3rd Gen actual sidewall OEM vs 275/65/20

I am stuck in analysis paralysis. I want more sidewall without a ton more total weight.

I have the stock TRD 20" 265/60's. No lift, stock TRD Limited.

Theoretically, they have 6.26" of sidewall and are 32.5". I want more sidewall for local trails to give some air down potential. Going down to an 18 is high on wish list, but I need wheels and tires.

I can get a 34" with 275/65/20 with 7" sidewall or 33" with 275/70/18 with 7.6" sidewall. Going to18's nearly doubles cost for about a half inch of sidewall.

So I measured my 265/60/20's and they look closer to 31" and 5 1/4" sidewall measured at top. 5 -> 7" of sidewall staying on 20's seems better all of a sudden; just 4 tires.

Can anyone else with OEM faulkens measure and see if theirs are similar?

Anyone with 275/65/20's have a moment for a similar measure of sidewall?


(Apologize for typeos, on a bumpy flight)

 

My OEM Falkens are 5 3/8 sidewall and 31 3/8 overall diameter. Inflated to 37 with 5000 miles on them.

 

The problem you’re going to have is you’re comparing nominal measurements (265/60 etc) to actual measurements. You found the difference in your own tires already.

Now, add in the variability of different tire manufacturers *actual* measurements vs their nominal measurement that they are selling/marketing.

It sounds like you’re overthinking this based on your intended use case. If it truly is just “some local trails” (beach sand whatever) as a means to a destination (to go surf / fish / camp etc) then buy the tires you want in the size you want, drop 15psi when you go out there and you’re gonna be fine.
If your intent is to wheel the truck just to wheel the truck, then you might want to consider 18s. Or 17s. Guys who wheel 20” wheels (and there aren’t many for a reason) are probably running 37” tires too.

 

Oh, I am overthinking it.
With plenty of influence from my wallet and buddy with 35's on 18's. I've already taken the OEM on a few trails and survived. Comfort wasn't great, so I'd like to improve that.

And a lot of the basic places we surf, fish and camp all have a stock looking Prius pulled up. We did back off some stuff in Anza Borrego while watching the locals in their buggies cruise on by.

 

Thanks for confirmation. Once again, can't just go by what is on the ol' internet.

 

Right on. so, if your current rig made it everywhere you want go without incident other than some discomfort -

Cheapest option: buy the most rubber that fits on your stock wheels (20");

Not cheapest option: Go with 18s or 17's and the most rubber that will fit w/o lifting etc.

Tundras.com option: Full long travel, kings, clickers, bypasses, >37" tires, and maybe some snapped nipples (optional). Take a look at @reywcms @joonbug or some of the other BASTRDs et al for some serious build options.

 

1" = 25.4 mm so

265/60 = 60% of 265 mm = .60*265mm = 159 / 25.4 = 6.26" of sidewall thickness

You need 2 times the sidewall + the Rim = Circumference
2 * 6.26 + 20 =~ 32.5"

 

Yup, and when I actually measure the OEM 265/60/20's, they aren't close to those calculations. Is that just OEM cheating, or would a 275/65/20 cheat the same?