2026 Curtis Slackjack Base S
Build
700C/29 in × 50 mm
Insights
Somewhat upright stack and reach vs trend of progressive gravel bikes
Stack and Reach vs. Category Trend
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Geometry
| Stack | 562mm |
| Reach | 390mm |
| Stack to Reach Ratio | 1.44:1 |
| Seat Tube Length, C-T | 470mm |
| Top Tube Slope | 12deg |
| Head Tube Angle | 68deg |
| Seat Tube Angle | 74deg |
| Head Tube Length | 120mm |
| Bottom Bracket Drop | 70mm |
| Bottom Bracket Height | 291mm |
| Chainstay Length | 435mm |
| Chainstay Length Horizontal | 429.3mm |
| Front-Center | 641.2mm |
| Front-Center Horizontal | 637.3mm |
| Wheelbase | 1066.7mm |
| Fork Offset/Rake | 45mm |
| Trail | 97.3mm very high |
| Mechanical Trail | 90.2mm |
| Wheel Flop | 33.8mm |
| Tire to Pedal Spindle Distance With 170 mm cranks | 110.2mm |
| Pedal Spindle to Ground Clearance With 170 mm cranks | 121mm |
Base Build
| Wheel Size | 700C, 29 inch (622mm BSD) |
| Tire Width | 50mm |
| Tire Outer Diameter | 722mm |
| Bike Length with Tires | 1788.7mm |
| Suspension Type | Rigid, non-suspension corrected |
| Bar Type | Drop Bar |
| Frame Material | Steel |
| Fork Material | Unknown |
| Brake Type | Disc |
Source:curtisbikes.co.uk