2025 Xiamen Carbon Speed CS-121 Base XL
Build
700C/29 in × 2.35 in
Insights
Somewhat aggressive stack and reach vs trend of full-suspension cross-country mtb bikes
Suspension sag unknown
Geometry may mis-represent actual riding geometry
Stack and Reach vs. Category Trend
View all sizes
Geometry
| Stack | 606.3mm |
| Reach | 491.3mm |
| Stack to Reach Ratio | 1.23:1 |
| Seat Tube Length, C-T | 520mm |
| Top Tube Length, Effective/Horizontal Center | 647mm |
| Top Tube Slope | 9.4deg |
| Head Tube Angle | 66.5deg |
| Seat Tube Angle | 75.6deg |
| Head Tube Length | 130mm |
| Bottom Bracket Drop | 36mm |
| Bottom Bracket Height | 334.7mm |
| Chainstay Length | 440mm |
| Chainstay Length Horizontal | 438.5mm |
| Front-Center | 788mm |
| Front-Center Horizontal | 786.5mm |
| Wheelbase | 1225mm |
| Fork Offset/Rake | 44mm |
| Trail | 113.2mm very high |
| Mechanical Trail | 103.8mm |
| Wheel Flop | 41.4mm |
| Tire to Pedal Spindle Distance With 170 mm cranks | 247.3mm |
| Pedal Spindle to Ground Clearance With 170 mm cranks | 164.7mm |
Base Build
| Wheel Size | 700C, 29 inch (622mm BSD) |
| Tire Width | 2.35in |
| Tire Outer Diameter | 741.4mm |
| Bike Length with Tires | 1966.4mm |
| Suspension Type | Full suspension |
| Bar Type | Flat Bar |
| Fork Travel | 120mm |
| Rear Travel | 120mm |
| Suspension Sag | Unknown |
| Frame Material | Unknown |
| Fork Material | Unknown |
| Brake Type | Disc |
Source:https://www.xmcarbonspeed.cc/products/cs-121-mtb-frame