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Old 12-22-2017, 06:12 PM   #1
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80 psi max or 65 psi max tires

Here's a question for the tire gurus of the group. Say you're interested in 2 E-rate tires from the same company. Both tires are the same size (35x12.50R18LT). One is rated with 80 psi max and the other is 65 psi max. Weight ratings are 3970 and 3420. So here's my question, is there any problem running 65 psi tires on an 8000 lbs van that tows up to 6500 lbs when E350's spec 80 psi tires? What are the pros and cons to it?
Thanks
Darryl
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Old 12-22-2017, 07:25 PM   #2
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You're fine. Only issue might be the TPMS lights.

Even the 65 psi tires are quite a bit more robust than the stock tires.
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Old 12-22-2017, 07:44 PM   #3
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Just make sure to run the tires at the proper pressure according to the recommended tire pressure or the vehicle weight, and not the maximum pressure on the tire.


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Old 12-23-2017, 03:04 AM   #4
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Originally Posted by depark View Post
Here's a question for the tire gurus of the group. Say you're interested in 2 E-rate tires from the same company. Both tires are the same size (35x12.50R18LT). One is rated with 80 psi max and the other is 65 psi max. Weight ratings are 3970 and 3420. So here's my question, is there any problem running 65 psi tires on an 8000 lbs van that tows up to 6500 lbs when E350's spec 80 psi tires? What are the pros and cons to it?
Thanks
Darryl
When understanding if a tire can handle a load, the load index/load rating is the single most most important thing. Check to make sure the new tire has the same or better load rating/load index. The second is the tire pressure.

The difference you're seeing is the difference betwee E1 & E2 tires. E2 (65psi max ) are flotation, E1 (80psi max) is your typical tire. There is also a D1 and D2 (65PSI & 50PSI)...

There have been load tables published for tires for years...

The information you seek is here.

https://www.toyotires.com/tires-101/...flation-tables

Actually, this is the doc...

https://toyo-arhxo0vh6d1oh9i0c.stack...s_20170203.pdf
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Old 12-23-2017, 08:08 AM   #5
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Depark, sorry if I missed it. What tires specifically are you comparing? I'm curious because I've never seen any e-rated tires that were 65psi, only 80psi.
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Old 12-23-2017, 05:47 PM   #6
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Originally Posted by 86Scotty View Post
Depark, sorry if I missed it. What tires specifically are you comparing? I'm curious because I've never seen any e-rated tires that were 65psi, only 80psi.
I have been looking at these 3 tires. They are all E-rated.

Toyo Open Country M/T 35x12.50R18LT 123Q 3420lbs 65psi
Toyo Open Country M/T 35x12.50R18LT 128Q 3970lbs 80psi
Mickey Thomson Baja MTZ P3 LT305/70R18 126Q 3750lbs 65psi

Cheers
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Old 12-25-2017, 09:34 AM   #7
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Wouldn’t you want to look at getting the Mickey’s in 315’s if you’re into 35’s? Unless they’re not available. Would think the 80 psi Toyo’s.....
Not trying to turn this into a recommendation thread, but just to throw it out there-
You might want to consider a tire better suited to driving in adverse conditions including snow/ice. I’ve run the Toyo M/T’s on the rig before, super tough but a harsh as hell ride quality, loud and they sucked in the snow. I’m running Goodyear Duratrac in 315’s E, have an extra sidewall layer from the smaller sizes, so no sidewall puncture issues. Wearing well, hybrid tread, and great in the snow.
Another tire that’s been gaining popularity is the Nitto Ridge Grappler, limited sizes, but comes in your 35X12.50R18LT F!!!
80 psi 3970 max load



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Old 12-25-2017, 12:14 PM   #8
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18”, hmmmmm. For airing down I would think smaller diameter like 16 or 17 would be preferred? Why 18”??
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Old 12-25-2017, 04:41 PM   #9
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Quote:
Originally Posted by REF View Post
Wouldn’t you want to look at getting the Mickey’s in 315’s if you’re into 35’s? Unless they’re not available. Would think the 80 psi Toyo’s.....
Not trying to turn this into a recommendation thread, but just to throw it out there-
You might want to consider a tire better suited to driving in adverse conditions including snow/ice. I’ve run the Toyo M/T’s on the rig before, super tough but a harsh as hell ride quality, loud and they sucked in the snow. I’m running Goodyear Duratrac in 315’s E, have an extra sidewall layer from the smaller sizes, so no sidewall puncture issues. Wearing well, hybrid tread, and great in the snow.
Another tire that’s been gaining popularity is the Nitto Ridge Grappler, limited sizes, but comes in your 35X12.50R18LT F!!!
80 psi 3970 max load



'03 Ford E350 7.3L Diesel
SMB RB50 w/CCV top
Quigley 4X4 w/Deavers & Agile RIP kit
I currently have 33" Baja MTZ's and really like them. The 305's are the closest E-rated 35" tires Mickey Thompson offer for an 18" rim. I think Goodyear Duratrac's are great tires for winter but not so much for hot summers. I have several friends that have run them and they just burn off too quickly during the high summer temperatures here in Kelowna.
Cheers
Darryl
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Old 12-25-2017, 04:44 PM   #10
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Originally Posted by 1der View Post
18”, hmmmmm. For airing down I would think smaller diameter like 16 or 17 would be preferred? Why 18”??
I prefer the look of 18" wheels but I'm not opposed to 17". As for airing down, I have never found myself in a situation where I needed to. That said at least having the option would be beneficial. More to consider.
Cheers
Darryl
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