2025 Transition Bikes Sentinel Alloy XS
Build
650B/27.5 in × 2.4 in
Insights
Average stack and reach vs trend of full-suspension trail mtb bikes
Design deviates from other sizes of Transition Bikes Sentinel
Suspension sag unknown
Geometry may mis-represent actual riding geometry
Stack and Reach vs. Category Trend
View all sizes
Geometry
| Stack | 592mm |
| Reach | 415mm |
| Stack to Reach Ratio | 1.43:1 |
| Seat Tube Length, C-T | 360mm |
| Top Tube Length, Effective/Horizontal HT Top | 534mm |
| Head Tube Angle | 64deg |
| Effective Seat Tube Angle, ETT HT Top | 79.2deg |
| Head Tube Length | 100mm |
| Bottom Bracket Drop | 15mm |
| Bottom Bracket Height | 338mm |
| Chainstay Length | 434mm |
| Chainstay Length Horizontal | 433.7mm |
| Front-Center | 737.4mm |
| Front-Center Horizontal | 737.3mm |
| Wheelbase | 1171mm |
| Fork Offset/Rake | 37mm |
| Fork Length (Axle-To-Crown) | 560mm |
| Trail | 131mm very high |
| Mechanical Trail | 117.7mm |
| Wheel Flop | 51.6mm |
| Tire to Pedal Spindle Distance With 170 mm cranks | 214.5mm |
| Pedal Spindle to Ground Clearance With 170 mm cranks | 168mm |
Alloy Build
| Wheel Size | 650B, 27.5 inch (584mm BSD) |
| Tire Width | 2.4in |
| Tire Outer Diameter | 705.9mm |
| Bike Length with Tires | 1876.9mm |
| Suspension Type | Full suspension |
| Bar Type | Flat Bar |
| Fork Travel | 160mm |
| Rear Travel | 150mm |
| Suspension Sag | Unknown |
| Frame Material | Aluminum |
| Fork Material | Unknown |
| Brake Type | Disc |
Source:https://www.transitionbikes.com/Bikes/Sentinel