In pursuit of pure speed on XC trails, the Stumpjumper makes no sacrifices in terms of weight, efficiency, agility, or ride quality. As the most technologically advanced cross-country hardtails available, they are ruthlessly built to pedal hard, climb fast, and beat everyone on the World Cup circuit or local trails.
WHAT 90mm-travel Brain-modulated
fork on mid to high-end models,
with dropouts compatible with our
proprietary OS 28 end caps.
WHY Delivers the most efficient climbing
and out-of-the-saddle acceleration,
while retaining smooth, active
suspension when taking hits.
HOW Brain technology (inside the fork) senses
the difference between rider-induced and
bump-induced forces, using an inertia
valve and oil flow to regulate suspension.
When a rider stands to accelerate, the
fork immediately stiffens up, eliminating
rider “bob.” But when taking a hit, the
fork is allowed to compress accordingly.
OS 28 end caps make the interface
between the hub and fork considerably
stiffer than standard QRs, making the
fork even more efficient and responsive.
FACT IS Carbon Fr ame
WHAT Ultra-light FACT IS carbon frame
with shaped seatstays, Competitive
XC geometry, and slim seatpost.
WHY Keeps the bike remarkably light—26”
frame weighs less than 1000
grams!—without sacrificing torsional
stiffness or vertical compliance.
Results in increased speed, comfort,
and control over rough terrain.
HOW FACT IS construction lets us create
complex carbon shapes that maximize
stiffness and minimize weight and stress/
alignment issues. The geometry—featuring
our tapered “ ” head tube and
short chainstays—provides superior
handling and snappy acceleration.
The shaped seatstays and slimmer
seatpost increase vertical compliance.
WHAT Roval Control SL 29 wheelset with
carbon rims (S-Works model only
WHY Reduces weight, increases stiffness
and durability, and absorbs impact
better than alloy wheels.
HOW By designing these rims specifically for
29ers, we can add width for strength
and tire volume, while actually lowering
weight. Because carbon is stronger and
stiffer than alloy, they remain in-true
longer and absorb impact better. A
combination of cross-laced and radiallaced
spoking helps to reduce weight
while increasing stiffness and strength.