2018 Genesis Bikes Tarn Base S
Build
650B/27.5 in × 2.8 in
Insights
Somewhat upright stack and reach vs trend of hardtail trail mtb bikes
Stack and Reach vs. Category Trend
View all sizes
Geometry
| Stack | 633mm |
| Reach | 415mm |
| Stack to Reach Ratio | 1.53:1 |
| Seat Tube Length, C-T | 370mm |
| Top Tube Length, Effective/Horizontal Unknown | 597mm |
| Top Tube Slope | 28.2deg |
| Head Tube Angle | 68deg |
| Seat Tube Angle | 74deg |
| Head Tube Length | 100mm |
| Bottom Bracket Drop | 55mm |
| Bottom Bracket Height | 308.1mm |
| Chainstay Length | 432mm |
| Chainstay Length Horizontal | 428.5mm |
| Front-Center | 705.7mm |
| Front-Center Horizontal | 703.5mm |
| Wheelbase | 1132mm |
| Fork Offset/Rake | 51mm |
| Trail | 91.7mm very high |
| Mechanical Trail | 85mm |
| Wheel Flop | 31.9mm |
| Standover Height | 759mm |
| Tire to Pedal Spindle Distance With 170 mm cranks | 172.5mm |
| Pedal Spindle to Ground Clearance With 170 mm cranks | 138.1mm |
Base Build
| Wheel Size | 650B, 27.5 inch (584mm BSD) |
| Tire Width | 2.8in |
| Tire Outer Diameter | 726.2mm |
| Bike Length with Tires | 1858.2mm |
| Handlebar Width | 760mm |
| Stem Length | 55mm |
| Suspension Type | Hardtail (Front suspension) |
| Bar Type | Flat Bar |
| Fork Travel | 120mm |
| Suspension Sag | 20% |
| Frame Material | Steel |
| Fork Material | N/A |
| Brake Type | Disc |
Source:https://99spokes.com/en-GB/bikes/genesis/2018/tarn-20 , https://geometrygeeks.bike/bike/genesis-tarn-20-2020/