The Sentinel rides the lines between planted bottomless sender and playful, poppy trail pony. This leaves it right in the sweet spot, as we like to call it. It&';s versatile attitude helps riders excel and push their limits, making it the one bike most will need. Its intuitive nature is easy to get acquainted with; you&';ll find yourself sending lines, jumps, and maneuvers you always felt were beyond your ability. Where before you went around, now you go over. Where you pushed up, now you pedal. Where you rolled, now you boost. It&';s time to Send-It-All. Product Transition Sentinel Alloy Eagle 90 Bike Model Year 2025 Intended Use Enduro / All-Mountain Rider Unisex Sizes and Geometry XS 27.5" SM (29", MX) MD (29", MX) LG (29", MX) XL (29", MX) XXL (29", MX) View Full Geometry Wheel Size 27.5" (650b) 29" Frame Material Aluminum Frame Material Details Molded chainstay, seatstay, and lower down tube protection Rear Travel 150mm Rear Shock RockShox Super Deluxe Select+, 205mm length x 60mm stroke Fork RockShox Lyrik Select+, 35mm stanchions Fork Travel 160mm Head Tube Diameter Tapered, 1.125" top, 1.5" bottom Headset FSA No.57E, ZS44 upper, ZS56 lower Handlebar ANVL Mandrel Alloy, 800mm width, 35mm clamp diameterRise: 20mm (XS/SM), 30mm (MD-XL), 40mm (XXL) Stem ANVL Swage, 40mm length, 35mm bar clamp Grips ODI Elite Flow, lock-on Brakes SRAM Maven Bronze, 4-pistonRotors: SRAM CenterLine, 200mm Brake Levers SRAM Maven Bronze Stealth, tool-free reach adjust Drivetrain 1x Shifters SRAM Eagle 90 Transmission, 12-speed, MMX mounting bracket Front Derailleur None Rear Derailleur SRAM Eagle 90 Transmission, 12-speed ISCG Tabs ISCG05 Chainguide None Cranks SRAM Eagle 90 Transmission Alloy DUB, 165mm length Chainrings SRAM Eagle 90 Transmission, 30 tooth Bottom Bracket SRAM DUB, 73mm English/BSA threaded Pedals None Chain SRAM GX Eagle Transmission Flattop, 12-speed Cassette SRAM GX Eagle Transmission XS-1275, 12-speed, 10-52 tooth Rims DT Swiss M 1900 Spline 30 Alloy, 30mm inner width Hubs DT Swiss 370, 15mm x 110mm (Boost) front, 12mm x 148mm (Boost) rear with Ratchet LN freehub and XD driver Spokes DT Swiss Champion Tires Front: Maxxis Assegai, 3C MaxxTerra compound, EXO+ casing, 2.5"Rear: Maxxis Minion DHR II, 3C MaxxTerra compound, EXO+ casing, 2.4" Saddle SDG Bel-Air V3 Seatpost OneUp dropperDrop: 120mm (XS), 150mm (SM), 190mm (MD), 210mm (LG), 240mm (XL/XXL) Seatpost Diameter 31.6mm Seatpost Clamp Single bolt, 34.9mm Rear Dropout / Hub Dimensions 12mm x 148mm (Boost) Max. Tire Size 2.5" Bottle Cage Mounts One inside front triangle, plus accessory mounts under top tube Colors Deep Purple, Graphite Grey, Glacier White Warranty Lifetime frame Weight Miscellaneous a V3 versiona GiddyUp four-bar Horst-link rear suspension designa XS has 27.5" wheels; SM-XXL have 29" wheels front/rear with option of mixed ("Mullet") wheels (29" front, 27.5" rear) via two-position flip chip at lower shock mounta Rear travel can be increased to 160mm with longer-stroke (65mm) shocka Internal cable routing; cable ports on the side of the headtube allow for customizable options for mechanical or wireless shifting as well as left or right rear brake setupsa SRAM UDH (Universal Derailleur Hanger)a Frame weight, size MD with shock: 9.91 lbs (4.5 kg)Includes:a Pre-installed integrated mud guard to protect the main pivot areaa Tubeless valves and sealanta Fidlock Twist Bike Base bottle mount