RMK-PRO 800

2015 Polaris Snowmobiles RMK Assault 155 2.125" Series 5.1

Lightest. Strongest. Most flickable.Standard Features May Include:LIGHTEST

• The RMK Assault is Polaris’s “mountain / deep snow / hill-climb competition” snowmobile — built for aggressive mountain riding, backcountry powder, and even competitions like hill-climbs. 

• It’s based on the PRO-RIDE RMK chassis with carbon-fiber overstructure, giving a light but strong platform optimized for deep snow and rough terrain.

• So if yours is an “Assault 155 2.125″ Series 5.1”, it means it came from the factory with the 155-inch skid and likely the 2.125" competition track (though “Series 5.1” suggests it could be swapped to the taller-lug track). In short: it’s a purpose-built mountain / backcountry sled for aggressive terrain, not a general-purpose trail sled.

Features May Include: 

• Deep powder, big mountain terrain: With the 2.4″ Series 5.1 powder track option and lightweight RMK coil-over suspension + carbon-chassis, it floats well in deep snow. 

• Hillclimb / Backcountry / Rocky Terrain / Rock Gardens: The chaincase drive, robust suspension, and competition-grade shocks make it rugged enough for aggressive terrain (e.g., big drops, launches, cornice hits).

• Snowmobiling “flickability”: Its light weight (~435 lb), slim profile, adjustable ski stance, and agile chassis make it easier to maneuver on sidehills, narrow gullies, and tight mountain trails. 

• Versatility of track setups: Riders can tailor the machine to their style — competition / mixed terrain with the 2.125" track, or deep snow / powder focus with the 2.4" Series 5.1.