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Transition Sentinel Alloy Deore Complete Mountain Bike 2025

sku# 258553
Transition - Sentinel Alloy Deore Complete Mountain Bike 2025
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Product Info

The new Transition Sentinel Alloy Deore Complete Mountain Bike is a long-term love story between riders and their bikes. Building on the success of Transition's most sought after bike, it has a similar silhouette to its predecessor with subtle tweaks to improve ride performance and kinematics. Its lively geometry mirrors the sporty feel of the Smuggler and Spur, making it more dynamic and playful while maintaining the long travel power and stability you need on rough descents. Available in a sturdy and economic aluminum build, it has everything you need to push yourself to new levels on the trail.

Product Details

Key Features

Sentinel Alloy Frame

Travel160mm Front (150mm Compatible) / 150mm Rear

Wheel Size29" " (X-Small 27.5")

Refined Tuning and Kinematics Create a Lively, Progressive PlatformThe new Sentinel may have a similar silhouette, but Transition have fully redesigned the frame with updated industrial design, features, and geometry to turn it up a notch. The leverage curve supports the bike higher in its travel, leaving plenty of room for big hits while keeping it light on its feet to remain nimble, and quick everywhere else. This gives it the lively, sporty attitude felt in the Spur and Smuggler without sacrificing its capabilities in rougher terrain. New size specific chainstays and a 64 degree headtube angle keep riders balanced with great traction on climbs and descents. All of this creates a bike that encourages new riders to push their limits, while ensuring a seasoned pro feels none. You will be ready to Send-it-all

Geo Adjust ChipThe lower shock mount has a geo-adjust flip chip to accommodate mixed wheels, and features a new design that allows water, dirt and debris to easily wash away. Change the attitude of the bike with a simple flip of a chip. High and Low settings give you two very usable geo settings to suit your riding style: High is comparable to most other companies' low settings so there's a high shred warning in effect!

New Cable Routing PortsCable ports on the side of the headtube allow for easy and simple cable routing with customizable routing for mechanical or wireless shifting as well as left or right rear brake routing. The new port stops cables from getting kinked during a crash and holds them tight to prevent rattling. If you aren’t using the port at all, simply cover it with the supplied insert to prevent dirt or water getting inside your frame, as well as keeping a clean aesthetic. These ports help improve the look and quality of the frame, while remaining functional and simple for maintenance.

Main Pivot Mud GuardThe Sentinel comes with a pre-installed mud guard to protect the main pivot area, improving the bearing life.

Size Specific Chainstays (XS 436, SM/MD 442, LG/XL/XXL 448)The Sentinel has size-specific chainstay lengths to provide balanced handling and rider weight distribution across the range of sizes.

Increased Size Range (XS-XXL)

Specs

  • Biking Type: Mountain More 
    Mountain
  • Used For: Trail, Enduro More 
    Trail Enduro
  • Suspension: Full Suspension More 
    Full Suspension
  • Frame Material: Aluminum Alloy More 
    Aluminum Alloy
  • Gearing: 1 x 12
  • Water Bottle Mounts: 1
  • Fork: RockShox Psylo Gold RC More 
  • Stanchion Diameter (mm): 36
  • Fork Travel (mm): 160
  • Rear Shock: RockShox SuperDeluxe Base
  • Rear Travel (mm): 150
  • Shifters: Shimano Deore More 
  • Rear Derailleur: Shimano Deore M6100, 12-Speed More 
  • Crankset: Shimano Deore M6100 More 
  • Cassette: Shimano Deore M6100, 10-51t More 
  • Chain: Shimano Deore M6100 More 
  • Bottom Bracket: 73mm Threaded
  • Pedals: Not Included
  • Brake Levers: Shimano Deore
  • Brake Calipers: Shimano Deore M6120
  • Rotors: Shimano RT66 (203mm)
  • Headset: FSA NO.57E
  • Handlebar: RaceFace Chester XS/SM(800x20mm) MD/LG/XL/XXL(800x35mm)
  • Bar Tape/Grips: ODI Elite Flow
  • Stem: RaceFace Aeffect R (40mm)
  • Saddle: SDG Bel Air V3
  • Seatpost: SDG Tellis Dropper More 
  • Wheelset: WTB ST i30 More 
  • Hubs: Novatech D791SB/D902SB
  • Rims: WTB ST i30
  • Spokes: Pillar Double Butted
  • Tires: Maxxis
  • Front Tire: Maxxis Assegai 2.5" | 3C, EXO+ More 
  • Rear Tire: Maxxis Minion DHR II 2.4" | 3C, EXO, TR More 
  • Warranty: Limited Lifetime
Size XS S M L XL XXL
Rider Height 4'8" - 5'2" 5' - 5'6" 5''4" - 6' 5'9" - 6'3" 6 - 6'7" 6'2" - 6'8"
Reach (mm) 415 430 455 480 505 530
Stack (mm) 592 615 621 633 642 651
Effective Top Tube (mm) 534 557 586 614 642 660
Seat Tube (mm) 360 360 390 430 460 490
Head Tube Angle (°) 64.0 64.0 64.0 64.0 64.0 64.0
Seat Tube Angle (°) 79.2 78.7 77.9 77.3 77.3 76.5
Chainstay Length (mm) 434 442 442 446 446 446
Bottom Bracket Height (mm) 340 350 350 350 350 350
Bottom Bracket Drop (mm) 15 25 25 25 25 25
Head Tube Length (mm) 100 100 110 120 130 140
Wheelbase (mm) 1171 1208 1237 1271 1300 1330
Complete Weight (lbs) 36.4
Complete Weight (kg) 16.51
Wheel Size 27.5"​+ 29" 29" 29" 29" 29"

Other Notes

Transition products can only be shipped within the United States

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