2026 OXFELD Observer gravel Base
- Category
- All-road/Gravel
- Design
- Drop Bar, Rigid, non-suspension corrected
Somewhat upright stack and reachvs category | Somewhat upright stack and reachvs category | Somewhat aggressive stack and reachvs category | Somewhat upright stack and reachvs category | Average stack and reachvs category | Average stack and reachvs category | Average stack and reachvs category | Average stack and reachvs category | Average stack and reachvs category | Average stack and reachvs category | Average stack and reachvs category |
Geometry
S | M | L | XL | XS | XS | XS | S | S | M | L | M | XL | L | XL | m | |
Stack | — | — | — | — | 535mm | 535mm | 518mm | 554mm | 549mm | 567mm | 582mm | 579mm | 600mm | 610mm | 640mm | 579mm |
Reach | — | — | — | — | 355mm | 355mm | 368mm | 366mm | 377mm | 372mm | 378mm | 385mm | 386mm | 394mm | 402mm | 385mm |
Stack to Reach Ratio | — | — | — | — | 1.51:1 | 1.51:1 | 1.41:1 | 1.51:1 | 1.46:1 | 1.52:1 | 1.54:1 | 1.5:1 | 1.55:1 | 1.55:1 | 1.59:1 | 1.5:1 |
Seat Tube Length, Unknown | — | — | — | — | — | 450mm | 432mm | — | 470mm | — | — | 520mm | — | 580mm | 610mm | 520mm |
Seat Tube Length, Effective Unknown | — | — | — | — | 450mm | 500mm | — | 468mm | — | 482mm | 500mm | — | 517mm | — | — | — |
Top Tube Length, Effective/Horizontal HT Top | — | — | — | — | 500mm | — | — | 520mm | — | 534mm | 550mm | — | 564mm | — | — | — |
Top Tube Length, Effective/Horizontal Unknown | — | — | — | — | — | — | 530mm | — | 550mm | — | — | 560mm | — | 570mm | 580mm | 560mm |
Top Tube Slope | — | — | — | — | — | 12deg | 12deg | — | 10.9deg | — | — | 8.6deg | — | 5.6deg | 5.6deg | 8.6deg |
Head Tube Angle | — | — | — | — | 70deg | 70deg | 70deg | 70deg | 71deg | 70.5deg | 71deg | 71deg | 71deg | 71deg | 71deg | — |
Seat Tube Angle | — | — | — | — | 75deg | 75deg | 73.1deg | 74.5deg | 73.1deg | 74deg | 73.5deg | 73.1deg | 73.5deg | 73.1deg | 73.1deg | 73.1deg |
Head Tube Length | — | — | — | — | 115mm | — | 86mm | 135mm | 115mm | 147mm | 159mm | 147mm | 178mm | 180mm | 212mm | 147mm |
Bottom Bracket Height | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Chainstay Length | — | — | — | — | 430mm | 4300mm | 440mm | 430mm | 440mm | 430mm | 430mm | 440mm | 430mm | 440mm | 440mm | 440mm |
Wheelbase | — | — | — | — | 1002mm | 1002mm | 1016mm | 1019mm | 1027mm | 1024mm | 1025mm | 1045mm | 1039mm | 1065mm | 1083mm | 1045mm |
Trail | — — | — — | — — | — — | — — | — — | — — | — — | — — | — — | — — | — — | — — | — — | — — | — — |
Mechanical Trail | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Wheel Flop | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Base Build
S | M | L | XL | XS | XS | XS | S | S | M | L | M | XL | L | XL | m | |
Wheel Size | 700C/29 in 622 mm BSD | 700C/29 in 622 mm BSD | 700C/29 in 622 mm BSD | 28mm BSD 28 mm BSD | 700C/29 in 622 mm BSD | 700C/29 in 622 mm BSD | 28mm BSD 28 mm BSD | 700C/29 in 622 mm BSD | 28mm BSD 28 mm BSD | 700C/29 in 622 mm BSD | 700C/29 in 622 mm BSD | 28mm BSD 28 mm BSD | 700C/29 in 622 mm BSD | 28mm BSD 28 mm BSD | 28mm BSD 28 mm BSD | 700C/29 in 622 mm BSD |
Tire Width | 45mm | 45mm | 45mm | 45mm | 45mm | 45mm | 45mm | 45mm | 45mm | 45mm | 45mm | 45mm | 45mm | 45mm | 45mm | 45mm |
Tire Outer Diameter | 712mm | 712mm | 712mm | 118mm | 712mm | 712mm | 118mm | 712mm | 118mm | 712mm | 712mm | 118mm | 712mm | 118mm | 118mm | 712mm |
Bike Length with Tires | — | — | — | — | 1714mm | 1714mm | 1134mm | 1731mm | 1145mm | 1736mm | 1737mm | 1163mm | 1751mm | 1183mm | 1201mm | 1757mm |
Crank Length | — | — | — | — | — | — | 170mm | — | — | — | — | — | — | — | — | — |
Handlebar Width | — | — | — | — | — | — | 420mm | — | — | — | — | — | — | — | — | — |
Stem Length | — | — | — | — | — | — | 70mm | — | — | — | — | — | — | — | — | — |
Published Sizing Recommendations
Height | 13 ft 4 in to | 14 ft 2 in to | 14 ft 10 in to | 15 ft 6 in to | 12 ft 6 in to | 12 ft 6 in to | 12 ft 6 in to | 13 ft 4 in to | 13 ft 4 in to | 14 ft 2 in to | 14 ft 10 in to | 14 ft 2 in to | 15 ft 6 in to | 14 ft 10 in to | 15 ft 6 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/Gravel