Reign SX
Giant
Downhill
Reign SX is an alloy downhill mountain bike (2023), by Giant, from the Reign lineup. Rider-wise, it fits riders who want a more active, performance-leaning off-road feel, leaning toward a sporty, active riding position, while being more at home in gravity-focused bike park riding. Metric-wise, it stands out for capable suspension support for rougher terrain, good fit flexibility for dialing in rider position, and all-round climbing capability rather than a narrow specialty. What it gives up slightly is a firmer ride feel than comfort-first options and less emphasis on outright speed than speed-focused builds. Compare this bike on MatchBikes.com to similar downhill 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 | MD High | MD Mid | LG High | LG Mid | XL High | XL Mid |
|---|---|---|---|---|---|---|
| Stack Reach Ratio | 1.39 mm | 1.41 mm | 1.35 mm | 1.37 mm | 1.28 mm | 1.29 mm |
| Bottom Bracket Height | 336 mm | 330 mm | 336 mm | 330 mm | 336 mm | 330 mm |
| Front Center | 786 mm | 786 mm | 841 mm | 841 mm | 874 mm | 874 mm |
| Rake | 56 mm | 56 mm | 56 mm | 56 mm | 56 mm | 56 mm |
| Trail | 127 mm | 130 mm | 127 mm | 130 mm | 127 mm | 130 mm |
| Stack | 623 mm | 626 mm | 632 mm | 635 mm | 636 mm | 639 mm |
| Reach | 447 mm | 443 mm | 467 mm | 463 mm | 498 mm | 494 mm |
| Top Tube Length | 578 mm | 579 mm | 611 mm | 612 mm | 643 mm | 644 mm |
| Seat Tube Angle | 78.3 ° | 77.9 ° | 77.3 ° | 77 ° | 77.3 ° | 77 ° |
| Seat Tube Length | 425 mm | 425 mm | 450 mm | 450 mm | 475 mm | 475 mm |
| Head Tube Angle | 63.5 ° | 63.1 ° | 63.5 ° | 63.1 ° | 63.5 ° | 63.1 ° |
| Head Tube Length | 105 mm | 105 mm | 115 mm | 115 mm | 120 mm | 120 mm |
| Chainstay Length | 433 mm | 434 mm | 433 mm | 434 mm | 433 mm | 434 mm |
| Wheelbase | 1218 mm | 1219 mm | 1273 mm | 1274 mm | 1306 mm | 1307 mm |
| Bottom Bracket Drop | 19 mm | 25 mm | 19 mm | 25 mm | 19 mm | 25 mm |
| Standover Height | 733 mm | 728 mm | 746 mm | 741 mm | 762 mm | 757 mm |
| Wheels | 27" | 27" | 27" | 27" | 27" | 27" |
| Rider Min Height | 171 cm | 171 cm | 178 cm | 178 cm | 186 cm | 186 cm |
| Rider Max Height | 181 cm | 181 cm | 189 cm | 189 cm | 196 cm | 196 cm |




























































