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Thread: Tire Size - 35x10.5 R17 Load Range D?

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    nitsuj08's Avatar

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    Tire Size - 35x10.5 R17 Load Range D?

    First off, is it recommended to tow with and D-rated tire?

    Maybe 10-12k pounds, sometimes more.

    I have a 28’ camper, 8k dry and around 10-11k wet/loaded.

    I’d also sometimes carry alfalfa bales on a 20’goose neck.

    Since many people regear with 35x12.5 tires, will 35x10.5 require regearing?

    Kenda Klever RT 35x10.5R17 would be 3197@65psi.

    2008 3/4ton Long Bed
    68RFE - ATS Separator/Accumulator plate
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    Catchcan - CCV delete
    H&S MM,Banks gauges-EGT,PSI
    285/70R17 Vision-tactical

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    Tire Size - 35x10.5 R17 Load Range D?

    I would look at the weight rating in lbs rather than D vs. E and compare it to your maximum axle weight.

    For example, your truck has a max axle weight of 7k lbs, and if you think you might get close to that, then you'd want at least 3500 kg rated tires.

    I like to have a bit of a margin of safety as well.

    That said, generally, Ds are better suited to lighter vehicles.

    As for gearing that is driven by tire diameter, width doesn't impact it.

    Good luck!


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    nitsuj08's Avatar

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    Tire Size - 35x10.5 R17 Load Range D?

    Quote Originally Posted by BikePilot View Post
    I would look at the weight rating in lbs rather than D vs. E and compare it to your maximum axle weight.

    For example, your truck has a max axle weight of 7k lbs, and if you think you might get close to that, then you'd want at least 3500 kg rated tires.

    I like to have a bit of a margin of safety as well.

    That said, generally, Ds are better suited to lighter vehicles.

    As for gearing that is driven by tire diameter, width doesn't impact it.

    Good luck!
    Thanks for the reply.

    I’d rather have the extra safety and peace of mind, but I got time to research a little more.

    Regearing is more so for the final tire-to-road ratio because of the diameter per se, not weight.

    Do I have that right? I always thought it was due to tire weight.

    2008 3/4ton Long Bed
    68RFE - ATS Separator/Accumulator plate
    Deleted
    VGT Switch
    Catchcan - CCV delete
    H&S MM,Banks gauges-EGT,PSI
    285/70R17 Vision-tactical

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    No Vacancy Power247's Avatar

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    Tire Size - 35x10.5 R17 Load Range D?

    Quote Originally Posted by nitsuj08 View Post
    Thanks for the reply.

    I’d rather have the extra safety and peace of mind, but I got time to research a little more.

    Regearing is more so for the final tire-to-road ratio because of the diameter per se, not weight.

    Do I have that right? I always thought it was due to tire weight.
    Correct, the need to regear is based on changing the tire's overall circumference; diameter is just an easier reference point.

    That said, I ran Nitto Terra Grappler's 305/70/17's (34"x12") on my '12 for years.

    They were a Load Range D tire and never had an issue, even when pulling our 35' travel trailer.

    The key, as said above, is confirming the tire's max load rating meets or exceeds your use.

    Sent from my SM-T860 using Tapatalk

    Greg
    2019 | RAM 2500 | CCSB | 6.4 HEMI

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    Tire Size - 35x10.5 R17 Load Range D?

    Quote Originally Posted by nitsuj08 View Post
    Thanks for the reply.

    I’d rather have the extra safety and peace of mind, but I got time to research a little more.

    Regearing is more so for the final tire-to-road ratio because of the diameter per se, not weight.

    Do I have that right? I always thought it was due to tire weight.
    Yes, that's right, it's about the final engine-to-vehicle speed ratio.

    The weight matters a little bit, but when talking about tires of this size on trucks with the weight and torque of the Cummins, the weight difference of various 35" tires isn't really going to matter.

    Really heavy tires like 40"+ muds would benefit from lower gears than needed to maintain the factory gear ratio to help with the weight.

    Re-gearing also helps take some of the added stress off the transmission.

    A 68 transmission generally isn't very happy with big tires and stock gears.

    3.73 or 4.10 gears should be good for typical uses with 35s.

    With 37s, you'd want 4.10-4.46.

    For what it's worth, I have 37s on order, and when they come in, I'll have my stock 3.42s swapped for 4.10s.

