2026 Trek Bikes Marlin 4 Gen 3 Base S
Build
650B/27.5 in × 2.4 in
Insights
Very aggressive stack and reach vs trend of hardtail trail mtb bikes
Design deviates from other sizes of Trek Bikes Marlin 4 Gen 3
Suspension sag unknown
Geometry may mis-represent actual riding geometry
Stack and Reach vs. Category Trend
View all sizes
Geometry
| Stack | 572mm |
| Reach | 415mm |
| Stack to Reach Ratio | 1.38:1 |
| Seat Tube Length, C-T | 370mm |
| Top Tube Length, Effective/Horizontal Center | 579mm |
| Top Tube Slope | 22.7deg |
| Head Tube Angle | 66.5deg |
| Seat Tube Angle | 73.8deg |
| Seat Tube Exit Angle | 74deg |
| Head Tube Length | 100mm |
| Bottom Bracket Drop | 45mm |
| Bottom Bracket Height | 308mm |
| Chainstay Length | 433mm |
| Chainstay Length Horizontal | 430.7mm |
| Front-Center | 691.8mm |
| Front-Center Horizontal | 690.3mm |
| Wheelbase | 1121mm |
| Fork Offset/Rake | 42mm |
| Trail | 107.7mm very high |
| Mechanical Trail | 98.7mm |
| Wheel Flop | 39.4mm |
| Standover Height | 692mm |
| Tire to Pedal Spindle Distance With 170 mm cranks | 168.9mm |
| Pedal Spindle to Ground Clearance With 170 mm cranks | 138mm |
Base Build
| Wheel Size | 650B, 27.5 inch (584mm BSD) |
| Tire Width | 2.4in |
| Tire Outer Diameter | 705.9mm |
| Bike Length with Tires | 1826.9mm |
| Handlebar Width | 720mm |
| Stem Length | 35mm |
| Stem Angle | 7deg |
| Suspension Type | Hardtail (Front suspension) |
| Bar Type | Flat Bar |
| Fork Travel | Unknown |
| Suspension Sag | Unknown |
| Frame Material | Unknown |
| Fork Material | Unknown |
| Brake Type | Unknown |
Source:https://www.trekbikes.com/gb/en_GB/bikes/mountain-bikes/cross-country-mountain-bikes/marlin/f/F321/marlin-4-gen-3/57361/5336958