Flow Jr 20
Rocky Mountain
Dirt Jump
Flow Jr 20 is an alloy dirt jump mountain bike (2024), by Rocky Mountain, from the Flow lineup. It is best suited to riders looking for a balanced off-road setup, leaning toward a balanced riding position, while being more at home in gravity-focused bike park riding. Metric-wise, it stands out for strong climbing friendliness for sustained uphill riding and strong value-for-money versus many similar bikes. At the same time, compared with more specialized alternatives, the compromise is a firmer ride feel than comfort-first options and less emphasis on outright speed than speed-focused builds. If this looks close to what you want, compare this bike on MatchBikes.com against similar models.
Rating

Score Summary
Performance
Built for speed and efficiency
Fit
Dialed-in Fit & Comfort
Value
Specifications
General
Frame
Drivetrain
Wheels
Brakes
Cockpit
Seat
Geometry
| Measurement | kids |
|---|---|
| Stack Reach Ratio | 1.335 mm |
| Front Center | 557 mm |
| Rake | 40 mm |
| Stack | 454 mm |
| Reach | 340 mm |
| Top Tube Length | 462 mm |
| Seat Tube Angle | 75 ° |
| Seat Tube Length | 240 mm |
| Head Tube Angle | 68.5 ° |
| Head Tube Length | 100 mm |
| Chainstay Length | 310 mm |
| Wheelbase | 866 mm |
| Bottom Bracket Drop | 15 mm |
| Standover Height | 604 mm |
| Wheels | 20" |
| Rider Min Height | 120 cm |




























































