Bikes / Mason / Definition
Mason Definition 2026 Geometry, Reviews, and Specs
Fit and steering
Aggressive fitSlow steeringFast steeringRelaxed fit Mason Definition 2026 Sizing Guide
Mason Definition 2026 Geometry Chart
| Size | Stack | Reach | Stack/reach | Stem | Bar | Crank | Head tube angle | Seat tube angle | Chainstay | Wheelbase | BB drop | Wheel size |
|---|
| 48 | 530 mm | 367 mm | 1.44:1 | 80 mm | 380 mm | 165 mm | 71.0° | 74.5° | 422 mm | 998 mm | 74 mm | 700c |
| 51 | 548 mm | 373 mm | 1.47:1 | 90 mm | 400 mm | 170 mm | 71.5° | 74.0° | 422 mm | 1006 mm | 74 mm | 700c |
| 54 | 566 mm | 379 mm | 1.49:1 | 100 mm | 420 mm | 172.5 mm | 72.0° | 73.5° | 422 mm | 1014 mm | 72 mm | 700c |
| 56 | 584 mm | 385 mm | 1.52:1 | 100 mm | 420 mm | 172.5 mm | 72.5° | 73.0° | 422 mm | 1024 mm | 72 mm | 700c |
| 58 | 602 mm |
2026 colorways
No colorway catalog for 2026 yet.
What changed in the bike frame
Same published geometry as 2025.
- Published geometry matches the 2025 Mason Definition. Same sizes, same stack and reach.
What changed in equipment
No verified spec sheet for 2026 or 2025.
What changed in price
No launch MSRP in the catalog yet.
- My setup for the Transcontinental Race: Mason Definition bike check ... MASON RESOLUTION Review — Is It WORTH the Price? nikinik•4.2K views.
Compare 2026 and 2025 Mason Definition side by side
