Recommendations for wheels and Tires? - Page 2 - TundraTalk.net - Toyota Tundra Discussion Forum

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post #16 of 22 (permalink) Old 10-25-2017, 10:35 AM Thread Starter
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Installed and Loving them thanks again @rruff .
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post #17 of 22 (permalink) Old 10-25-2017, 11:20 AM
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Looks great! Tundras really need bigger tires.

Any rubbing at compression? What did you do to make clearance?


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2016 SR DC Long 4x4 5.7L. Intermittent wipers added (?!). MB TKO 18x9 +25. Hankook Dynapro ATM 325/65r18 (34.6x13) Future Offroad RV plans: Bed removed, homebuilt camper installed. Rear seat removed to make room for storage and bikes. King or ADS shocks with 700 lb springs, ~2" lift (may cheap out though). Rear leaves, maybe air bags. And more!
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post #18 of 22 (permalink) Old 11-13-2017, 12:11 PM Thread Starter
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Originally Posted by rruff View Post
Looks great! Tundras really need bigger tires.

Any rubbing at compression? What did you do to make clearance?
Totally agree the truck looks so much better now.

Driving around a couple weeks now there is a little rubbing on the back of the front bumper/wheel well trim but it is very slight only when the wheels are sharply turned, if I have time I might play around with it this weekend should not be hard to fix. when I was doing my breaks right before the install I removed the front mud flaps was all the clearing I did.

I have not done anything to compress my suspension yet but, I think the rubbing issue on the back of the front bumper will get worse when compressed.

I will say that my MPGs took a sharp nose dive going from 34's to 35's plus I think I am 2 inches wider than stock too. So it is definitely time to re-gear I am hoping to get it done in the next few weeks working as much OT as I can to pay off the wheels/tires first (Was planning on doing it next year but I have to fill up twice a week now just to go to and from work and I am driving to CA for Christmas.)

looking at Yukon 4:88's but it would be about $1,800.00 in parts alone, set of gears X2 master rebuild kit X2 and probably about $700.00 in labor (would love to do it my self but being that its my DD I can't afford to have it out of commission for a week or two as I learn/get all the right tools.) hoping that I can maybe get away with just one rebuild kit for now because I would like to add a locker in the rear diff in the future.

But on the plus side my exhaust from Dirty Deeds came in so that is this weekends project
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post #19 of 22 (permalink) Old 11-13-2017, 12:59 PM
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I will say that my MPGs took a sharp nose dive going from 34's to 35's plus I think I am 2 inches wider than stock too.
It isn't the size, but the tires. Thick gnarly tread and stiff casings suck the gas. Wide is actually better for rolling resistance. I haven't noticed any drop in MPG with mine compared to stock Bridgestones, though there is probably a little drop. The Procomps ATs must have a lot of resistance.

I see you had 275/65r20 before. What model?


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post #20 of 22 (permalink) Old 11-21-2017, 12:44 PM
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Originally Posted by rruff View Post
Is it a 4.5" drop bracket lift (vs a strut spacer)?



295/70r18 (~34.3x12.0)
285/75r18 (~34.8x11.7)
305/70r18 (~35.1x12.6)
35x12.5r18(~34.6x12.1)
325/65r18 (~34.6x12.8)
I usually use the Tire Calc tool on the Taco forum and it is giving slightly different measurements than what you listed above. Specifically the 305/70 18 vs the 325/65 18.
https://www.tacomaworld.com/tirecalc...0r18-325-65r18

305/70r18 (~34.8x12.1)
325/65r18 (~34.6x12.8)

As I understand the tire measurements, the 325 and 305 refer to the width of the tread in mm. So a 325 is 20mm wider than a 305 (1in = 25mm) You list them as being only .2in different in width though.

I'm not sure on the accuracy of the TAco calc tool, and I know that every mfg has slightly different real-life dimensions for the same listed size... How did you come by your measurements though. The .2in diff still seems off to me intuitively, given the 305mm vs 325mm widths.
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post #21 of 22 (permalink) Old 11-21-2017, 01:19 PM
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You have to look at actual specs. For some reason the 305/70r18s trend bigger than their numbers would suggest. In my non-exhaustive survey the actual widths vary from 12.4-12.8" on a 9" rim. https://tiresize.com/tiresizes/305-70R18.htm

The width is casing width in mm (or inches), not tread. The casing width varies with wheel width. I read somewhere that 40% is a good ballpark. So if a tire is 12.5" on a 10" rim it would be ~12.1" on a 9" rim.

I spent way too much time browsing tires and noticed trends in discrepancies. Like the 305/70r18s being bigger than you'd expect. And 35" tires are typically ~34.6", and the 12.5" width is always on a 10" rim, while a wider tire like a 325/65 is measured on a 9.5" rim (and is nearly always 13.0" wide). So I normalized everything to a 9" rim.


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2016 SR DC Long 4x4 5.7L. Intermittent wipers added (?!). MB TKO 18x9 +25. Hankook Dynapro ATM 325/65r18 (34.6x13) Future Offroad RV plans: Bed removed, homebuilt camper installed. Rear seat removed to make room for storage and bikes. King or ADS shocks with 700 lb springs, ~2" lift (may cheap out though). Rear leaves, maybe air bags. And more!

Last edited by rruff; 11-21-2017 at 01:22 PM.
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post #22 of 22 (permalink) Old 11-21-2017, 01:55 PM
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Originally Posted by rruff View Post
You have to look at actual specs. For some reason the 305/70r18s trend bigger than their numbers would suggest. In my non-exhaustive survey the actual widths vary from 12.4-12.8" on a 9" rim. https://tiresize.com/tiresizes/305-70R18.htm

The width is casing width in mm (or inches), not tread. The casing width varies with wheel width. I read somewhere that 40% is a good ballpark. So if a tire is 12.5" on a 10" rim it would be ~12.1" on a 9" rim.

I spent way too much time browsing tires and noticed trends in discrepancies. Like the 305/70r18s being bigger than you'd expect. And 35" tires are typically ~34.6", and the 12.5" width is always on a 10" rim, while a wider tire like a 325/65 is measured on a 9.5" rim (and is nearly always 13.0" wide). So I normalized everything to a 9" rim.
That makes sense... thanks.
I knew that the Taco site was more "academic" than "real-world" which is why I asked. And yes... There is definitely a difference between Casing and Tread width. I've noticed some KO2's on 18x9 taper in a bit before the tread starts.
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