1985 Trek Bikes 720 Base 21in
Build
630mm BSD × 1.25 in
Stack and Reach vs. Category Trend
View all sizes
Geometry
| Stack | 532.6mm |
| Reach | 397.9mm |
| Stack to Reach Ratio | 1.34:1 |
| Seat Tube Length, C-C | 522mm |
| Top Tube Length, Effective/Horizontal Center | 561mm |
| Top Tube Length, Actual C-C | 561mm |
| Top Tube Slope | 0deg |
| Head Tube Angle | 72.5deg |
| Seat Tube Angle | 73deg |
| Bottom Bracket Drop | 72mm |
| Bottom Bracket Height | 274.8mm |
| Chainstay Length | 470mm |
| Chainstay Length Horizontal | 464.5mm |
| Front-Center | 601.9mm |
| Front-Center Horizontal | 597.6mm |
| Wheelbase | 1062mm |
| Fork Offset/Rake | 52mm |
| Trail | 54.8mm mid/neutral |
| Mechanical Trail | 52.3mm |
| Wheel Flop | 15.7mm |
| Tire to Pedal Spindle Distance With 170 mm cranks | 85.1mm |
| Pedal Spindle to Ground Clearance With 170 mm cranks | 104.8mm |
Base Build
| Wheel Size | 630mm BSD |
| Tire Width | 1.25in |
| Tire Outer Diameter | 693.5mm |
| Bike Length with Tires | 1755.5mm |
| Suspension Type | Rigid, non-suspension corrected |
| Bar Type | Drop Bar |
| Frame Material | Steel |
| Fork Material | Steel |
| Brake Type | Rim |
Source:https://vintage-trek.com/images/trek/85TrekTouring.pdf