    That said, 35s aren't much bigger than stock tires, and many people run them with stock gears.


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    Tire Size - 35x10.5 R17 Load Range D?

    I like this tool for comparing the results of various tire sizes and gear combos.

    Look up the rotations per mile for the tires you are interested in, as the actual size can vary quite a lot vs. the stated size.

    http://www.grimmjeeper.com/gears.html


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    Muzzy's Avatar

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    Re: Tire Size - 35x10.5 R17 Load Range D?

    The D or E rating is more related to the pressure at which the tire is rated for maximum load.

    The load index indicates the actual load in pounds a tire can handle.

    For our trucks, a load index of at least 121 is required.

    I run a D2 with a load index of 121.

    A 121 can carry 3197 pounds/tire.

    The D2 has a max pressure of 50 PSI so it can handle 3197/lbs per tire at 50PSI.

    I prefer the D2 over E because off-road traction is better with lower pressure and tends to ride a bit softer.

    You do sacrifice mileage.

    Here is a good reference from the Discount Tire site: https://www.discounttire.com/learn/l...nge-load-index

    -Muzzy

    2008 Megacab 4x4 G56 Trans - All mods lost in boating accident - EFI Live by Muzzy, 2nd gen S467.7/83/1.0, Banks Monster Ram, 5" Exhaust, Grid Heater Delete, Rail Plug, BD Flowmax LP, SB Clutch, Fuel Sump -8AN line, Bilstein 5100s, Cali Track Bar, Dynatec B-joints, Level Springs, 1" Lift Shackles Rear, Royal Purple Lubricants...there is probably more that I forgot.

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    nitsuj08's Avatar

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    Re: Tire Size - 35x10.5 R17 Load Range D?

    Quote Originally Posted by Muzzy View Post
    The D or E rating is more related to the pressure at which the tire is rated for maximum load.

    The load index indicates the actual load in pounds a tire can handle.

    For our trucks, a load index of at least 121 is required.

    I run a D2 with a load index of 121.

    A 121 can carry 3197 pounds/tire.

    The D2 has a max pressure of 50 PSI so it can handle 3197/lbs per tire at 50PSI.

    I prefer the D2 over E because off-road traction is better with lower pressure and tends to ride a bit softer.

    You do sacrifice mileage.

    Here is a good reference from the Discount Tire site: https://www.discounttire.com/learn/l...nge-load-index

    -Muzzy
    Hey all, thanks for the info.

    To put my situation more into perspective, here are the tires I am considering.

    They are 121 rated and 3197@65psi https://simpletire.com/paid?brand=ke...&delivery=Del3

    I also wouldn’t mind the 305/70r17 because they aren’t much bigger than my 285s.

    @Power247 How was the strain on your transmission?

    I see you’ve got the Hemi currently.

    I also believe I have 3.55 gears currently, and with my setup, mileage is decent, and overall satisfied.

    I would like not to stress out the transmission too much.

    That’s the overall goal.

    2008 3/4ton Long Bed
    68RFE - ATS Separator/Accumulator plate
    Deleted
    VGT Switch
    Catchcan - CCV delete
    H&S MM,Banks gauges-EGT,PSI
    285/70R17 Vision-tactical

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  17. Top Of Page | #9
    No Vacancy Power247's Avatar

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    Re: Tire Size - 35x10.5 R17 Load Range D?

    Quote Originally Posted by nitsuj08 View Post
    Hey all, thanks for the info.

    To put my situation more into perspective, here are the tires I am considering.

    They are 121 rated and 3197@65psi https://simpletire.com/paid?brand=ke...&delivery=Del3

    I also wouldn’t mind the 305/70r17 because they aren’t much bigger than my 285s.

    @Power247 How was the strain on your transmission?

    I see you’ve got the Hemi currently.

    I also believe I have 3.55 gears currently, and with my setup, mileage is decent, and overall satisfied.

    I would like not to stress out the transmission too much.

    That’s the overall goal.
    My 2012 was the High Output 6.7 with 3.73 gears.

    Overall I felt the larger size tires were actually easier on the truck.

    It kept the RPMs in the sweet spot (1800-2000) when cruising at highway speed.

    Remember thatDRD also tuned my truckD during this whole time, and I know his trans tuning helped alot too.

    Sent from my SM-G781U using Tapatalk

    Greg
    2019 | RAM 2500 | CCSB | 6.4 HEMI

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