Framesets
Surly Lowside Frameset - Blue Monday
Medium
Package contents
Included Components
- Surly Surly Lowside · Included with Medium
Compatibility: reviewed
Known specifications can be used by the compatibility engine.
Retailer offers
Where to Buy
Compare verified retailer affiliate links or search Amazon. We may earn a commission from qualifying purchases. Please confirm the exact variant before purchasing.
Catalog trust
Evidence and freshness
Technical-source dates and retailer offer checks are separate. A retailer check does not validate compatibility.
Report a correction- Technical review
- Aug 17, 2026
- Compatibility review
- Reviewed Aug 17, 2026
Approved technical sources
- Surly official bbShell for FM1353ManufacturerSource checked Aug 15, 2026Evidence reviewed Aug 15, 2026
Technical data
Specifications
- Supported wheel diameters
- ISO 559 (26″)
- Supported rear axles
- 12x142, 12x148
- Supported build types
- Single Speed
- Bottom bracket shell
- BSA-73
- Maximum tire width
- 71.12 mm
- Seatpost diameter
- 30.9 mm
- Brake mount
- IS Mount
- Maximum chainring
- 36T
- Seat tube length
- 416 mm
- Effective top tube
- 610 mm
- Head tube length
- 140 mm
- Bottom bracket drop
- 55 mm
- Head tube angle
- 70°
- Seat tube angle
- 74°
- Wheelbase
- 1110 mm
- Chainstay length
- 425 mm
- Standover height
- 762 mm
- Stack
- 574.4 mm
- Reach
- 445.3 mm