1981 Trek Bikes 510 Base 25 1/2
Build
650B/27.5 in × 42 mm
Insights
Very upright stack and reach vs trend of sport touring bikes
Design deviates from other sizes of Trek Bikes 510
Stack and Reach vs. Category Trend
View all sizes
Geometry
| Stack | 634.4mm |
| Reach | 390.6mm |
| Stack to Reach Ratio | 1.62:1 |
| Seat Tube Length, C-C | 630mm |
| Top Tube Length, Effective/Horizontal Center | 590mm |
| Top Tube Length, Actual C-C | 590mm |
| Top Tube Slope | 0deg |
| Head Tube Angle | 73.5deg |
| Seat Tube Angle | 72.5deg |
| Chainstay Length | 435mm |
| Fork Offset/Rake | 45mm |
| Trail | 52mm mid/neutral |
| Mechanical Trail | 49.9mm |
| Wheel Flop | 14.2mm |
| Tire to Pedal Spindle Distance With 170 mm cranks | — |
| Pedal Spindle to Ground Clearance With 170 mm cranks | — |
Base Build
| Wheel Size | 650B, 27.5 inch (584mm BSD) |
| Tire Width | 42mm |
| Tire Outer Diameter | 668mm |
| Suspension Type | Rigid, non-suspension corrected |
| Bar Type | Drop Bar |
| Frame Material | Steel |
| Fork Material | Unknown |
| Brake Type | Unknown |
Source:http://www.vintage-trek.com/images/trek/79_80_81/81Trek3_150.jpg