Tyres for my Dual-cab

Warren-Pat_01 · Guru

Tyres for my Dual-cab

watsea · Guru

Hi Warren,

I'm not helping with your specific question but there is a couple of tyre diameter calculation tools available. Though, you may have already used some of them.

Here is one: www.tempetyres.com.au/tyre-size-calculator

I used that site for the tyre sizes that you mentioned:
245/70/16 OD 749mm
255/65/17 OD 763mm
265/70/16 OD 777mm
255/70/16 OD 763mm
245/75/16 OD 774mm

At least you can see which of the sizes will have the most affect on the vehicle's gearing, which is important for when you are towing.

-- Edited by watsea on Sunday 14th of November 2021 01:40:55 PM

yobarr · Guru

Warren-Pat_01 wrote:
Hello everyone,
I'm closing my list of tyres that I'm going to fit to our D-Max in the next couple of weeks. Has anyone had dealings with the Kumho Venture AT51?
My short list at the moment is the Bridgestone Dueler 697LT (a respected tyre as I had three sets of them on our last GU Patrol), the Kumho, & the Falken WildpeakAT3W (although I don't think the now rating is required up here).
While some of you like Toyo - I have my reason for not including them, although I did run them once on my GQ Patrol.
When we bought the car, it came with 17" HT 255/65/17 tyres & due to being in isolated locations when friends with 17" wheels had difficulty getting replacements, I opted to go to 16" & of course the dealer did it the easy way of swapping the wheels with those off the (standard) LS-M car (245/70/16/111 - Bridgestone Dueler 693). So for the last 43,500kms I have been running with tyres that are 20mm smaller in diameter. It's probably brought my services on earlier than normal.
Due to the availability issue, I going to put the slightly larger 265/70/16 tyres on. Perhaps to correct the electronic odometer (which is correct with tyres 763-4mm diameter) next time I'll go to the 255/70/16 or 245/75/16 tyres - if I can get them!
This question is to gdayjr - why are some tyres rated to "LT" but most just show the Load Index of 117, upwards? The 697 Dueler shows both LT & 117.
Thanks.

Hi Warren.The difference in circumference between a 255/65 R17 tyre and a 265/70 R16 tyre seems to be only 33mm,or about 1.4%,so it is negligible.The 117 load index means the tyre is good for 1285kg,so all is good there,but I will never again use Bridgestone 697s,or even BFG KO2s,for that matter.Presently I have Mickey Thompson 265/75 R16s,and over 40,000km of towing 3500kg,a lot on outback dirt roads,with 2300kg on the car's rear axle,they've been great.Peter'n'Margaret seems to know a lot about tyres,so he may well give advice on LT rating,but unless you're running light,I suggest you stick with the 265/70 R16 instead of later changing to a smaller size.Cheers

-- Edited by yobarr on Sunday 14th of November 2021 03:33:38 PM

Warren-Pat_01 · Guru

Thanks Ted,
I hadn't used a formula - just got what I could from various brands' websites. Some are co-operative, some not.
Looking at the Falken site, their tyres are slightly larger in diameter & on further checking I found they have a greater tread depth (13.5mm) instead of the average 10-10.5mm. The B-S Dueler 693 tyres are 8-9mm.

Your calculation tool will be handy next time as I "reset" the instruments in the car. That's if we're not forced into electric vehicles by then!

watsea · Guru

Warren,
I just did some calculations trying to check that website's method. I am not a tyre expert.

They use:
Outer Diam OD = Rim diam in mm plus (2 x tyre width x tyre profile %)

eg for 245/70/16. (16inches = 406mm)
OD = 406mm plus (2x245x70%)
= 406mm + 343mm
= 749mm

I suppose tyre manufacturers may make their tyres to something slightly different so their data would be more accurate for new tyres.
As we know, tyres wear, so their diameters decrease.

iana · Guru

I have Kumho Road Venture AT/s, very happy with them.

Aus-Kiwi · Guru

Most speedos show faster than your traveling . Going by GPS . Its not my concern . Its having higher gear ratio on hills ! Depends on actual final drive ratio ? In my case its high enough already ! Some fit big tyres and find they lose performance!! Towing on hill especially!

yobarr · Guru

Aus-Kiwi wrote:
Most speedos show faster than your traveling . Going by GPS . Its not my concern . Its having higher gear ratio on hills ! Depends on actual final drive ratio ? In my case its high enough already ! Some fit big tyres and find they lose performance!! Towing on hill especially!

