Instinct Carbon 99

Rocky Mountain splits the Instinct lineup across aluminum and carbon frames, with wheel sizes scaled by frame size. Extra-small and small frames use 27.5-inch wheels, while larger sizes roll on 29ers. The entry-level Alloy models offer an accessible starting point, though reviewers note the base Alloy 10 pushes the limits of its budget-focused fork and brakes. Moving up the ladder, the Carbon 50 and Carbon 70 builds represent the sweet spot for value. The Carbon 70, in particular, equips the bike with highly adjustable Fox Performance Elite suspension and a reliable Shimano XT drivetrain, leaving little need for immediate upgrades beyond personal tire preferences.

Only the carbon frames include the PenaltyBox 2.0 downtube storage system. At the top of the range, the Carbon 99 build shifts to a slightly longer 160mm fork and features RockShox Flight Attendant electronic suspension, carbon wheels, and a SRAM XX Transmission drivetrain complete with a power meter. Across most mid-tier builds, the stock Maxxis Dissector tires prioritize fast rolling speeds, though aggressive riders frequently swap them for heavier-casing alternatives to match the frame's descending capabilities.

Reviewers consistently characterize the Instinct as an agile, energetic trail bike that thrives on rider input. Rather than muting the trail, the suspension and chassis encourage hopping, pumping, and precise line choices. One tester described its character as a "playful, responsive, and sneaky fast fox" (Jeffkendallweed) that excels when ridden dynamically. Cornering is a frequent highlight, aided by a carbon frame that intentionally incorporates a degree of lateral flex. This compliance allows the bike to "bend around turn apexes" (GearJunkie), creating a smooth, carving sensation at speed.

While climbing traction is widely praised, opinions diverge sharply on the factory shock tune. Several testers found the suspension supportive and calm, but others felt the stock compression damping was too light for aggressive riding. One review noted the rear end had a "wallowy mid-stroke" (Pinkbike) that could feel unstable when pushed hard through rough terrain. This active suspension feel also leads to occasional pedal strikes on technical climbs. Additionally, multiple reviewers pointed out that the frame can be noisy over chatter due to internal cable rattle. Despite these critiques, the consensus points to a highly capable descender that climbs competently, provided the rider takes the time to dial in the extensive geometry and suspension settings.