2026 Dartmoor Bikes Thunderbird FR Pro Gx Medium
Build
650B/27.5 in × 63 mm
Insights
Somewhat upright stack and reach vs trend of full-suspension downhill/freeride mtb bikes
Stack and Reach vs. Category Trend
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Geometry
| Stack | 652mm |
| Reach | 470mm |
| Stack to Reach Ratio | 1.39:1 |
| Seat Tube Length, C-T | 430mm |
| Top Tube Length, Effective/Horizontal HT Top | 570mm |
| Head Tube Angle | 63.5deg |
| Effective Seat Tube Angle, ETT HT Top | 81deg |
| Head Tube Length | 110mm |
| Bottom Bracket Drop | 34mm |
| Bottom Bracket Height | 321mm |
| Chainstay Length | 430mm |
| Chainstay Length Horizontal | 428.7mm |
| Front-Center | 834mm |
| Front-Center Horizontal | 833.4mm |
| Wheelbase | 1262mm |
| Fork Offset/Rake | 44mm |
| Fork Length (Axle-To-Crown) | 606mm |
| Trail | 127.8mm very high |
| Mechanical Trail | 114.4mm |
| Wheel Flop | 51.1mm |
| Standover Height | 795mm |
| Tire to Pedal Spindle Distance With 170 mm cranks | 309mm |
| Pedal Spindle to Ground Clearance With 170 mm cranks | 151mm |
Pro Gx Build
| Wheel Size | 650B, 27.5 inch (584mm BSD) |
| Tire Width | 63mm |
| Tire Outer Diameter | 710mm |
| Bike Length with Tires | 1972mm |
| Stem Length | 35mm |
| Stem Angle | 0deg |
| Suspension Type | Full suspension |
| Bar Type | Flat Bar |
| Fork Travel | 190mm |
| Rear Travel | 180mm |
| Suspension Sag | 30% |
| Frame Material | Aluminum |
| Fork Material | Aluminum |
| Brake Type | Disc |
Source:https://dartmoor-bikes.com/hardware/freeridejib/thunderbird-fr-pro-gx