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Old 12-14-2016, 09:57 AM   #1
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SWD Pickup truck (TV) with G-Rated tires?

We had some good in-depth conversation about our new upgrade to an XLR 422AMP and our newly placed order for a 3500HD Dually (8ft box) and how the turn radius will not be as good as going with a 3500HD SRW utilizing the 6.5' box.

I told him that I wanted the shorter box but GM forces you to get the 8ft box when you order DRW. He quickly mentions "what about the SRW truck, upgrading the ply on the tires!?" I quickly respond that they are 18" E rated ones (precisely: LT265/*70R18E).

Anyone with experience going from E's to G's on their SRW TVs? My order just went in, and I'm sure I could change it to a 6.5' box SWD. I'd really like the slightly better turn radius of the short box WB.

Info; The 422AMP's pin weight is 3643#, and I have hauled 2 ton (4K) in my current 2500HD/Duramax many of times, no issues but I know a dually would have less sway however. The new truck is going to be a 3500HD either way, DRW (or possibly now) a SRW with heavier ply tires.

I guess it comes down to; Less Sway -or- Tighter turn radius, but if I could up the ply of the tires to maybe G rated?. SWD could be back in play.
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Old 12-14-2016, 10:05 AM   #2
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G rated tires will NOT increase the capacity of the truck.

I'd get the dually and deal with the slightly bigger turn.
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Old 12-14-2016, 10:13 AM   #3
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Originally Posted by Top_Speed1 View Post
I told him that I wanted the shorter box but GM forces you to get the 8ft box when you order DRW. He quickly mentions "what about the SRW truck, upgrading the ply on the tires!?" I quickly respond that they are 18" E rated ones (precisely: LT265/*70R18E).

Anyone with experience going from E's to G's on their SRW TVs?
I am curious as to this. You had an option of a Load Range G tire in a LT265/70R18 tire?

Being in the tire biz, I am not saying they don't make it, but I have never seen it yet..... and am real interested in who manufactures it.
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Old 12-14-2016, 10:14 AM   #4
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G rated tires will NOT increase the capacity of the truck.

I'd get the dually and deal with the slightly bigger turn.
The 3500HD capacity is fine, I'm just trying to get less sway/heat and overall better performance and safety under load.

One side of me is saying the same thing "just get the DRW and be done with it!"
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Old 12-14-2016, 10:22 AM   #5
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I am curious as to this. You had an option of a Load Range G tire in a LT265/70R18 tire?

Being in the tire biz, I am not saying they don't make it, but I have never seen it yet..... and am real interested in who manufactures it.
Not from GM as an ordered option, it would be salesman added, and good question as maybe this is all a pipe dream also.

I'm kinda the monkey in the middle on all of this, hence why I'm asking here.
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Old 12-14-2016, 10:27 AM   #6
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Not from GM as an ordered option, it would be salesman added, and good question as maybe this is all a pipe dream also.

I'm kinda the monkey in the middle on all of this, hence why I'm asking here.
Aaaah, OK. I just checked every one of my suppliers for this "G" rated tire in that particular size, with no luck. Load Range "E" was the highest one they carried.

The tire stuff changes so fast, that I've learned to never paint myself in a corner with absolutes. Just because I haven't seen it, doesn't mean it's not out there, especially if a certain OE vehicle manufacturer had it special made for a particular vehicle/line.

However, since you stated a salesman is saying this, and it's not an option from the manufacturer, I'm going to step back in my search...as there is room for doubt now.

Thanks for letting me know.
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Old 12-14-2016, 10:38 AM   #7
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The 3500HD capacity is fine, I'm just trying to get less sway/heat and overall better performance and safety under load.

One side of me is saying the same thing "just get the DRW and be done with it!"
Get the dually....

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Old 12-14-2016, 11:24 AM   #8
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^Now that is funny!^
Don't think I could convince the wifey on that one however


So my wheels got turning again (no pun intended) when I saw this post by a member here; "jmycka". He's pulling a XLR 415AMP, which is very close to the size of the 422AMP.

Not sure if his Ford is a F250 or F350 however. He has been asked (on that thread) how it pulls the 415AMP, but no response by him.

So I'm really liking his short box SRW setup....
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Old 12-14-2016, 01:22 PM   #9
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Tires

I would want the G rated tires on my fifth wheel not my truck
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Old 12-14-2016, 01:41 PM   #10
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Ford F350 2017, Dually is only available in a 8' box as well.. I agree, I would prefer the 6.5 box if it was available
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Old 12-14-2016, 02:01 PM   #11
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Get the dually....

Ford Idaho-- Thay would probably only work in Owyhee County!
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Old 12-14-2016, 02:05 PM   #12
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I have read about many people changing their wheel AND tire setups to 19.5" in order to run the heavier rated tires. Most often this is done by people with larger pickup bed campers and they buy Rickson wheels and G rated tires. Consensus seems to be:
1)Expensive. Like $4-5K when all said and done.
2)G rated tires are much harder/heavier and tend to follow ruts more than an LT E rated tire
3)Tougher and less flat prone/longer lasting
4)Most who are hauling over their payload ratings seem to be happy with the setup.
I suggest doing some reading on a truck camper specific forum to get more info.
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Old 12-14-2016, 09:53 PM   #13
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I have a gmc 2500 duramax and am picking up Michelin defender ltx in a 285/65/r20 that will have a load rating of 3,800lb per tire which incress the load by about 5-600 lb from factory. this is still an e rated tire at 80lb air presser.
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Old 12-15-2016, 01:33 PM   #14
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I would want the G rated tires on my fifth wheel not my truck
The G-Rated tire <option> is already on the 422AMP 5er.