You're right,Graeme,although,in this case the difference is only 1.4%.Most speedos read around 5km/hr faster than actual speed,going by GPS,and the higher gear ratios certainly affect performance on hills,depending,of course,on how much engine power you have.For years people bleated and moaned about how the LC79 revved too high at 100 km/hr,so Mr Toyota eventually gave in,and fitted higher gears.All fine and dandy as a car,but the engine does not have enough power to successfully tow 3500kg in 5th gear now.Derrr.Always some expert trying to tell the manufacturer how to "improve" his product.Mate used my car to tow 1500kg camper trailer from Blacktown to Orange,all the way in top gear.Few cars would do that?Cheers

Aus-Kiwi · Guru

As they say now . A manual is good anti theft device . Yes what is wrong with dropping a gear or two and just holding a nice speed going up hills without killing engine ? With say ?? 1/3 throttle . Little chance of overheating . Most are so used to leaving it up to auto to make decisions!! But really if you have to explain ? Theres no hope !

Hewy54 · Senior Member

I was involved with a tyre business some years ago.
I had an 80 series and told our workshop manager to do his research and get the best tyres available for me - he put on BFG
Very happy with them so got another set - not happy with the amount of chipping.
Had a set of Coopers on my van when we got it - got rid of them quickly as they were delaminating (only 4 years old)
By this time I was out of the tyre game, but had a good mate with a Kumho dealership.
Asked him to put the best available on the van and the 80 series. He chose Mickey Thompsons Deegan 38 and also runs them on hid car and van.
Sold the car and got a BT50 that had a set of Kumho Road Venture AT51 - not happy with them - only got 50000 km out of them and lots of punctures. My Kumho dealer mate told me they were not relly suitable for much off road work.
Currently have a set of toyo Open Country and very happy with them.

Hope this helps

yobarr · Guru

Hewy54 wrote:
I was involved with a tyre business some years ago.
I had an 80 series and told our workshop manager to do his research and get the best tyres available for me - he put on BFG
Very happy with them so got another set - not happy with the amount of chipping.
Had a set of Coopers on my van when we got it - got rid of them quickly as they were delaminating (only 4 years old)
By this time I was out of the tyre game, but had a good mate with a Kumho dealership.
Asked him to put the best available on the van and the 80 series. He chose Mickey Thompson Deegan 38 and also runs them on his car and van.
Sold the car and got a BT50 that had a set of Kumho Road Venture AT51 - not happy with them - only got 50000 km out of them and lots of punctures. My Kumho dealer mate told me they were not really suitable for much off road work.
Currently have a set of Toyo Open Country and very happy with them.

Hope this helps

Hi Steve. Great to see that you're happy with your Toyos,as that is a brand that I have heard only good reports about,and which I was considering trying when the KO2s presently on the van expire.Way back,I liked BFGs,but like you,I have had problems with chipping,so I put those wheels on the van,and when they die I may try Toyos. Tried Coopers,but not happy,so I guess that it now will be a toss-up between Toyos and the Mickey Thompsons that I have on the car.They're not cheap,but mate,they're a magic tyre! Cheers

Warren-Pat_01 · Guru

Thanks for your replies.
I tried to get Kumho Venture AT51s but could only get 2 in Townsville - not good when I wanted 5! There are a high number on back order but I don't have time to wait.

As I said to yobarr, I reasons for not liking the Toyo, Firestone, Bridgestone 693 & others that have an outer rim that stabilizes the blocks of tread so with current catalogues available, I'm continuing with the tyres I had on my last Patrol - B/stone 697s. $300 is better in my pocket than someone else's.

If I was willing to take a chance, I think I'd get another 20,000kms out of the 693s but a possible blow out, accident is not worth it. And it is coming on to the wet season here now. Just this last week with some rain there have been a quite a few accidents due to wet roads & some wanting to drive like idiots!
Hewie, a lot depends on the weight of the vehicle with tyre life - with my last two Patrols, 50,000kms at highway speeds with heavy vehicles was good. As it was pointed out to me by a tyre retailer, there was probably another 10,000 left in them at town speeds but not out on the highways.

Thanks again peoples