2025 Dartmoor Bikes Thunderbird FR Pro Medium
Build
650B/27.5 in × 65 mm
Insights
Average stack and reach vs trend of full-suspension downhill/freeride mtb bikes
Stack and Reach vs. Category Trend
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Geometry
| Stack | 619mm |
| Reach | 445mm |
| Stack to Reach Ratio | 1.39:1 |
| Seat Tube Length, C-T | 430mm |
| Top Tube Length, Effective/Horizontal HT Top | 540mm |
| Head Tube Angle | 65deg |
| Effective Seat Tube Angle, ETT HT Top | 81deg |
| Head Tube Length | 110mm |
| Bottom Bracket Drop | 12mm |
| Bottom Bracket Height | 345mm |
| Chainstay Length | 430mm |
| Chainstay Length Horizontal | 429.8mm |
| Front-Center | 776.3mm |
| Front-Center Horizontal | 776.2mm |
| Wheelbase | 1206mm |
| Fork Offset/Rake | 44mm |
| Fork Length (Axle-To-Crown) | 566mm |
| Trail | 117.9mm very high |
| Mechanical Trail | 106.9mm |
| Wheel Flop | 45.2mm |
| Standover Height | 795mm |
| Tire to Pedal Spindle Distance With 170 mm cranks | 249.3mm |
| Pedal Spindle to Ground Clearance With 170 mm cranks | 175mm |
Pro Build
| Wheel Size | 650B, 27.5 inch (584mm BSD) |
| Tire Width | 65mm |
| Tire Outer Diameter | 714mm |
| Bike Length with Tires | 1920mm |
| Crank Length | 170mm |
| Handlebar Width | 800mm |
| Stem Length | 35mm |
| Stem Angle | 0deg |
| Suspension Type | Full suspension |
| Bar Type | Flat Bar |
| Fork Travel | 180mm |
| Rear Travel | 180mm |
| Suspension Sag | 30% |
| Frame Material | Aluminum |
| Fork Material | Aluminum |
| Brake Type | Disc |
Published Sizing Recommendations
| Height | 167 cm to 182 cm |
Source:https://dartmoor-bikes.com/hardware/freeride/thunderbird-fr-pro-2025