1989 Trek Bikes 4 Series 420 21"
Build
700C/29 in × 28 mm
Insights
Very aggressive stack and reach vs trend of sport touring bikes
Design deviates from other sizes of Trek Bikes 4 Series
Stack and Reach vs. Category Trend
View all sizes
Geometry
| Stack | 504.7mm |
| Reach | 394.5mm |
| Stack to Reach Ratio | 1.28:1 |
| Seat Tube Length, C-T | 526mm |
| Top Tube Length, Effective/Horizontal Center | 545mm |
| Top Tube Length, Actual C-C | 545mm |
| Top Tube Slope | 0deg |
| Head Tube Angle | 72deg |
| Seat Tube Angle | 73.5deg |
| Bottom Bracket Drop | 72mm |
| Bottom Bracket Height | 267mm |
| Chainstay Length | 430mm |
| Chainstay Length Horizontal | 423.9mm |
| Front-Center | 589.5mm |
| Front-Center Horizontal | 585.1mm |
| Wheelbase | 1009mm |
| Fork Offset/Rake | 45mm |
| Trail | 62.8mm mid/neutral |
| Mechanical Trail | 59.8mm |
| Wheel Flop | 18.5mm |
| Tire to Pedal Spindle Distance With 170 mm cranks | 80.5mm |
| Pedal Spindle to Ground Clearance With 170 mm cranks | 97mm |
420 Build
| Wheel Size | 700C, 29 inch (622mm BSD) |
| Tire Width | 28mm |
| Tire Outer Diameter | 678mm |
| Bike Length with Tires | 1687mm |
| Suspension Type | Rigid, non-suspension corrected |
| Bar Type | Drop Bar |
| Frame Material | Steel |
| Fork Material | Steel |
| Brake Type | Rim |
Source:http://vintage-trek.com/images/trek/Trek89Brochure.pdf