Mondraker Sly RR Bike

The Mondraker Sly RR Bike makes a confident argument for aluminum in the light e-MTB segment. Built on a hydroformed 6061 Alloy Stealth EVO frame with Mondraker's signature Forward Geometry, the Sly RR delivers legitimate trail performance — slack enough to inspire confidence on technical descents, efficient enough to climb all day — without the carbon-fiber pricing that typically accompanies this level of suspension and component spec. At $7,999, this is a serious electric mountain bike positioned for riders who want real capability, not just assisted pedaling.

The motor at the heart of the Sly RR is the Bosch Performance Line SX, a compact, trail-optimized unit producing 55Nm of torque. It's the lightest Bosch motor available for trail riding, and it shows in how the bike handles: the assistance feels natural and intuitive rather than intrusive. Power delivery responds to your input and cadence rather than overwhelming it, making the Sly RR feel more like a very capable mountain bike than a machine that happens to have a motor. The Bosch Compact Powertube 400Wh battery is integrated into the downtube, and the system is compatible with Bosch's 250Wh bottle-cage-mounted range extender for riders who want to push deeper into the backcountry without watching the gauge drop.

Geometry is where Mondraker has always stood apart. Forward Geometry — the brand's philosophy of designing around reach and rider position — results in a 64.5° head angle across all sizes, slack enough to handle fast, technical terrain without requiring aggressive counter-input, paired with a 74° seat tube angle that keeps you in a powerful pedaling position on extended climbs. Rear suspension uses Mondraker's Updated Zero Suspension System, a two-link co-rotating design with 150mm of travel, driven by a Fox Float X Performance EVOL shock. Up front, a Fox 36 Float Performance GRIP fork handles 160mm of travel with a three-position compression adjustment for tuning to the trail. Chainstays hold at 455mm across all five sizes, giving the Sly RR a consistent handling character regardless of which frame you're on.

Design Benefits

1. Forward Geometry built for technical terrain: The 64.5° head angle and reach figures from 440mm (S) to 520mm (XL) put you in a low, committed position that inspires confidence at speed. The 74° seat tube angle keeps you over the pedals on the way up — geometry that works for the full ride, not just the descent.
2. Bosch Performance Line SX — power without the weight penalty: The SX is one of the lightest Bosch motors built for trail riding, delivering 55Nm of cadence-responsive torque. The assist feels additive rather than dominant — it amplifies your effort on climbs and technical sections without making the bike feel motor-led when things get rowdy.
3. Fox suspension — front and rear: The Fox 36 and Fox Float X Performance EVOL is a proven pairing for this travel bracket. Both units are tunable: the fork runs a three-position compression adjuster, the shock a two-position damper. You can set the Sly RR up for long, mellow trail rides or dial it tighter for more demanding terrain.
4. Size-specific dropper post travel: The Onoff Pija dropper is spec'd with travel matched to each frame size — 140mm on a small up to 210mm on large and XL. A full-size dropper that actually clears the saddle gives you the confidence to attack technical descents instead of spending them with a saddle still half in the way.
5. Maxxis Minion combo on tubeless-ready Mavic wheels: The DHF / DHR II pairing in 29x2.5 WT is one of the most trusted combinations in trail and enduro riding. Matched to Mavic E-CrossTrail SL wheels with 30mm internal width and hookless rim beds, the setup is ready for tubeless from the first ride.
6. SRAM GX Eagle AXS T-Type wireless shifting: Electronic shifting eliminates the cable routing complexity that can be challenging on a frame already managing motor and display wiring. The AXS Pod MMX shifter sits cleanly on the bar and snaps through 12 speeds reliably — no cables to stretch, no barrels to index.

Final Take

The Mondraker Sly RR electric mountain bike is built around a clear premise: an e-MTB should make you a better rider on more terrain, not simply a faster one on easy terrain. The Bosch Performance Line SX provides assist that feels proportional and honest — genuinely useful on long climbs and sustained technical sections, but subtle enough that skill and technique still matter. The Forward Geometry frame, Fox suspension at both ends, and Maxxis tire spec give the Sly RR legitimate downhill credibility, while the wireless SRAM drivetrain and size-tuned dropper post reflect real attention to detail across all five sizes. For riders looking for a light e-MTB that performs at its price point without demanding a carbon-fiber budget to get there, the Sly RR is the bike to ride.