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post #1 of 8 (permalink) Old 02-15-2018, 09:45 AM Thread Starter
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TRD Package on 2018 Limited vs Standard Wheel Size

All,

I'm planning to purchase a 2018 CM Limited. There are two at the dealership - one with the TRD package, and one without. The TRD Package changes the wheels from a 20(275 55 20), to an 18 (275 65 18).

I'll be using the vehicle for towing a camping trailer 10 - 15 times a year, and then as a DD - mostly freeway.

I noticed that the tow ratings drop almost 1000 lbs when going from the SR5 to the Limited, and I figured it was the suspension change as well as the increased tire size (18 inch to 20 inch).

So here's the question for you all: Which vehicle do I purchase? Would the shorter, wider tire on the 18 be better, or the narrower but taller tire be better for the driving & towing I plan to do?
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post #2 of 8 (permalink) Old 02-15-2018, 10:00 AM
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275/65/18 = 32.075" x 10.8" wide x 7.037" sidewall height.

275/55/20 = 31.909" x 10.8" wide x 5.955" sidewall height.

Honestly they are so close you probably wouldn't notice a difference. The 20's obviously will have the shorter "more stable" sidewall, but the TRD package with the Bilstein's will have stiffer shocks, I'd be its pretty close to cancelling out when it comes to ride and stability. Most effective upgrade you could do to either truck would be to get a stiffer sidewall tire if you're really worried about what you're towing.


What are you towing?

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Last edited by riccnick; 02-15-2018 at 04:19 PM. Reason: I got the sidewall heights backwards....
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post #3 of 8 (permalink) Old 02-15-2018, 12:34 PM Thread Starter
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Originally Posted by riccnick View Post
275/65/18 = 32.075" x 10.8" wide x 5.955" sidewall height.

275/55/20 = 31.909" x 10.8" wide x 7.037" sidewall height.

Honestly they are so close you probably wouldn't notice a difference. The 20's obviously will have the shorter "more stable" sidewall, but the TRD package with the Bilstein's will have stiffer shocks, I'd be its pretty close to cancelling out when it comes to ride and stability. Most effective upgrade you could do to either truck would be to get a stiffer sidewall tire if you're really worried about what you're towing.


What are you towing?
Ok... so my brain just exploded. What?
You said the actual width would be the same at 10.8 inches? I thought the middle number was the width of the tire (55 vs 65)?
You also said the 20s will have a shorter "more stable" sidewall, but your math shows a 7.037 inch sidewall height, compared to a 5.955 inch for the 18?
I'm not smart when it comes to this stuff (that's why I'm trying to learn on this forum), so please help me understand.

As far as what I'm pulling - right now, It would be used to pull at 4500# bumper pull - later, I'll be upgrading to something larger (8000 - 9000 range).

Thanks in advance!
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post #4 of 8 (permalink) Old 02-15-2018, 01:07 PM
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Quote:
Originally Posted by Sam Talbot View Post
Ok... so my brain just exploded. What?
You said the actual width would be the same at 10.8 inches? I thought the middle number was the width of the tire (55 vs 65)?
You also said the 20s will have a shorter "more stable" sidewall, but your math shows a 7.037 inch sidewall height, compared to a 5.955 inch for the 18?
I'm not smart when it comes to this stuff (that's why I'm trying to learn on this forum), so please help me understand.

As far as what I'm pulling - right now, It would be used to pull at 4500# bumper pull - later, I'll be upgrading to something larger (8000 - 9000 range).

Thanks in advance!
The width of the two tires are the same--275mm. The discrepancy I see is that the sidewall heights are backwards. The 20s would have a shorter sidewall of 5.9" whereas the 18s would have a sidewall of 7". The second number is the aspect ratio of width to sidewall height.

Hope that helps!
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post #5 of 8 (permalink) Old 02-15-2018, 02:37 PM Thread Starter
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So are we saying that the overall height of these tires is the same? No overall height difference between the two tires (18 vs 20). It's just the amount of rubber on the sidewall?
If that's the case, is it safe to assume that the reason for the overall towing capacity between the SR5 and Limited is solely due to the difference in Suspension?
If that's the case, then is it safe to assume that with the TRD package, my overall towing capacity would increase to the same level as the SR5? (Because with the TRD package upgrade on the limited, I'm now riding on a SR5 suspension package)?
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post #6 of 8 (permalink) Old 02-15-2018, 04:21 PM
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I fixed my post, I got the sidewall heights mixed up. The first measurement in a metric tire is the tire's width, in millimeters. The second is the sidewall height, which is that percentage of the width. So 275mm X 55% = 151.25mm (5.955") sidewall. Double that (top sidewall and bottom sidewall) and add it to the rim diameter (20") to get the overall height = 31.909"

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post #7 of 8 (permalink) Old 02-15-2018, 04:23 PM
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Quote:
Originally Posted by Sam Talbot View Post
So are we saying that the overall height of these tires is the same? No overall height difference between the two tires (18 vs 20). It's just the amount of rubber on the sidewall?
If that's the case, is it safe to assume that the reason for the overall towing capacity between the SR5 and Limited is solely due to the difference in Suspension?
If that's the case, then is it safe to assume that with the TRD package, my overall towing capacity would increase to the same level as the SR5? (Because with the TRD package upgrade on the limited, I'm now riding on a SR5 suspension package)?
The difference in towing capacity is either due to the weight rating (read: capacity) of the 20" wheels, or the weight of the added features of the limited compared to an SR5. Also, make sure you're comparing DC to DC and CM to CM. CM trucks weigh more and tow less.

The TRD package used to add about 150-200 lbs to the truck, and reduced the tow capacity by the same amount. At least that was back when my truck was built in 2010. Most likely the Sunroof (if equipped), the leather seats, center console, and other content combined with the 20" wheels are the reason the Limited tows 1000 lbs less in Crewmax form and 900 lbs less in Double Cab form, compared to a non-TRD SR5 truck, per Toyota's website. They do not list capacities for TRD Off Road trucks on the website.

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Last edited by riccnick; 02-15-2018 at 04:48 PM.
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post #8 of 8 (permalink) Old 02-15-2018, 08:28 PM
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Go with the TRD; more tire for better wheel protection and I think you may have more tire options for the 18 inch wheel when you decide to replace.

2016 Crewmax Limited MGM with TRD and Ltd Premium pkg
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