2026 REI Coop ADV 2.1 Base S
Build
700C/29 in × 45 mm
Insights
Average stack and reach vs trend of all-road/gravel bikes
Stack and Reach vs. Category Trend
View all sizes
Geometry
| Stack | 560mm |
| Reach | 375mm |
| Stack to Reach Ratio | 1.49:1 |
| Seat Tube Length, C-T | 435mm |
| Top Tube Length, Effective/Horizontal Center | 536mm |
| Top Tube Slope | 16deg |
| Head Tube Angle | 71deg |
| Seat Tube Angle | 74deg |
| Head Tube Length | 114mm |
| Chainstay Length | 438mm |
| Wheelbase | 1028mm |
| Fork Offset/Rake | 51mm |
| Trail | 68.6mm high |
| Mechanical Trail | 64.9mm |
| Wheel Flop | 21.1mm |
| Standover Height | 728.2mm |
| Tire to Pedal Spindle Distance With 170 mm cranks | — |
| Pedal Spindle to Ground Clearance With 170 mm cranks | — |
Base Build
| Wheel Size | 700C, 29 inch (622mm BSD) |
| Tire Width | 45mm |
| Tire Outer Diameter | 712mm |
| Bike Length with Tires | 1740mm |
| Suspension Type | Rigid, non-suspension corrected |
| Bar Type | Drop Bar |
| Frame Material | Aluminum |
| Fork Material | Carbon/Composite |
| Brake Type | Disc |
Source:https://www.rei.com/product/254161/co-op-cycles-adv-21-bike