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Open Roads Forum  >  Truck Campers

 > Which 19.5" tire to choose

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dedmiston

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Posted: 01/07/21 10:34am Link  |  Quote  |  Print  |  Notify Moderator

Grit dog wrote:

^Makes sense if you’re upgrading to a heavier rig.
More weight also = better traction. I’d be looking for basically any traction tread and have them siped. And ideally studded as you drive the coastal mountains.


I don't live near the snow, so I had to look up "sipe". Learn something every day. Very cool.

Do you do this on all your trucks G.D.?

https://www.lesschwab.com/article/performance-tire-siping.html


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Grit dog

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Posted: 01/07/21 11:59am Link  |  Quote  |  Print  |  Notify Moderator

^You know, never did, although I’d heard of it, until moving to western WA.
The snow here is super wet and thus it’s far more slippery than colder climates. It’s basically wet ice in the mountains as soon as it gets driven on.
Started doing it on mud tires because they don’t have any or few factory sipes.
But it even helps on AT or HT treads. Same concept as snow tires.
Generally the trucks that run over the passes in the winter, I sipe the tires.
Difference is night and day on mudders and it makes them not only good in deep/loose snow, with the big open lugs but helps the lugs grip the slippery stuff as well.
On AT tires which are like good at most conditions but not the best at anything, it’s also a noticeable improvement.

On any tires, especially heavier trucks, I don’t have them siped all the way out to the edges. That serves to wear out the shoulder treads much quicker. Just the inner tread rows and maybe halfway into the outer rows.
Depending how how drive and tire compound, it “can” decrease tire life, but on some tires I’ve seen as good as could possibly be expected so I don’t think it generally accelerates tread wear.

Also better traction dry and rain but not as pronounced as on snow.

Current personal rig has 37” mudders, not siped, and pulling the snowmobile trailer last week, even with nice low tire pressures on the truck, it got markedly worse traction than siped.


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Bedlam

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Posted: 01/08/21 05:36pm Link  |  Quote  |  Print  |  Notify Moderator

Siped tires will wear faster than solid blocks, but they do work well.


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jerryleejr

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Posted: 01/09/21 11:47am Link  |  Quote  |  Print  |  Notify Moderator

I know 19.5 are the default choice for upgrading weight capability. But I’m seeing 18” tire selections at almost 4K per tire now. What would going to 19.5” give me that the 18’s that are on the truck would not?
https://www.prioritytire.com/centennial-terra-trooper-a-t-lt-275-70r18-128-125s-f-12-ply-at-all-terrain-tire/

Grit dog

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Posted: 01/09/21 12:32pm Link  |  Quote  |  Print  |  Notify Moderator

Bedlam wrote:

Siped tires will wear faster than solid blocks, but they do work well.


I generally believe that to be true but had a set of Firestone MTs that were an anomaly. They still wore like iron being siped. I started using them year round and figured hauling the camper and trailer would accelerate the wear but I can’t imagine they could have held up any better not siped. It was strange.
Not siping the outer tread blocks helps as does the type of driving and load on the tires.
In heavy use I still expect exactly what you said though.
Cheers. Hope you guys had a good holiday!

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Posted: 01/09/21 12:34pm Link  |  Quote  |  Print  |  Notify Moderator

Quote:

What would going to 19.5” give me that the 18’s that are on the truck would not?

Looking at Fleet Ford specs show their 18"/20" wheels rated at 3590 lbs capacity.
I've never found any weight specs on Ram/GM same size wheels but I would bet their all close to the same load ratings. Now days its the wheels or possible rear spring pack that are the weak link in most pickups GAWR ratings.
Tire load capacity has over the wheels rating is a good idea but it sure doesn't mean the trucks OEM rear spring pack/wheels are good for the same load capacity.

19.5" wheels has more load capacity than OEM 18" or 20" wheels.

I would go by how much weight is on any trucks rear axle and choose tires and wheels with a good bit of reserve capacity.


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Grit dog

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Posted: 01/09/21 12:36pm Link  |  Quote  |  Print  |  Notify Moderator

jerryleejr wrote:

I know 19.5 are the default choice for upgrading weight capability. But I’m seeing 18” tire selections at almost 4K per tire now. What would going to 19.5” give me that the 18’s that are on the truck would not?
https://www.prioritytire.com/centennial-terra-trooper-a-t-lt-275-70r18-128-125s-f-12-ply-at-all-terrain-tire/


A 19.5 will give some advantages and a couple drawbacks comparatively.
Advantage of LT tires, softer sidewalls and the ability to run them as soft as you want.
Drawback, softer tire even when fully aired up.
Advantage of 19.5s, stiffer, better load control and tire wear.
Disadvantage. Always going to be rock hard and harsh when empty due to high min pressure requirement.

Rims are the other half of the equation. 19.5 wheels are rated higher and much stouter than all but a couple LT rims. And still better than those even.

Every thing is a compromise, right?

Grit dog

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Posted: 01/09/21 12:37pm Link  |  Quote  |  Print  |  Notify Moderator

Beat me to it Jim....lol

jerryleejr

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Posted: 01/09/21 01:10pm Link  |  Quote  |  Print  |  Notify Moderator

JIMNLIN wrote:

Quote:

What would going to 19.5” give me that the 18’s that are on the truck would not?

Looking at Fleet Ford specs show their 18"/20" wheels rated at 3590 lbs capacity.
I've never found any weight specs on Ram/GM same size wheels but I would bet their all close to the same load ratings. Now days its the wheels or possible rear spring pack that are the weak link in most pickups GAWR ratings.
Tire load capacity has over the wheels rating is a good idea but it sure doesn't mean the trucks OEM rear spring pack/wheels are good for the same load capacity.

19.5" wheels has more load capacity than OEM 18" or 20" wheels.

I would go by how much weight is on any trucks rear axle and choose tires and wheels with a good bit of reserve capacity.

I’ll look it up, wasn’t thinking about the rim rating with the 11.5k rear axel and 14k GVWR

JJ

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Posted: 01/09/21 08:06pm Link  |  Quote  |  Print  |  Notify Moderator

jerryleejr wrote:

I know 19.5 are the default choice for upgrading weight capability. But I’m seeing 18” tire selections at almost 4K per tire now. What would going to 19.5” give me that the 18’s that are on the truck would not?
https://www.prioritytire.com/centennial-terra-trooper-a-t-lt-275-70r18-128-125s-f-12-ply-at-all-terrain-tire/


My stock 18s on my 2006 F350 had tires that were rated 3760. I wouldn’t personally be worried about upping those to 4K. Maybe you are over the wheel rating, but that’s not much.


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