Tires for Duramax/Allison c3500 crew cab DRW

**Travis Baker** · 03-24-2002, 13:14

I am interested to know what type of tires are on the Duramax/Allison Crew Cabs that are getting decent fuel mileage. I have Goodyear Wrangler SR 215 85 R16's and my mileage seems a little low. I also went to the Goodyear web site and these tires are not reccommended for this truck? Any help would be greatly appreciated.

**Pizza Man** · 03-24-2002, 14:01

Travis....I currently have the same tires as you and have 29k miles on them.....
What do you mean 'they are not recommended for this truck'?
How many miles you got on them so far?

**Travis Baker** · 03-24-2002, 14:22

Well I went to Goodyear.com and they have a little deal there where you can put in the year of your truck and the make and then it take you to another page where you put in the model. I did all of that and it brought up a list of the tires that they suggest for the vehicle. The Wrangler SR was not on the list.
Hope this helps, by the way I am getting a little less than 16 on the highway, what kind of mileage are you getting?

**Travis Baker** · 03-24-2002, 14:27

Forgot to give my mileage, it's 34000 and the tires have not held up well at all. How about yours?

**Pizza Man** · 03-24-2002, 15:30

Travis, Thanks for the replies....Not alot of 3500's users in this forum...anyways. I think Goodyear makes the sr especially for Gm....I get 16.6 highway empty...and 13.3 loaded(12k) trailer.
I rotated the tires every 4500miles. The tires look great....check out my picture trail and I think you can see a good piucture of the tread that is left. The tires suck in the mud and the snow... But smooth on the highway...

ksss · 03-25-2002, 01:45

I've got 235's on a K3500 D/A. The best I've ever got unloaded is 17.8 there should be about a 5% correction for the speedo on top of that but still not great. The tires are Kelly MSR's they are fairly aggressive, just a little less aggressive than a mud tire. My guess is that your best mileage will come from a size similiar to the stock tire. Typically the narrow tire will have less resistance thus better mileage, changes in final ratio relative to tire size not with standing.

**Mike G** · 03-28-2002, 05:45

Travis,
On my 2wd 3500, I swapped out the factory 215's for Bridgestone R273 SWP II's, LT235/85R16. Fuel mileage last summer was almost always about 19mpg. Right now I'm getting about 17.5mpg. 70/30 Highway/City. Only about a
1/4" of clearance between the duals on the stock rims.

Waiting for Alcoa's.
According to the calculator at http://www.4lo.com/
my speedo is now off by 4%. 70mph on the speedo=73mph actual, 100 miles on the Odo=104 miles actual.

mdrag · 03-28-2002, 10:32

MikeG,

IIRC, the new Alcoa Hotshots are going to have a slightly different offset for the new style trucks - but Alcoa indicated the same tire size (215) would be used - that is no increased clearance for wider tires. I'll have to check and see if I can find that email...

[ 03-28-2002: Message edited by: mdrag ]</p>

mdrag · 03-28-2002, 10:38

Mike G,

Found it http://forum.62-65-dieselpage.com/cg...=7&t=002477&p= :

quote:
--------------------------------------------------------------------------------
"The New redesigned Chevy 2001-2002 Alcoa HotShot Wheel
The new Chevy dual wheel has finished the design process and is getting tooled up for production. The wheel is still a month or two away, but will be worth the wait. The wheel has a larger center hole than the earlier models. Also, they have widened the wheel from 16x6 to 16x6.5, but they have move the offset in so you will still have to run a LT21575R16 tire."

This was taken from an email I received from Southwest Wheel www.southwestwheel.com .

**SGJ** · 03-31-2002, 13:41

Ksss ,
Did you install spacers on your 235's , if so where did you get them and how expensive were they . If not do your tires touch when the truck is loaded .

**Mike G** · 03-31-2002, 17:46

-------------------------------------------------
"The New redesigned Chevy 2001-2002 Alcoa HotShot Wheel
The new Chevy dual wheel has finished the design process and is getting tooled up for production. The wheel is still a month or two away, but will be worth the wait. The wheel has a larger center hole than the earlier models. Also, they have widened the wheel from 16x6 to 16x6.5, but they have move the offset in so you will still have to run a LT21575R16 tire."
-------------------------------------------------
Oh boy, that's disappointing news. I wonder how thick the new wheels will be at the bolt on point. I remember a very good post sometime back by a guy called "JP." He did extensive research regarding wheel thickness, stud length, etc. Hopefully, there is enough stud there to allow us to use Alcoa Hot Shots on the outside and the stock rims on the inside, and maybe a spacer to allow for the 235/85's. I'm at the point of no return with the tires, I've already spent the big bucks to get rid of those dinky 215's and don't care to go back to them. Maybe someone will get the new Alcoa's and have 235/85's installed at that same time and post the results for the rest of us? Anyway, thanks mdrag for the info. Appreciate it.
Mike

ksss · 04-02-2002, 00:16

SGJ,
I USED SPACERS. THEY WERE ABOUT $12.00 PER AND I GOT THEM AT THE TIRE STORE. IF YOU CAN'T FIND THEM LOCALLY I BOUGHT MINE AT RONS TIRE IN RIGBY IDAHO (208-745-TIRE).

**IndigoDually** · 04-04-2002, 06:39

ksss, How wide are the spacers that you are using? Any problems: rubbing, how heavy do you pull, pin weight, etc. ?

Thread: Tires for Duramax/Allison c3500 crew cab DRW

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