Upsizing tires (285/65/20 or 34.6" tall) - Does *Anyone* regret 35's, go back stock? - Dodge Cummins Diesel Forum
2013-2018 General Discussion General Chit Chat About the 2013 model year differences 6.7L 4th generation Cummins - NO ADVERTISING - Sponsored by: StarLite Diesel

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post #1 of 32 (permalink) Old 12-06-2019, 09:06 AM Thread Starter
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Upsizing tires (285/65/20 or 34.6" tall) - Does *Anyone* regret 35's, go back stock?

I've been agonizing over this for a while now, partially because in my 30's I've become the "if it aint broke don't fix it guy" - but I'd like a little more "attitude" than the smooth walled Firestone Transforces give -

I have a buyer for them at $300 with 8k miles so its not like they are going to waste, and I've decided on the Cooper AT3 XLT due to many factors including great reviews on here, and their weight is very little compared to other 35's and others in their size. Adds exactly 5lbs per tire vs the Firestones in the size I chose, which is 285/65/20, a compromise between not adding any width, and adds exactly 1" in height.

I also got a great deal from Discount Tire's price match, the Coopers actually dropped about $30 before Thanksgiving, plus I had 7% off price matched for Black Friday/Cyber Monday, so they honored them at $275 a tire for me which is pretty decent considering the size.

My rpm worries were eliminated as its 3.3% less so nothing too crazy, I shouldn't feel much lugging because of the low weight compared to some 35"-37" mud tires adding 20-25lbs, etc. I have AlfaOBD to configure the speedo which should be about 2.5mph off at 70 with the new size.

Is there anything I'd regret to "going bigger"? If it rubs at full lock I would be super pissed, but I can't imagine that Ram designed the tire clearance so tight that a half inch taller radius tire is going to rub, they had to have built in more clearance than 1/2" (again, this size isn't any wider, and its not a mud tread that has huge lugs making it wider than the specs)

I get it that for off road etc thats a different story but for strictly on-road driving I can't imagine going up this small in tire size would rub, but I'll keep you guys posted. Just wondering if anyone hated upsizing their tires to 35's so much that they went back to stock size and were happier.


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post #2 of 32 (permalink) Old 12-06-2019, 10:07 AM
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I'm happy with my 295/60r20 falken tires. Fit perfectly and the don't look to skinny. Coopers run smaller and are light weight tires so the size you want will be fine
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post #3 of 32 (permalink) Old 12-06-2019, 10:39 AM Thread Starter
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Thanks man - your posts are super helpful! I saw your pics of the Falkens and they look great - the 285/65 was actually a decent amount less per tire, I got DT down to $300 per tire in the 295/60 but thats about as affordable as that size gets -

I can't imagine it would make the difference but the .7" difference max in height between my size and yours between rubbing at full lock (that would be 3/8" radius in height towards the radius arm/sway bar) - so much conflicting information but upsizing the tires and rubbing at full lock is my #1 concern. It would literally drive me nuts.

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post #4 of 32 (permalink) Old 12-06-2019, 10:54 AM
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I posted a while back on my experience going with larger tires. Your needs and/or opinions may differ.

Loved the looks, completely regretted my decision, see near the end of the discusscion (it was a short discussion).

https://www.cumminsforum.com/forum/4...ry-wheels.html
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post #5 of 32 (permalink) Old 12-06-2019, 11:44 AM
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i totally regretted going to a 34ish tire. As I'm now in my 40s, I want something to actually be what I expect it to be.

In my case it was 285/75R18s (the math says 34.8") and they barely look different than stock - by no means a true 35. Doing the math on metric sized tires will always leave you disappointed because nothing actually measures up. Also, these trucks make 37s look small.

Speedo correction is nice to have. I spent 2 decades doing the mental math on anything from 10-20% error. I used a Hypertech on this truck and my brand new 37s are programmed at 36.25" to get it accurate, confirmed by GPS. So again, nothing measures up.

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post #6 of 32 (permalink) Old 12-06-2019, 11:53 AM
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I up-sized to 35 x 12.5 when the new BFG KM3's came out and I love them. I got a crazy good deal because of a warranty issue with the KO2's. Zero rubbing and not crazy loud on the highway. Although, I will most likely switch to the Toyo Open County R/T's next as the inner old man in me wants a smoother ride, better MPG and a lil better tread life.

Next up Thuren Coils, Fox Front Shocks, and Thuren Rear Track bar.
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post #7 of 32 (permalink) Old 12-06-2019, 12:45 PM
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my Cooper AT3 XLT's rub at full lock on factory rims.

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2012 3500 SRW Crewcab LWB 4X4 Auto 6.7 HO stock
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post #8 of 32 (permalink) Old 12-06-2019, 12:48 PM
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What size Coopers on your factory rims?
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post #9 of 32 (permalink) Old 12-06-2019, 01:26 PM Thread Starter
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Quote:
Originally Posted by bfs673 View Post
I posted a while back on my experience going with larger tires. Your needs and/or opinions may differ.

Loved the looks, completely regretted my decision, see near the end of the discusscion (it was a short discussion).

https://www.cumminsforum.com/forum/4...ry-wheels.html
Thanks for refreshing me! I just re-read your thread - I don't tow so hopefully I won't regret my decision - I have heard yes they will squirm a bit until break-in

The good news is the Coopers have a 45-day money back guarantee so if I do regret the "upsize" I will go back down to stock size, a more aggressive tread may be enough in the stock size - you will notice more fuel economy hit if your speedo isn't recalibrated as well.

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post #10 of 32 (permalink) Old 12-06-2019, 01:57 PM
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Had 275/65r20 ridge grapps and they looked good plus they are even cheaper in that size. I have also had the ridge grapper in 295/60r20 and 295/65r20 and had no rub. Also had terra graps in 305/55r20 on 20x9+18 and no rub. This is all on my 18 2500. So far I like the falks best, look good ride good and smooth. I'm running 35psi rear and 50psi front unloaded. Heck I've sold about 6 set in the last two weeks and so far everyone likes them.
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post #11 of 32 (permalink) Old 12-06-2019, 02:40 PM
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Quote:
Originally Posted by Ricky_Bobby View Post
Thanks for refreshing me! I just re-read your thread - I don't tow so hopefully I won't regret my decision - I have heard yes they will squirm a bit until break-in

The good news is the Coopers have a 45-day money back guarantee so if I do regret the "upsize" I will go back down to stock size, a more aggressive tread may be enough in the stock size - you will notice more fuel economy hit if your speedo isn't recalibrated as well.
Although I stayed stock size, I went to the Toyo AT2's. But I have been over getting oversized tires now for many years. I tow heavy, and I don't want to sacrifice anything, and thats all that will be accomplished is sacrifice in performance mileage etc. with oversized tires

I see you have the Cummins, just curious what one does with a diesel if not towing.
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post #12 of 32 (permalink) Old 12-06-2019, 03:08 PM
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How is it that so many different stories when discussing the same tires and size? Some claim absolutely no rub and yet others say they do rub when turned. 285/65/20 are the same width on factory rims just an inch taller.
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