The Nitty Gritty: |
Advantages of Upgrade: |
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Improved Approach,
departure and break-over angles |
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Better traction |
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Ability to air down slightly for even better traction and sand flotation |
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Disadvantages of Upgrade: |
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Loss of torque |
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More rotating mass (longer braking distances, more axle stress) |
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Technical Specifications: |
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Tech 1 black steel Rock Crawlers - 15"x8" with 4.5" backspacing and 5 on 4.5" bolt pattern |
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Goodyear Wrangler MT/R, 33"x12.5" |
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Tools Needed: |
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Lug nut socket and wrench |
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Floor jack |
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Materials Used: |
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Ummm... Air? |
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Final Cost: |
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Wheels (5): $220 |
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Tires (5): $920 |
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Tire mounting and balance: $50 |
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Shipping (wheels): Included with lift |
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Shipping (tires): None - purchased locally |
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Total: $1,190 |
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Project Overview:
Bigger tires allow for improved traction, more ground clearance, and greater
approach, departure and break-over
angles. All of these factors contribute greatly to the overall trail
capability of an off road vehicle.
Product Selection:
The wheels were easy. I wanted black steel wheels. I didn't want the ugly
blue or red strip around the rim, though. That narrowed it down to Tech 1
Rock Crawlers. I picked up 5 of them from
Rusty's
Offroad when I picked up my
lift. I got 15"x8" rims because they're the easiest to match to
33" tires. As it turns out, these wheels had the red and blue stripe on
them anyway. Oh well.
Tires were a much more difficult choice. I really liked the look of the
Mickey Thompson Baja Claws. They just look killer. But I read around and
didn't hear very good things about them. They don't wear well - which is
important when you spend $200 per tire. They're not actually as tall as they
are rated - a 33" is actually about 31.5". And, they don't have the
best traction in all weather conditions. Since this is also my daily driver,
I needed something that would give me excellent wear and all-season traction.
So, after a little more research, I finally decided on some Goodyear
Wrangler MT/R 33"x12.5"s. I read nothing but great reviews about
them. Traction, tread wear, off road performance were all highly praised.
And, they still look cool. *grin*
Other Notes:
Because of the loss
of torque from installing bigger tires, I also had to install
taller gears. I
would have liked to put in
lockers at the same time,
but they were cost prohibitive with all the other
projects I was doing at
the same time. I'll definitely put some lockers in later, though.
Final note: If you're planning on lifting your Jeep and putting big
tires on for the first time, plan on dancing a little jig when you pick up
your new tires. It's funny how something as silly as buying tires can be
so much fun!
Installation:
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Be for I put on
my lift and new
wheels and tires, I wanted to get a frame of reference for just how
much higher I was before and after the upgrade. So, I started by
measuring the fender height, front and rear.
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Then I measured the height to the
axle on all four tires. Average height was 13.25". As far as
the wheels and tires are concerned, this is the more important
measurement. This is the only place you'll see gain purely from
bigger tires. Increased frame height comes from a combination of
bigger tires and suspension lift.
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Holy cow! That's a big
difference! These 33" tires dwarf the stock rubber. While I
had the new tires next to the Jeep, I took the opportunity to set
them in the wheel wells. I was hoping to hold of on cutting off
my stock fenders and putting on new flares until later. But it was
obvious that I was going to have to do it now or I'd have some
serious tire rub issues. So I ordered up some
Bushwacker
cutouts.
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Not only are the new tires taller,
but they're much wider as well. More traction!
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The shadows in this picture don't help
much, but you can still clearly see the difference in the tread
between the Goodyear Wrangler MT/R and the "stock" tire.
The lugs on the MT/R make the stock rubber look like it's bald.
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Here's how the old and new tires
"stack up." (Pardon the pun.) The new tires are 33% wider.
(It takes 4 stockers to stack up to 3 of the 12.5" wide new
tires.)
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With my lift kit finally installed, I was
able to put on the new tires. What a difference!
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