I called my local Goodyear tire (buddy) here in town, apparently I'm not the only idiot wanting G Rated tires for the LT range.

He said he hasn't seen them available in LT265/*70R18, at least in Goodyear, only the E Rated ones ( just as OEM equipped).
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Old 12-16-2016, 08:07 AM   #15
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i went from a 2500HD 6.6ft box to a dually with the 8ft and honestly i dont think i notice much if any differance
plus i like and would rather have the extra room in the box
if your not worried about it fittng in a garage or anything
the stability of the Dually is worth it IMO
do you think with that 5ver on the back your going to notice it?
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Old 12-16-2016, 10:06 AM   #16
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Last nights dinner conversation was all about this topic.

We (okay, me!) have decided to keep the dually 3500 on order. It all comes down to safety basically.

Yes, I really want the tighter turning radius, she really wanted the slightly smaller, better looking and specifically better parking at sightseeing spots- truck.

So Dually (DRW) wins here, but it was one helluva debate!
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Old 12-17-2016, 08:53 AM   #17
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I have a gmc 2500 duramax and am picking up Michelin defender ltx in a 285/65/r20 that will have a load rating of 3,800lb per tire which incress the load by about 5-600 lb from factory. this is still an e rated tire at 80lb air presser.
Will you be able to use your stock wheels, and will your speedometer and odometer still read correctly?

I assume you have the same LT265/60/R20 tires that I have.
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Old 12-17-2016, 09:52 AM   #18
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kingfisher, I changed to a 285/60/r20 for the reason of the speedometer-computer changes. would have been a extra trip and cost at the dealership for a correction onthe computer. with the 285/60/20 size, no changes were needed and the wheels were also ok. the load rating was a little lower at 3450lb or there about and since the rear axle weight is around 7200lb I think I am very happy with the new tire ratings, old 265/60/R20 was about 3100 lb. much better grip on light snow with the Michelin we will see in deeper snow latter to day and tonight bad weather coming.
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Old 12-17-2016, 10:26 AM   #19
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I have a gmc 2500 duramax and am picking up Michelin defender ltx in a 285/65/r20 that will have a load rating of 3,800lb per tire which incress the load by about 5-600 lb from factory. this is still an e rated tire at 80lb air presser.
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kingfisher, I changed to a 285/60/r20 for the reason of the speedometer-computer changes. would have been a extra trip and cost at the dealership for a correction onthe computer. with the 285/60/20 size, no changes were needed and the wheels were also ok. the load rating was a little lower at 3450lb or there about and since the rear axle weight is around 7200lb I think I am very happy with the new tire ratings, old 265/60/R20 was about 3100 lb. much better grip on light snow with the Michelin we will see in deeper snow latter to day and tonight bad weather coming.
Tall Frog, being in the tire biz, I am kinda particular about tire sizes and making sure people do not kick numbers, as it changes everything as far as a tire size is concerned.

I may be able to help with a possible misunderstanding though, once we clarify exactly what tire size you had originally on your truck...and what tire size you ended up with on your truck.

I emboldened in blue the contradiction of two posts, the first which states a 285/65R20 and the second which states a 285/60R20. I am assuming you changed your mind on the 285/65 and went with the 285/60 as per a subsequent post. However, if the only thing that changed your mind was the need to reprogram your speedometer, you may have not taken that out of the equation with your second choice of tire.

The tire with the 65 series aspect ratio is taller than the tire with the 60 series aspect ratio, even with the 285 section width being the same.

If your stock tire (emboldened in red) was actually a 265/60R20...then even if you replaced it with a 285/60R20, that 285/60 is going to be wider (285) and taller (60% of 285) than the OE 265/60 (60% of 265).

Your speedometer will still be off somewhat.

Here are the specs for the Michelin defender 285 and 265---60R20 tires. You can see the difference in diameter which is nearly an inch.

The 285/60R20 is 33.4 inches in diameter and the 265/60R20 was 32.5 inches in diameter. You probably will still need to reprogram your electronics to accommodate this change if you want more accuracy...but it's probably at worse only a few miles per hour...and the difference is less the slower your speed.
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Old 12-17-2016, 09:59 PM   #20
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yes I did buy the 285/60/R20, this tire size did change my speedometer at 70 mph my rv gps was showing 1 and some times 2 mph higher which I don't see a problem with. the fix if it can be done by the dealership would cost about $80. to $ 100.00. the width of the factory rim is with in the spec. for the size of tire i bought. The width of the tire fits well in the fender well and I can see no clearance issue, the extra load rating was what I was looking for as we hope to upgrade to a fifth wheel in a year or two and the factory tires were not very good in wet or snow covered roads. they looked like still 6-7/32 of tread left after 42,000 miles with even wear across the tire.
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