Thread: 19" Maxxis AT Tyres

I think one thing needs to be clarified here.
It is not that the rims/tyres are 19” that is the issue for anyone, it is the 55 profile of the tyres. If you were running 55 profile on 16”, 18” or 20” rims you’d still have the same issues. Yes, it’s a pity that there are no 60, 65 or 70 profile tyres for 19” rims, as that would incrementally solve our problem.
I still think that in general, lower speed (and pressure) is the answer in normal outback and single lane track travel. If it’s really gnarly then we’re exposed to sidewall cuts regardless. In LT (light truck) rated tyres, particularly All Terrain, and even more so with Mud Terrain tyres, the sidewalls are almost as tough as the tread.
The higher the pressure (harder the sidewall) the easier it is to cut. I do agree that with 55 aspect ratio tyres we do run the risk of rim damage but this doesn’t seem to be the problem people are reporting.

cheers
David

Originally Posted by Eric SDV6SE

About 5000 clicks on my AT’s, unfortunately not too much off roading, but a long weekend down at Pemberton and the Yeagerup NP including the sand dunes all the way to the beach and country dirt tracks, plus recently lots of highway driving and they are performing well. Heaps of grip in the wet, confidence inspiring.

For the highway i run 46psi cold all round, I end up around 50psi hot. Negligible noise but that’s because of the tread blocks. Even wear all round and so far no scalloping. Car tracks beautifully (I’ve never had a wheel alignment done in the 5 years I’ve owned it.)

ive rotated all tyres once about 2000 kms in, including the spare, so now they’re all scrubbed in.

will rotate them again in about 5000kms.

on on the beach I ran 25-28 if I remember correctly no issues at all.

so far I’m very happy with them.

hope this helps

Eric

I run 50psi on the highway when tyres are hot too. I was running about 35 psi according to the manual. However I did not feel right when driving on these Maxxis ATs.

One thing annoying me is that AT 980s are humming at 60km everyday. I can accept highway being noisy, but not city run.

You run 25 on beach, then I recon I should a bit higher on the rocky tracks.

Thank you, Mate.

Originally Posted by Odysseyman

I think one thing needs to be clarified here.
It is not that the rims/tyres are 19” that is the issue for anyone, it is the 55 profile of the tyres. If you were running 55 profile on 16”, 18” or 20” rims you’d still have the same issues. Yes, it’s a pity that there are no 60, 65 or 70 profile tyres for 19” rims, as that would incrementally solve our problem.
I still think that in general, lower speed (and pressure) is the answer in normal outback and single lane track travel. If it’s really gnarly then we’re exposed to sidewall cuts regardless. In LT (light truck) rated tyres, particularly All Terrain, and even more so with Mud Terrain tyres, the sidewalls are almost as tough as the tread.
The higher the pressure (harder the sidewall) the easier it is to cut. I do agree that with 55 aspect ratio tyres we do run the risk of rim damage but this doesn’t seem to be the problem people are reporting.

cheers
David

You are absolutely right, Mate. The low profile is the problem. Unfortunately, I didn’t take a photo of the cut and it has been replaced. But from what I can see, the cut is on the bulged part of the sidewall for sure. Before the incident, I actually discussed with other Mates about how terrible those rear tyres were bulged on 25/30psi.

3 of my maxxis have been on for 10k km & the 4th is new. Happy so far except for the fire hardened stick which destroyed a tyre in the Deepwater NP near Agnes Waters. See the pic where the hole is, a higher profile would have made no difference. Pressures were at 25psi because the sand was soft in places.

20181030_123150.jpg

Originally Posted by Odysseyman

It is not that the rims/tyres are 19” that is the issue for anyone, it is the 55 profile of the tyres.

Not quite correct, as the aspect applies to the section width. As an example, my 275/55R20 have sidewalls almost as tall as 255/60R18 and the reason why I use 20" on my L322 rather than 19". Perhaps more 255/60R19 (D5 size) will in time become available.

Originally Posted by Graeme

Not quite correct, as the aspect applies to the section width. As an example, my 275/55R20 have sidewalls almost as tall as 255/60R18 and the reason why I use 20" on my L322 rather than 19". Perhaps more 255/60R19 (D5 size) will in time become available.

I do see D5 has advantages on rims and tires.

Originally Posted by Graeme

Not quite correct, as the aspect applies to the section width. As an example, my 275/55R20 have sidewalls almost as tall as 255/60R18 and the reason why I use 20" on my L322 rather than 19". Perhaps more 255/60R19 (D5 size) will in time become available.

Hi Graeme,
Well, yes... I’m not sure I understand your point. The aspect ratio of 55 means the sidewall height is 55 percent of the section width.

By my calculation a 255/60 x19 tyre (if it was available) would have a sidewall height of around 153mm and your 275/55x20 will have a sidewall height of 151.25mm.
I reckon a 255/65x19 would be perfect at around 159mm, taller even than a 255/60x18.

I imagine that most guys running 18” rims would be using something bigger than a 255/60. I do know there is a statutory limit to the increase in tyre diameter. Maybe someone can tell us what the maximum increase is - I can’t remember...

At at the end of the day I reckon that most tyre failures, (of the good quality known brands) of light truck tyres a lot of us use, is just down to bad luck. There are way too many variables to point the finger at the tyres themselves.

As as an aside, there were General Grabbers on my previous Ford Ranger when I bought it. A couple of trips into the Vic High Country saw lots of chipping in the treads and I found them very slippery in the wet once around 3/4 worn. I swapped then for Cooper ST Maxx and never had a problem.

We’ve just had a weekend out east of Melbourne, through Warburton and Stockmans Reward and up Mt Terrible then down to Kevington. Not a mark on the Maxxis running 30 psi all round as an experiment.

Cheers
David

All of my sidewalk damages have been a rock squishing the tread between the rock and the rim. You can hear the clear thud of the rim in the vehicle. This results in a cut in the sidewall. Now I attribute a lot of that to shallow sidewalls and low pressure in most cases. Would higher pressure have helped? Unsure. Maybe the rock would have sliced it before it got to compress to the rim at higher pressure? Dunno.
As has been said, bad luck and poor line is a heavy contributor.