Navi RS100 Hardtail Mountain Bike, Aluminum Alloy Frame, Disc Brakes, Shimano Tourney 21-speed, 27.5" Wheel Mountain Bike (BLACK / RED) 6061 ALUMINUM ALLOY FRAME. FRONT SR SUNTOUR SUSPENSION FORK W/ MANUAL LOCKOUT. ALUMINUM ALLOY HANDLE BAR, STEM, & SEAT POST. PLASTIC PEDALS ARE INCLUDED. SHIMANO TOURNEY 3-SPEED (FRONT) & 7-SPEED (REAR) DERAILLEURS. SHIMANO MF-TZ21 7-SPEED FREEWHEEL. SHIMANO ALUMINUM ALLOY 3-SPEED CRANK SET WITH SEALED BEARING BOTTOM BRACKET. SHIMANO FRONT & REAR DISC BRAKES, 160MM STAINLESS STEEL DISC BRAKE ROTOR. WANDA TIRES. ALUMINUM ALLOY DOUBLE WALL RIMS WITH STAINLESS STEEL SPOKES. MAX. TIRE PRESSURE: 40 LBS. WEIGHT LIMITATION: 200 LBS. FRONT & REAR ALUMINUM ALLOY HUBS WITH QUICK RELEASE. 90% PRE-ASSEMBLED. USER JUST NEED TO INSTALL THE FRONT WHEEL, HANDLE BAR, SEAT, AND PEDALS. THE ADJUSTMENTS OF WHEEL AND BRAKES MAY BE REQUIRED. PROFESSIONAL ASSEMBLY SERVICE IS RECOMMENDED.