SRAM Announces The Rail 40 Wheels

by Brian Mullin on May 5, 2015

SRAM
has been busy expanding their mountain bike wheel lineup with some
valuable input from Enduro World Champion Jerome Clementz of France. Their latest wheel release is the RAIL 40, which is a lightweight,
strong and stiff beast meant for the roughness of the racing circuit. The head mtb wheel engineer in SRAM’s Colorado Springs office Bastien Donzé and his entire team entirely developed, designed and tested the wheels locally. 

The wheels come in 27.5″ and 29″ sizes, weigh 1800 grams, retail for
around $700 and are full of excellent features. The tubeless wheels include 52 points of contact, double butted spokes with the same length on all wheels, 23mm wide rim profile and precision machined bearing races. 

Press Release

The Relentless Pursuit of Balance
RISE Higher. ROAM Farther. RAIL Harder.

You
don’t win by being the lightest. Or the stiffest. Or the toughest. You
win by being the fastest. And that takes a wheel designed specifically
for the modern mountain biker. At SRAM, we start with the demands of the
terrain and work forward from there—carefully balancing each wheel’s
design around five key attributes: weight, inertia, engagement,
stiffness and durability. No matter where you ride, SRAM wheels will
take you further. RISE higher. ROAM farther. RAIL harder.

RAIL Harder
Ready to attack, easy to maneuver. Built for aggressive All-Mountain
descents, RAIL wheels balance the strength and stiffness you need with
the lightness to climb quickly back to the top.

SRAM RAIL 40 Wheels

With WIDE ANGLE rim design providing superior stability, RAIL 40 can
withstand the most aggressive All-Mountain / Enduro riding by setting a
new benchmark for stiffness in its category. Featuring the perfect
balance of strength, lightweight and width for enduro terrain, RAIL 40
delivers high performance ride quality all the way down.

Aggressive Behavior

With
WIDE ANGLE rim design providing superior stability, RAIL 40 can
withstand the most aggressive All-Mountain / Enduro riding by setting a
new benchmark for stiffness in its category. Featuring the perfect
balance of strength, lightweight and width for enduro terrain, RAIL 40
delivers high performance ride quality all the way down.

Specifications

  • Available in 27.5” and 29”
  • Lightweight but strong aluminum rim, asymmetrical profile with TAPER CORE™ technology. Welded joint
  • UST Tubeless
  • WIDE ANGLE profile—23mm
  • SOLO SPOKE—double butted spokes
  • DOUBLE TIME ratchet mechanism for durable, quick engagement—SPEEDBALL bearings
  • Convertible axles:
    Front Hub – QR 9×100, QR Torque Caps, 15×100, 15×100 Torque Caps, 20×110, 15×110, 15×110 Torque Caps.
    Rear Hub – QR 10×135, 12×135,12×135 XD, 12×142, 12×142 XD,12×148, 12×148 XD.
  • Available in XD or 10-speed driver body
  • BOOST 148 compatible
  • Weight: 1810g (27.5”), 1900g (29”). Wheel pair in lightest configuration. Wheel weights can vary 5%.
  • Build: 24 double butted sp0kes in 2 cross pattern
  • Available: July 2015

Technologies

DOUBLE TIME

Ratcheting up the smarts. This straight aligned, 4-pawl design turns the
26-tooth ratchet ring into 52 points of contact. The result: smooth
6.9-degree engagement without reducing tooth size or offsetting internal
geometry—which means serious long-term durability.

SPEEDBALL 

The only adjustment they’ll ever need was made back at the factory.
Every part of the ball bearing comes from the exact same supplier—which
means that each bearing bore can be precision machined to fit the
bearing race exactly. With tolerances this tight, the days of adjusting
play after every ride are over.

SOLO SPOKE

With SOLO SPOKE,
you’re never wrong. SRAM wheel design eliminates the need for different
spoke lengths—one size fits the entire wheel. This identical-length
design means no longer wondering whether you have the right
front/rear/drive-side/ nondrive-side spoke handy.

TAPER CORE 

Strong in the right places. The sidewalls of SRAM rims are reinforced
along the wings to withstand major impact. But the sidewalls then taper
in along the center—reducing overall mass. The result is a very light
rim with excellent dent resistance.

WIDE ANGLE

Take corners as fast as you want. SRAM wheels have a wider rim profile
without significant added mass. This profile holds tire shape better,
preventing tire roll and giving you superior comfort and traction around
corners.

XD DRIVER BODY
 

XD is a cassette driver body design
that allows the use of a 10-tooth small cog and provides an improved
interface with the cassette.

BOOST

BOOST is a new wheel and
drivetrain specification that provides: increased wheel stiffness and
durability, better riding efficiency and bike handling precision,
improved frame geometry with shorter chain stays, wider and stiffer
suspension pivots, wider range of chainring options, more clearance for
bigger tires.

Pricing

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