2025 Xiamen Carbon Speed CS-121 Base
- Design
- Flat Bar, Full suspension
- Suspension
- 120mm fork travel, 120mm rear travel
- Features
- Disc brake
Somewhat aggressive stack and reachvs category Suspension sag unknown Geometry may mis-represent actual riding geometry | Somewhat aggressive stack and reachvs category Suspension sag unknown Geometry may mis-represent actual riding geometry | Somewhat aggressive stack and reachvs category Suspension sag unknown Geometry may mis-represent actual riding geometry | Somewhat aggressive stack and reachvs category Suspension sag unknown Geometry may mis-represent actual riding geometry |
Geometry
S | M | L | XL | |
Stack | 575.1mm | 575.1mm | 588.8mm | 606.3mm |
Reach | 415.3mm | 440.3mm | 465.8mm | 491.3mm |
Stack to Reach Ratio | 1.38:1 | 1.31:1 | 1.26:1 | 1.23:1 |
Seat Tube Length, C-T | 422mm | 441mm | 482mm | 520mm |
Top Tube Length, Effective/Horizontal Center | 563mm | 588mm | 617mm | 647mm |
Top Tube Slope | 17.7deg | 15.1deg | 11.8deg | 9.4deg |
Head Tube Angle | 66.5deg | 66.5deg | 66.5deg | 66.5deg |
Seat Tube Angle | 75.6deg | 75.6deg | 75.6deg | 75.6deg |
Head Tube Length | 96mm | 96mm | 111mm | 130mm |
Bottom Bracket Drop | 36mm | 36mm | 36mm | 36mm |
Bottom Bracket Height | 334.7mm | 334.7mm | 334.7mm | 334.7mm |
Chainstay Length | 440mm | 440mm | 440mm | 440mm |
Chainstay Length Horizontal | 438.5mm | 438.5mm | 438.5mm | 438.5mm |
Front-Center | 698.6mm | 723.6mm | 755mm | 788mm |
Front-Center Horizontal | 697.5mm | 722.5mm | 753.5mm | 786.5mm |
Wheelbase | 1136mm | 1161mm | 1192mm | 1225mm |
Fork Offset/Rake | 44mm | 44mm | 44mm | 44mm |
Trail | 113.2mm very high | 113.2mm very high | 113.2mm very high | 113.2mm very high |
Mechanical Trail | 103.8mm | 103.8mm | 103.8mm | 103.8mm |
Wheel Flop | 41.4mm | 41.4mm | 41.4mm | 41.4mm |
Tire to Pedal Spindle | 157.9mm 170 mm cranks | 182.9mm 170 mm cranks | 214.3mm 170 mm cranks | 247.3mm 170 mm cranks |
Pedal Spindle to Ground Clearance | 164.7mm 170 mm cranks | 164.7mm 170 mm cranks | 164.7mm 170 mm cranks | 164.7mm 170 mm cranks |
Base Build
S | M | L | XL | |
Wheel Size | 700C/29 in 622 mm BSD | 700C/29 in 622 mm BSD | 700C/29 in 622 mm BSD | 700C/29 in 622 mm BSD |
Tire Width | 2.35in | 2.35in | 2.35in | 2.35in |
Tire Width Max | 2.35in | 2.4mm | 2.4mm | 2.4mm |
Tire Outer Diameter | 741.4mm | 741.4mm | 741.4mm | 741.4mm |
Bike Length with Tires | 1877.4mm | 1902.4mm | 1933.4mm | 1966.4mm |
Stack and Reach vs. Category Trend
Very Upright
Somewhat Upright
Average
Somewhat Aggressive
Very Aggressive
The Bike Insights Upright/Aggressive scale is based on analysis of a bike’s proportions relative to similar sized bikes in the same category.
Learn more about the Upright/Aggressive ScaleCategory Trend
Full-suspension Cross-country MTBSource:https://www.xmcarbonspeed.cc/products/cs-121-mtb-frame