Integrated Battery
Batteries intergrated into the downtube provide a sleek look and keep weight low for a stable ride. They are easily removable without additional tools for charging or safe keeping.
ABP
Treks patented Active Braking Pivot allows your suspension to work freely whether you're on the brakes or off. It's smooth, controlled suspension that's at it's best all the time. Learn More
Alpha Platinum Aluminium
Treks premium lightweight aluminium is continuously cold extruded and butted at multiple points, and hydroformed into sophisticated tube shapes for maximum strength and minimum weight.
Boost 148/110
Wider Dropouts (110mm front, 148mm rear) give you the stiffness of a 27.5" wheel with the benifits of a 29" wheel, and Boost148 at the back lets you run wider tyres and a larger chain ring without affecting q-factor and pedalling efficiency.
G2 Geometry
Advance frame geometry and a custom offset fork give Treks 29ers precise handling at low speed without compromising high-speed stability. Trek call it G2 Geometry, and it's why Treks 29ers handle better than anyone elses.
Motor Armor
This unique protection shield made of lightweight but robust aluminium protects the motor against stones.
RE:aktiv
Better flow, better ride
Any mountain biker understands the bliss that comes with zeroing in on the trail and nothing else. No outside distractions—including inconsistent suspension performance. That’s what it’s all about. More flow is RE:aktiv’s greatest gift.
You’ll accelerate as aggressively as you can without losing efficiency to pedal bob. You’ll confidently take gnarly, technical lines knowing that your rear shock will provide an instant, supple response. You’ll feel the difference of a shock that immediately transitions from soft to firm as you fly out of corners. You’ll experience the beauty of simply being in the moment.
RE:aktiv does exactly what you need it to do, exactly when you need it to. No more adjustments on the trail, no more choice between efficiency or control—pure confidence and enjoyment no matter what the trail brings you.
From the racetrack to the gravity park
What do Formula One and mountain biking have in common? Both sports put extreme demands on suspension systems, requiring the utmost stability and control in straights and corners, coupled with the capability to instantaneously respond to sudden bumps. For years, the ultimate challenge for mountain bike suspension engineers has been designing a shock that is firm and supportive while pedalling and in the corners, but capable of being plush and yielding to handle sudden impacts without knocking you off your line.
RE:aktiv is the most efficient technology to do just that. What inertia valves attempted for years has finally been achieved. The RE:aktiv ride is firm under pedalling efforts, but provides a smooth, instantaneous transition to plush control, giving you the confidence to ride your bike as it should be ridden. The key point is that RE:aktiv gives you the best of both worlds all the time. It is not two settings, but an integral part of the rear shock’s design that ensures you’re ready for any obstacle the trail throws your way.
Developed in collaboration with the experts at Penske Racing Shocks, the global leader in custom design for auto racing suspension, and FOX, RE:aktiv is the result of the best minds in suspension design, seeking out the most refined damping technology that mountain biking has ever seen.
Regressive Damping & Formula 1
RE:aktiv’s intuitiveness is a product of its regressive damping system. Proven in the demanding crucible of F1 circuits, regressive damping is dynamic and versatile. Most mountain bike suspension systems employ progressive or digressive damping, which simply do not respond as efficiently to a variety of obstacles. Such systems also have a difficult time transitioning from the active, support and control suspension action required in corners to the pedalling efficiency necessary to regain speed on straightaways or less technical sections of trail.
When Trek’s engineers realised how effective this technology was in Formula One—where drivers encounter bumps and fly into corners at 200 mph (320 kph)—they knew it had an application in our sport. Penske Racing Shocks is the best, so a partnership was formed and prototypes were developed. FOX and Trek brought the expertise needed to scale up Penske’s custom designs, and RE:aktiv was born.
Regressive damping is the most adaptive
Effective damping is a vital component of suspension performance. Damping makes your ride rigid when on the pedals, but it stands in your way when confronting obstacles or ripping through corners.
Regressive damping works when it should, and only when it should, because its engagement is sensitive to shaft velocity. What affects shaft velocity? Most rider inputs, like pedalling, produce low velocity, whereas most environmental inputs are the result of encounters with eruptive shapes, and result in high shaft velocity. With RE:aktiv, inputs that produce low shaft velocity do not affect performance but a threshold exists where anything that exceeds it immediately and dramatically changes the function of the shock. A sudden increase of shaft velocity—or how quickly the shock is trying to compress—opens the suspension up and allows for a supple and controlled response. It’s like having two different shocks on your bike.
Normal rider input cannot produce enough velocity through pedalling to open the shock, which is the basis for RE:aktiv’s ability to distinguish pedalling from environmental inputs that require suspension engagement. When abrupt obstacles are encountered, the shock gets out of its own way. The process reverses as quickly as it begins, meaning that you don’t lose it on the obstacle but don’t sacrifice efficiency in the transition either. The speed of this transition is what gives RE:aktiv its unique feel—one that riders have been seeking for years.
No hesitation
For years, inertia valves provided damping in mountain bike suspension. While this technology is very good at keeping closed and providing efficiency, it is not successful in adapting to changes in the terrain.
RE:aktiv was designed to address the primary drawback of these systems—they require too much input to engage. Because inertia valves respond to G-force, the shock often fails to open up when it should. Your shock may not fully engage until the second or third hit of a techy section, and you sacrifice control and feedback in the meantime.
The problem persists on the other end of the obstacle or corner, where a lag period occurs before the shock realises it is no longer needed and the damping function re-engages. Essentially, inertia valves work, they’re just slow to recognise what’s happening around them. They become easily confused in off-road applications because they don’t easily identify different inputs, and don’t know whether to close or open on variable terrain. Simply put, other technologies lack the intuitiveness and immediate response that RE:aktiv provides.
Set and forget
RE:aktiv was designed to complement existing suspension settings, such as climb and trail modes. RE:aktiv can function effectively in all three settings, allowing you to simply pick the proper setting and let her rip. Wouldn’t it be nice to no longer interrupt your flow to flip between suspension settings during a ride? It simply makes the shock better all the time.
Bosch PowerPack 500
The premium Bosh lithium-ion battery features 500 Wh and a guaranteed long lifespan. The battery not only ensures long distances, but is also easy to remove and take with you.
Bosh Purion Display
Bosch's Purion display features a fully-functional speedometer with a backlit display, service interval indicator and battery range indicator. Its thoughtful design allows riders to scroll through functions or choose the right level of support while maintaining contact with the handlebars.
Straight Shot w/Knock Black
Trek's all-new Straight Shot frame design featuring Knock Block frame defence optimises stiffness-to-weight ratio for a more responsive ride. Learn More
Bosch Performance CX
Bosch's Performance CX line is made for rugged off-road use with a maximum torque of up to 75 newton meters, sustained power into the high cadence range for sporty acceleration and a sleek mid-mount motor for ideal weight balance and obstacle clearance.