucks, such as fenders, air dams, wheel well liners, etc. With all do respect, the GMC owners should stay out of this one. The Chevy guys have it. Before you GMC owners get butt hurt about me telling you to sit down I'd like to share some evidence as to why you're wrong. This is just an example I pulled from a page I have been looking at often lately, but it's all over their website and various other sites too. There are more examples than just this where the 2 trucks can't use the same size tire. Straight from ReadyLift's website:

https://www.readylift.com/at4-trail-boss-plus-2-0-sst-lift-kit-gm-1500-at4-trail-boss-4wd-2019-2023.html

"AT4 - Max tire 305/55-20, 20x9 0 offset wheel

Trail Boss - Max tire 295/65-20, 20x9 0 offset wheel"

305/55r20 = 33.21" diameter, 12" width

295/65r20 = 35.1" diameter, 11.61" width

medic_84 · February 18, 2024

11 hours ago, Transient said:

Gotta love this petty fighting. What garbage! Wtf do the GMC owners think their answer matters in the first place? The question is regarding a Silverado. Yes, mechanically they are the same truck. Cosmetically they aren't. Tire sizes are affected by the cosmetic features of these trucks, such as fenders, air dams, wheel well liners, etc. With all do respect, the GMC owners should stay out of this one. The Chevy guys have it. Before you GMC owners get butt hurt about me telling you to sit down I'd like to share some evidence as to why you're wrong. This is just an example I pulled from a page I have been looking at often lately, but it's all over their website and various other sites too. There are more examples than just this where the 2 trucks can't use the same size tire. Straight from ReadyLift's website:

https://www.readylift.com/at4-trail-boss-plus-2-0-sst-lift-kit-gm-1500-at4-trail-boss-4wd-2019-2023.html

"AT4 - Max tire 305/55-20, 20x9 0 offset wheel

Trail Boss - Max tire 295/65-20, 20x9 0 offset wheel"

305/55r20 = 33.21" diameter, 12" width

295/65r20 = 35.1" diameter, 11.61" width

Not quite garbage and not exactly petty. I will concede that I am a GMC owner and can only speak to my experience. My issues lie with other people’s reasoning as to why they are right bypassing all of the evidence pointing to the statements I have made regarding gmc trucks true…… there was a fella on this post who asked me about a 1.5” lift on his elevation and clearing the tire size in question. Then you have this Trueblue a-hole buts in and spouts all kinda nonsense about going from a 17” to 20” rim and that being a 3” increase in size so it must work…… yada yada yada…… I have never claimed to know about Silverados but I did assume it was close.
For that I apologize!

TrueBlue · February 18, 2024

Not an a-hole. And I still believe what I said to be true. However you were right in that I misstated my own experience, specifically that my tire size increased by 3", when in fact it was as you stated 1.9". Not intentional, just a lapse in memory. But, even at just the 1.9" increase in my case, which went off without a hitch on my truck, why then would the OP who was only going 1.12" on the same model as me, not be able to do the same? Or perhaps my increase had me at the limits of tire size increase, and his would put him over that limit? Not sure, but given that the High Country (as well as Silverados), can come with 22" wheels on it from the factory, I doubt another 1.1" on his truck would require a 2" lift.

Regardless, you should try to avoid the keyboard commando tactics. I've been nothing but polite here, even allowing that I myself was making a mistake on what I was saying, which I was and admitted to. You should do the same. We're all here to learn, and then give back when possible. At least those are my reasons. YMMV

medic_84 · February 18, 2024

55 minutes ago, TrueBlue said:

Not an a-hole. And I still believe what I said to be true. However you were right in that I misstated my own experience, specifically that my tire size increased by 3", when in fact it was as you stated 1.9". Not intentional, just a lapse in memory. But, even at just the 1.9" increase in my case, which went off without a hitch on my truck, why then would the OP who was only going 1.12" on the same model as me, not be able to do the same? Or perhaps my increase had me at the limits of tire size increase, and his would put him over that limit? Not sure, but given that the High Country (as well as Silverados), can come with 22" wheels on it from the factory, I doubt another 1.1" on his truck would require a 2" lift.

Regardless, you should try to avoid the keyboard commando tactics. I've been nothing but polite here, even allowing that I myself was making a mistake on what I was saying, which I was and admitted to. You should do the same. We're all here to learn, and then give back when possible. At least those are my reasons. YMMV

I have no problem admitting when I am wrong see my above post where I concede not knowing anything about Silverados. What I am not wrong about is my experience with the size of the tire on a GMC and you insisting I am. Also to your logic of the Denali Ultimate 22” wheels and tires must be larger than the SLT because the SLT has 20” rims. Again you are wrong….. which shows how little you understand about tire and wheel sizes and how the wheel has little bearing on the over all tire size. The Denali Ultimate 22” wheel and tire combo has an overall height of 32.83” which actually is smaller than the 275/60R20 on the SLT….. wait what!!!! Say it isn’t so!!! But the wheel is bigger!!! Thank you sir for proving my point for me with your own example!

But your right my mileage may very.

I am not a keyboard commando until people on forums try to tell other people wrong information or unfounded information. Again I did concede that the original op was asking about a Silverado and I have a GMC as Transient pointed out and apparently there may be some differences in body panels that allow for different tire sizes. To that I have no knowledge.

Edited February 18, 2024 by medic_84