Thread: Tyre Advice 245 or 265/70 265/75?

Originally Posted by ozscott

I like the sidewalk height of 245/75 and a wheel that isn't too side (still 10mm wider than standard) and the fact that virtually all brands can be had in that size in Light Truck carcass.

Cheers

My bad, all the ones I am looking at are LT sizes. I was saving time by leaving off all the LT's in my post. So far I recon I've saved 5 seconds!

Originally Posted by PhilipA

I have BFG 255.70x16 on mine and am happy with them. No touching anywhere.
just check if your rims are 7 inch or 8 inch as you should not put 245 on 8 inch rims.

Also the 255.70 is now a common size as is stock on Ranger etc so you should be able to get out of trouble in Broome, and also remember that 255.70x16 Juuust fits on the spare tyre carrier without any mods.
Regards Philip A

Carrier & tyre cover...hadn't actually thought of that. Adding weight against 265

Originally Posted by John_D2

Thanks for the reply & pics. I guess the bigger the tyre the greater any issues get amplified also. I wonder if 245/70/16 is as big as a 'couple times a year' off roader needs to go. True, 265/75/16 will give me 1" extra lift, but maybe I could just pick an alternative path?!

In Victoria, you can only add 50mm to the diameter of your tyre from the factory size. 265/70R16 is about on the limit.

I am not a rock crawler or double diamond track runner, so I am yet to meet any terrain that a 31" can't handle. I need road sensibility as well as off-road safety and capability.

Originally Posted by John_D2

Carrier & tyre cover...hadn't actually thought of that. Adding weight against 265

265/70 fits my spare wheel carrier. I have a facelift model that came with 8" rims, so 245/70/75 no go as rim is too wide. Std fitment was 255/65 (same size as 235/70 fitted on 7" rims) on the 8" rims ... previous owner had 255/70 fitted. Good size. Going to 265/70 ended up being 1 size wider / 1 size taller. Better size (imho the limit if you tow with a std tune).

But but but 265/75's look so good !

and I keep telling myself I need that height under the diffs as I'm used to running 255/85's on the Deefer

(says he who's new D2 has near new 235/70 HT's atm)

[QUOTE=Fluids;. Better size (imho the limit if you tow with a std tune).[/QUOTE]

Better for towing than 245? Sorry don't understand.

Originally Posted by InMused

In Victoria, you can only add 50mm to the diameter of your tyre from the factory size. 265/70R16 is about on the limit.

I am not a rock crawler or double diamond track runner, so I am yet to meet any terrain that a 31" can't handle. I need road sensibility as well as off-road safety and capability.

Yep. I'm pretty sure you are only allowed 75mm lift in total consisting of a 1" (25mm) lift in tire (equal to 2" or 50mm large diameter tire) and 2" lift in suspension.

Originally Posted by John_D2

Better for towing than 245? Sorry don't understand.

The 245/75 & 265/70 are pretty much the same diameter.

245/75 = 30.47inches / 774mm
265/70 = 30.61inches / 777mm
0.39% difference

75% of 245mm = 183.75mm wall height
70% of 265mm = 185.50mm wall height

255/70 = 30.06inches / 763mm

235/70 = 28.95inches / 735mm
255/65 = 29.05inches / 738mm

Bigger the diameter the lower your engine revs for a given speed (in the same gear).

Engine revs too low ... engine doesn't develop as much power ... need to use more throttle ... takes longer to accelerate / get up to speed

For general driving & playing offroad the 245/75 265/70 & 265/75 seem to be good common choices ... but if your mainly towing (bigger loads) then a smaller 235/70 245/70 255/70 would be a wiser choice ... unless you get a tune for the ECU to add some extra ponies ... then the larger tyres will work ... for me (my opinion) the 265/70 I have are about the limit "with a std tune" for towing/touring (lacking occasionally) but get the job done ... my previous 255/70 would have been better but they were $75/tyre more (x5 tyres)

265/75 for towing (1.5-2t) with a std tune would imho be painful !! You'd need to be doing 110-120km/hr or more to get the engine revs high enough to develop enough horsepower to pull the load (in 4th locked) .... or spend alot of time in 3rd locked at high engine revs at 100km/hr (maybe 2800-3000rpm). With my current 265/70 setup 90km/hr (actual) is 2000rpm.

Take a look here *Alloy Wheel & Tyre Size Calculator you can plug in tyre sizes and do comparisons.