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Living With 47's Part One

Daily Driving On Pit Bull Growlers

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Alot of times we're guilty of being go-fast guys, but we definitely fall victim to the woos of giant trucks. There is something about a huge tire on an off-road truck that attracts most gearheads like children to a monster truck show.

None of the staff has ever had any tire over 41 inches tall before, but if we were going to try driving on some monster tires, we weren't about to settle on any puny 44-inch donuts. At the same time, we didn't want to get so ridiculous that we couldn't fit legally on roadways. We decided that a nice, "conservative" size of 47 inches would be perfect to start driving on all the time. Since Pit Bull Tires qualifies their Growler model as "all-terrain like," we figured that tire was the best way to go. And though it did have a tread design that looked like it could roll smoothly down the highway, it was still a 47-inch-tall, bias-ply, off-road tire with tread voids big enough to get a tennis ball stuck in.

Our goal was to really live with this tire-driving it not only off-road, but around the city, to work, and on the Southern California freeways, as well. Since 47-inch Growlers are street legal, and there are people out there wanting to drive on them, we felt it was our responsibility to get the real deal on driving monster tires.

The Growler tread surface is quoted to be an "all-terrain like" tread. It seemed almost impossible to even imply that with a 47x21-20 off-road tire, but after driving on them on the freeway, we're confident in telling you that they are quieter than some radial mud terrains we've driven on. And we couldn't argue that they surely get traction on every type of terrain.
The Growler tread surface is quoted to be an "all-terrain like" tread. It seemed almost im

When you reach a tire of this size and proportion, it really doesn't matter what vehicle you are starting with; most modifications will be the same. You'll either need to do some major cutting or you'll have to lift your ride to the sky to fit mega tires like these. You'll also have to have nothing less than a 1-ton drivetrain. And perhaps most important to success, you must have some way to repel the onslaught of tire tickets that some law officials might want to write.

We decided we'd stick on the tires first, see what hits, clearance sheetmetal and lift the truck as necessary, and finally work on the drivetrain (hoping the orginal one would hold up until then).

Since we didn't we didn't really have any trucks that were even close to being able to accept 47-inch tires, we turned to Jeeps R Us to inquire about using their big white fullsize two-door Cherokee Chief. It was sitting on 38.5-inch tires, but had way too much clearance for that small of a tire. We stopped by the shop and asked if we could borrow their Jeep for a few months, occasionally bringing it back for some work to be done. Little did they know our plans....

Specs (as tested)
MAKE/MODEL: Pit Bull Growler
MOUNTED ON: Dick Cepek
DC-1 20x12s
SIZE ON SIDEWALL: 47x21.00-20
LOAD RANGE: D
TREAD DEPTH: 26/32
# PLIES IN SIDEWALL: 4-ply nylon
# OF PLIES IN TREAD: 4-ply nylon
WEIGHT OF TIRE: 150 pounds
(without wheel)
MEASURED DIAMETER UNLOADED: 47.20 inches
MEASURED WIDTH UNLOADED: 21.0
MEASURED TREAD WIDTH: 16.50
AVAILABLE SIZES: 31-47 inches
AVAILABLE FOR: 15- to 20-inch
wheels

  • Since this Pit Bull Growler was 21 inches wide, it would be crazy to stick it on anything skinnier than a 12-inch-wide wheel. As we found out, there are almost no companies offering a 12-inch-or-wider, 20-inch-diameter wheel. Luckily, Dick Cepek has the DC-1 in a 20x12-inch size, allowing us to put the giant tire on a high-quality wheel with some style.
    Since this Pit Bull Growler was 21 inches wide, it would be crazy to stick it on anything
  • If you're trying out a 47-inch tire and 20-inch wheel package like us, you might have some trouble finding a shop willing to even mount these suckers. Wheel and Tune, just down the street from Jeeps R Us In Laguna Beach, California, was able to get the Growlers on the DC-1s for us.
    If you're trying out a 47-inch tire and 20-inch wheel package like us, you might have some
  • We thought for sure that the big tires would rub on something when we cranked them, but we got miraculously lucky and they cleared even the leaf springs and fender corners at full turn. Amazing. The rear of this fullsize Jeep will definitely need to be modified, though; we'll need to do some cutting and space the rear wheels and tires out a little bit.
    We thought for sure that the big tires would rub on something when we cranked them, but we
  • Driving on the freeway was a trip. Some of the staff took turns driving it back and forth to work, around town, and out at night, to get a real feel for what it was like living on 47-inch tires. The bumpsteer and looseness in the steering was hugely accentuated with such a big bias ply tire, making it a little funky to drive. The axles were geared to 5.13, and the built 401ci V-8 had enough power to keep it at Southern California freeway speeds. There was more than enough power to take off from stoplights and step out in front of the rest of traffic around town, but the giant tires would wrap the rear suspension easily and the tires would rub the fenderwells. We'll solve that issue in the near future. No matter what, it was a ton of fun driving something that made tractor-trailers look sort of smaller.
    Driving on the freeway was a trip. Some of the staff took turns driving it back and forth
  • We only wanted to get a couple pictures in the dirt, taking care since we knew full-well that the 3/4-ton drivetrain was not adequate to hold up to these big Growlers. Like popcorn, the Dana 44 and 13-spline Dana 60 axles went "Snap! Snap, snap!" and we were stationary. Actually, we rolled backwards down the berm.
    We only wanted to get a couple pictures in the dirt, taking care since we knew full-well t
  • A short round of pictures quickly turned into a rescue mission. Thankfully, we had brought another truck that acted as an anchor and tug to get our big Jeep back to the street. We weren't planning on upgrading the drivetrain so soon, but it looks like this big Jeep isn't moving again until we find axles that will hold up to these monsters.
    A short round of pictures quickly turned into a rescue mission. Thankfully, we had brought
  • Funny how I just wrote about AAA coming to my rescue with the Super Duty in the January 2010 Rant.... Once again, there AAA was, pulling something back home for me. A good tow service can be invaluable if you like to drive your junk to the trails like we do. Check in next month to see how we make sure these tires fit at full stuff in all conditions, while we're busy building some axles and steering that will hold up to these monster meats.
    Funny how I just wrote about AAA coming to my rescue with the Super Duty in the January 20
Sources
Dick Cepek Tires & Wheels
4600 Prosper Drive
Stow
OH  44224
330-928-9092
www.dickcepek.com
Wheel And Tune
1945 Laguna Canyon RD
Laguna Beach
CA  92651
949-497-1650
Pit Bull Tires
1815 Locust Street
St. Louis
MO  63103
800-645-2006
www.pitbulltires.com
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