2026 BMC Switzerland Fourstroke 01 THREE Base S
Build
700C/29 in × 2.35 in
Insights
Somewhat aggressive stack and reach vs trend of full-suspension cross-country mtb bikes
Stack and Reach vs. Category Trend
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Geometry
| Stack | 584mm |
| Reach | 437mm |
| Stack to Reach Ratio | 1.34:1 |
| Seat Tube Length, C-T | 420mm |
| Top Tube Length, Effective/Horizontal Center | 574mm |
| Top Tube Slope | 18.1deg |
| Head Tube Angle | 66.75deg |
| Seat Tube Angle | 75.6deg |
| Head Tube Length | 84mm |
| Bottom Bracket Drop | 53mm |
| Bottom Bracket Height | 317.7mm |
| Chainstay Length | 432mm |
| Chainstay Length Horizontal | 428.7mm |
| Front-Center | 714mm |
| Front-Center Horizontal | 710.3mm |
| Wheelbase | 1139mm |
| Fork Offset/Rake | 44mm |
| Fork Length (On-Axis) | 513mm |
| Trail | 111.4mm very high |
| Mechanical Trail | 102.3mm |
| Wheel Flop | 40.4mm |
| Standover Height | 725mm |
| Tire to Pedal Spindle Distance With 170 mm cranks | 173.3mm |
| Pedal Spindle to Ground Clearance With 170 mm cranks | 147.7mm |
Base Build
| Wheel Size | 700C, 29 inch (622mm BSD) |
| Tire Width | 2.35in |
| Tire Outer Diameter | 741.4mm |
| Bike Length with Tires | 1880.4mm |
| Handlebar Width | 750mm |
| Stem Length | 50mm |
| Suspension Type | Full suspension |
| Bar Type | Flat Bar |
| Fork Travel | 110mm |
| Rear Travel | 100mm |
| Suspension Sag | Unknown |
| Frame Material | Carbon/Composite |
| Fork Material | Aluminum |
| Brake Type | Disc |
| Features | Single-speed capable |
Published Sizing Recommendations
| Height | 14 ft 4 in to |
Source:https://bmc-switzerland.com/collections/cross-country-mtb-bikes/products/fourstroke-01-three-bikes-bmc-26a-000049#custom_specs_N4gpKw