All Terrain Package & 20" Wheels

[maxco]

Has anyone noticed that GMC now offers the "All Terrain" Package with 20" wheels? It's called the Sierra Off Road Package. I am pretty sure

 

I remember seeing something somewhere that GM recommends not driving off road with your 20" wheels...

Seems kinda strange to me.

[191185]

where does it say not to take it off road in the manual ? that is very strange.. however I needed to take my old 2002 tahoe off road a few times on 23's .. and it worked on gravel but not much else .

 

I believe the problem is with the lower profile tires .. park your 20" wheels on top of a big sharp rock, and look how much your tire "folded" in on the rim .. . on 18's you have more play .. 2 inches more to be exact ..

[hy_69]

actually you have 1 more inch of tire to "fold" cause 20inch is the diameter! so if you have 18inch diameter... it gives you 1 more inch on each side and when driving only one side is actually making contact with the road.. and yes i'm pretty sure its because of the tires... low profile tires arent for off-roading.. bigger tires means more shock absorbing from the tire.. meaning less stress on the rims and on the truck... and low profiles tires are stiffer.. driving off the road you need softer tires at lower psi with more interior volume to adapt to the terrain for better handling so the tire wont slide... thats the reason why <18inch are recommended for off-roading but 20's arents.. unless you're running 20" wheels with 37" tires.. there i dont see a problem! anyway i'm not a specialist or anything.. just my point of view

[dave_benn]

where does it say not to take it off road in the manual ? that is very strange.. however I needed to take my old 2002 tahoe off road a few times on 23's .. and it worked on gravel but not much else .

If you read in the manual (i have a '10 sierra) it says 20" rims are not for off road use. Which i would assume means the factory ones with the factory tires.

[atsbob]

If you read in the manual (i have a '10 sierra) it says 20" rims are not for off road use. Which i would assume means the factory ones with the factory tires.

 

 

Yes I have 20's and my manual says do NOT take off road

[MS3DALE]

Has anyone noticed that GMC now offers the "All Terrain" Package with 20" wheels? It's called the Sierra Off Road Package. I am pretty sure

 

I remember seeing something somewhere that GM recommends not driving off road with your 20" wheels...

Seems kinda strange to me.

 

Must only be up in Canada,Here in the states the All-Terrain pkg. comes only with P265/65R18 on/off-road tires.

[snarkee]

Sierra Offroad Package TBA

All Terrain Badging

On front fenders and carpeted floor mats.

Unique Instrument Cluster

Includes mechanical brush accents.

Rancho Brand White Shocks w/Red Letters

 

Unique Body Coloured Grill Insert & Surround

Body Coloured Front & Rear Bumpers

Body Coloured Body Side Mouldings

I

ncludes chrome top insert.

Rear Parking Assist

Off Road Suspension Package

Includes rear monotube shock absorbers, off-road jounce bumpers, front stabilizer bar and Z71 decal.

High Capacity Air Cleaner

Off-Road Skid Plates

Includes shields for engine, transmission, front differential and transfer case.

20" Chrome Clad Aluminum (4)

(508 mm x 216 mm). Spare is a steel wheel.

Tires: P275/55R-20 BW AT

Includes 432 mm (17") blackwall all seasons spare.

Electronic Air Conditioning

Fog Lamps

OSRV Mirror LH/RH Heated Power Adjusting & Folding

Self-Dimming Inside Rearview Mirror

This option features:

Brand name front shock absorbers

Brand name rear shocks

Skid plate(s)

Power remote driver side door mirror w/tilt down

Body-coloured driver door mirror

Power folding driver side door mirror

Auto-dimming driver side mirror

Turn signal indicator in driver door mirror

Power remote passenger side door mirror w/tilt down

Body-coloured passenger door mirror

Power folding passenger side door mirror

Turn signal indicator in passenger door mirror

Body-coloured front bumper

Body-colour rear bumper

Body-coloured rear bumper rub strip or fascia accent

Chrome bodyside insert

Body-coloured grille

Badging

Front fog/driving lights

All-terrain tires

Auto-dimming rear view mirror

Metal-look instrument panel insert

Metal-look door panel insert

Metal-look console insert

Automatic air conditioning

Dual zone front HVAC controls

Rear parking sensors

 

 

very interesting....AT 20 tires and body colour matched front and rear bumpers as well as the grill....this may be one sexy gmc

[MS3DALE]

Look what I found guys,Its not just for the Canadian's!! Its for us down here in the States as well,This was just added to the GM order guide yesterday so its new.....

 

NEW! Body Color All-Terrain Package, (RPO "X31") includes

(Z71) Off-Road Suspension Package

(Z82) Trailering Package

(B58) front and rear carpeted floor mats

(DD8) inside rearview auto-dimming mirror

(S84) 20" x 8.5" (50.8 cm x 21.6 cm) chrome-clad aluminum wheels

(RHG) P255/55R20 all-terrain blackwall tires

(DL3) outside heated power-adjustable,power-folding body-colored mirrors

(T96) fog lamps

Rancho brand shocks that are White with Red letters

body-colored door handles and mirror caps

color-keyed front and rear painted bumpers

side moldings with chrome accent

unique four bar horizontal grille insert and surround

"ALL TERRAIN" badging on the front fenders

carpeted floor mats with embroidered "All Terrain" logo

unique sill plates

unique instrument cluster with Z71 logo

"mechanical brushed aluminum" accents for instrument panel, center console and switch trim plates

 

*Requires exterior color (41U) Onyx Black, (46U)

Stealth Gray Metallic or (50U) Summit White. Available to order on

Crew Cabs with (PDP) SLE White Diamond Edition*

[jarettg]

i have an 09 all terrain and mine has 18" rims with 265/65R18 rock chucking duelers!

[sab316]

Hmmm interesting... I want to know what they look like.... Wonder if its just a 20" version of whats on it now...

 

That being said... its saying don't take the 20" rims off road if you're doing some hard core off roading. Now for the average person, we aren't taking our new trucks on a rock climbing trail. We're going down the muddy field road, or possibly through a few holes... Nothing major. So 20" rims aren't that big of a deal. That extra sidewall does give you a nice little cushion and keeps your rims from getting scratched up as well.

 

I'm currently on the fence about switching to GMC 20's or sticking with my 17's. I like the extra sidewall because I do a fair amount of off road / rough driving. But GMC 20's look so purty!