2025 CTM Bikes Zephyr Base
- Category
- Hardtail Trail MTB
- Design
- Flat Bar, Hardtail (Front suspension)
- Suspension
- 120mm fork travel
- Features
- Disc brake
Average stack and reachvs category Suspension sag unknown Geometry may mis-represent actual riding geometry | Average stack and reachvs category Suspension sag unknown Geometry may mis-represent actual riding geometry | Average stack and reachvs category Suspension sag unknown Geometry may mis-represent actual riding geometry |
Geometry
M | L | XL | |
Stack | 616mm | 630mm | 635mm |
Reach | 420mm | 445mm | 470mm |
Stack to Reach Ratio | 1.47:1 | 1.42:1 | 1.35:1 |
Seat Tube Length, C-T | 440mm | 480mm | 520mm |
Top Tube Length, Effective/Horizontal Center | 577mm | 606mm | 633mm |
Top Tube Slope | 19.6deg | 16.3deg | 12.6deg |
Head Tube Angle | 66deg | 66deg | 66deg |
Seat Tube Angle | 72deg | 72deg | 72deg |
Head Tube Length | 95mm | 110mm | 115mm |
Bottom Bracket Drop | 50mm | 50mm | 50mm |
Bottom Bracket Height | 322mm | 322mm | 322mm |
Chainstay Length | 435mm | 435mm | 435mm |
Chainstay Length Horizontal | 432.1mm | 432.1mm | 432.1mm |
Front-Center | 729.6mm | 760.5mm | 787.5mm |
Front-Center Horizontal | 727.9mm | 758.9mm | 785.9mm |
Wheelbase | 1160mm | 1191mm | 1218mm |
Fork Offset/Rake | 51mm | 51mm | 51mm |
Fork Length (On-Axis) | 545mm | 545mm | 545mm |
Trail | 109.8mm very high | 109.8mm very high | 109.8mm very high |
Mechanical Trail | 100.3mm | 100.3mm | 100.3mm |
Wheel Flop | 40.8mm | 40.8mm | 40.8mm |
Tire to Pedal Spindle | 187.6mm 170 mm cranks | 218.6mm 170 mm cranks | 245.5mm 170 mm cranks |
Pedal Spindle to Ground Clearance | 152mm 170 mm cranks | 152mm 170 mm cranks | 152mm 170 mm cranks |
Base Build
M | L | XL | |
Wheel Size | 700C/29 in 622 mm BSD | 700C/29 in 622 mm BSD | 700C/29 in 622 mm BSD |
Tire Width | 2.4in | 2.4in | 2.4in |
Tire Outer Diameter | 743.9mm | 743.9mm | 743.9mm |
Bike Length with Tires | 1903.9mm | 1934.9mm | 1961.9mm |
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
Hardtail Trail MTBSource:https://www.ctm.sk/cz/p/zephyr-29-2025