2025 REI Co-op Cycles ADV 2.1 Base
- Category
- All-road/Gravel
- Design
- Drop Bar, Rigid, non-suspension corrected
- Frame
- Aluminum
- Fork
- Carbon/Composite
- Features
- Disc brake
Geometry
XS | S | M | L | L | XL | |
Stack | 540.5mm | 558.5mm | 579.2mm | 600.1mm | 600.1mm | 621.1mm |
Reach | 365mm | 376mm | 385mm | 394mm | 394mm | 404mm |
Stack to Reach Ratio | 1.48:1 | 1.49:1 | 1.5:1 | 1.52:1 | 1.52:1 | 1.54:1 |
Seat Tube Length, C-T | 385mm | 435mm | 470mm | — | 500mm | 530mm |
Top Tube Length, Effective/Horizontal Center | 519.8mm | 536.1mm | 556.5mm | — | 571.7mm | 587.9mm |
Top Tube Length, Effective/Horizontal Unknown | — | — | — | 571.7mm | — | — |
Top Tube Slope | 19.9deg | 15.8deg | 13.9deg | — | 12.7deg | 11.5deg |
Head Tube Angle | 69.8deg | 71deg | 71.5deg | 71.5deg | 71.5deg | 72deg |
Seat Tube Angle | 74deg | 74deg | 73.5deg | 73.5deg | 73.5deg | 73.5deg |
Head Tube Length | 100mm | 114mm | 138mm | 160mm | 160mm | 180mm |
Bottom Bracket Drop | 71.5mm | 71.5mm | 67.5mm | 67.5mm | 67.5mm | 67.5mm |
Bottom Bracket Height | 284.5mm | 284.5mm | 288.5mm | 288.5mm | 288.5mm | 288.5mm |
Chainstay Length | 438mm | 438mm | 438mm | 438mm | 438mm | 438mm |
Chainstay Length Horizontal | 432.1mm | 432.1mm | 432.8mm | 432.8mm | 432.8mm | 432.8mm |
Front-Center | 595.3mm | 600.7mm | 612.5mm | 628.4mm | 628.4mm | 639.8mm |
Front-Center Horizontal | 591mm | 596.4mm | 608.7mm | 624.7mm | 624.7mm | 636.2mm |
Wheelbase | 1023.1mm | 1028.5mm | 1041.5mm | 1057.5mm | 1057.5mm | 1069mm |
Fork Offset/Rake | 50.1mm | 49.8mm | 49.8mm | 49.8mm | 49.8mm | 49.8mm |
Trail | 77.6mm high | 69.9mm high | 66.6mm high | 66.6mm high | 66.6mm high | 63.3mm mid/neutral |
Mechanical Trail | 72.8mm | 66.1mm | 63.2mm | 63.2mm | 63.2mm | 60.2mm |
Wheel Flop | 25.1mm | 21.5mm | 20mm | 20mm | 20mm | 18.6mm |
Standover Height | 689.5mm | 728.2mm | 758.1mm | 788.1mm | 788.1mm | 814.3mm |
Tire to Pedal Spindle | 69.3mm 170 mm cranks | 74.7mm 170 mm cranks | 86.5mm 170 mm cranks | 102.4mm 170 mm cranks | 102.4mm 170 mm cranks | 113.8mm 170 mm cranks |
Pedal Spindle to Ground Clearance | 114.5mm 170 mm cranks | 114.5mm 170 mm cranks | 118.5mm 170 mm cranks | 118.5mm 170 mm cranks | 118.5mm 170 mm cranks | 118.5mm 170 mm cranks |
Base Build
XS | S | M | L | L | XL | |
Wheel Size | 700C/29 in 622 mm BSD | 700C/29 in 622 mm BSD | 700C/29 in 622 mm BSD | 700C/29 in 622 mm BSD | 700C/29 in 622 mm BSD | 700C/29 in 622 mm BSD |
Tire Width | 45mm | 45mm | 45mm | 45mm | 45mm | 45mm |
Tire Outer Diameter | 712mm | 712mm | 712mm | 712mm | 712mm | 712mm |
Bike Length with Tires | 1735.1mm | 1740.5mm | 1753.5mm | 1769.5mm | 1769.5mm | 1781mm |
Published Sizing Recommendations
Height | 4 ft 2 in to | 4 ft 5 in to | 4 ft 8 in to | — | 4 ft 11 in to | 5 ft 0 in to |
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
All-road/GravelSource:https://www.rei.com/product/207913/co-op-cycles-adv-21-bike