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What's different about the R270?
The R270 looks like many other rib radials
- straight grooves, deep sipes, irregular wear-fighting features.
The big difference is the R270 has a whopping 22/32nds of original
tread depth.
Why the extra depth?
For quite a while, some fleets have been
using rib radials on all axle positions. This tire was made for
them.
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| R270 radials
offer 15-22% deeper tread than comparable rib radials.
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Why were they doing that?
Imagine how simple life would be if you could
use just one pattern and size on every axle position. You'd buy
just one tire. You could have a much smaller tire room, and there
would be far less confusion about orders and emergency road service.
What were these fleets using?
Most of them were putting 18/32" rib radials
on all positions. These tires worked OK, but on drives, they left
a little to be desired.
In what way?
They were quite shallow by comparison to
standard drive axle radials, so they tended to wear out more quickly.
That's why Bridgestone engineers created the R270, at 22/32" tread
depth. With an extra 4/32" of usable tread, the R270 is a real answer
for simplifying tire inventories without sacrificing competitive
tire life.
But rib radials on drives? Can that
work?
Some of the most satisfied R270 users are
in the North, and several are in the Pacific Northwest.
How can they get traction without a
traction pattern?
They've found the start-up traction of the
R270 is remarkable. On hard surfaces, even wet or icy ones, what
you really need is maximum tread contact. That's what the R270 tread
design provides.
The R270 tread is also wider than many conventional rib radials,
and, hundreds of deep sipes bite through water and road films.
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| Photographed from below as it crosses
a water-flooded glass plate at 30 mph, the R270 tread
pattern effectively drives water out of the footprint
for outstanding wet traction. |
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But what about snow?
As one driver told us, "Unless you're the
first person to drive on fresh snow, chances are, you're driving
on a hard-packed surface anyway."
And drivers believe that?
The R270 has made a believer out of many
a driver. Another said that with a full load on glare ice - by deliberately
locking the trailer brakes - he was able to stall his engine, but
couldn't get the R270s on his drives to spin. That's how much grip
the R270 tread design provides.
And, the R270 is designed for smooth steering, together with low
noise and vibration. At one fleet, drivers running on R270s said
their trucks rode and handled like automobiles.
How well does the R270 wear?
The R270's extra 4/32" provides lots of extra
tread life on drive axles, and it doesn't hurt on steers either.
And, Defense GrooveT and Equalizer RibT designs help distribute
forces evenly over the tread surface to combat initiation and spread
of irregular wear.
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| In this computer display of an
R270 under normal load, colors indicate a very uniform
distribution of pressure throughout the footprint - the
key to outstanding traction and long, even wear. |
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Maintenance must be easy.
With just one size and pattern, replacements, rotations and retreading
become much simpler.
Steers can be rotated to drive positions, and tires that have been
running on drive positions for a while tend to produce incredibly
even wear when placed on steer axles.
Why is that?
The high torque and stable geometry of drive
axles may initiate a very even wear pattern. And once a wear pattern
is set, it tends to remain constant throughout the life of the tire.
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| With R270 radials, you can rotate
steer tires to drive positions and vice versa, in addition
to conventional rotation patterns. |
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Can the R270 be used on trailers?
It certainly can. Some fleets are "running
out" those last few 32nds in trailer positions before retreading.
So, you can say the R270 is a great steer tire and a great drive
tire - that can become a great trailer tire.
Is the R270 fuel-efficient?
Yes it is. Rib designs are inherently more
fuel-efficient than deep tread block or lug patterns, so the R270
provides significant fuel economy advantages.
| Ask your dealer or Bridgestone
representative for a copy of this new R270 brochure. |
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Should we try them?
If you run long hauls, and if you'd like
to simplify your tire ordering and inventories, and if your drivers
are open-minded enough to try something new, we think you'll be
pleased with the R270, the first radial specifically designed for
use on every axle position.
R270 radials are available in 295/75R22.5
and 285/75R24.5 sizes with a "G" load rating.
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