2026 CTM Bikes Koyuk 3.0 Base 520
Build
700C/29 in × 45 mm
Insights
Somewhat aggressive stack and reach vs trend of all-road/gravel bikes
Design deviates from other sizes of CTM Bikes Koyuk 3.0
Stack and Reach vs. Category Trend
View all sizes
Geometry
| Stack | 530mm |
| Reach | 380mm |
| Stack to Reach Ratio | 1.39:1 |
| Seat Tube Length, C-T | 460mm |
| Top Tube Length, Effective/Horizontal HT Top | 531mm |
| Top Tube Slope | 9.8deg |
| Head Tube Angle | 70.5deg |
| Seat Tube Angle | 74deg |
| Head Tube Length | 100mm |
| Bottom Bracket Drop | 76mm |
| Bottom Bracket Height | 280mm |
| Chainstay Length | 430mm |
| Chainstay Length Horizontal | 423.2mm |
| Front-Center | 604mm |
| Front-Center Horizontal | 598.8mm |
| Wheelbase | 1022mm |
| Fork Offset/Rake | 55mm |
| Fork Length (Axle-To-Crown) | 400mm |
| Trail | 67.7mm high |
| Mechanical Trail | 63.8mm |
| Wheel Flop | 21.3mm |
| Tire to Pedal Spindle Distance With 170 mm cranks | 78mm |
| Pedal Spindle to Ground Clearance With 170 mm cranks | 110mm |
Base Build
| Wheel Size | 700C, 29 inch (622mm BSD) |
| Tire Width | 45mm |
| Tire Outer Diameter | 712mm |
| Bike Length with Tires | 1734mm |
| Handlebar Width | 440mm |
| Suspension Type | Rigid, non-suspension corrected |
| Bar Type | Drop Bar |
| Frame Material | Aluminum |
| Fork Material | Carbon/Composite |
| Brake Type | Rim |
Published Sizing Recommendations
| Height | 160 cm to 170 cm |
Source:www.ctm.sk