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2024 MASH AC-4 Frameset in Neon Orange Green continues the AC series with Columbus 7005 aluminum tubing, carbon fork, aggressive road geometry and clearance for up to 700×32c tires. Built for fast fixed gear riding.
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The 2024 MASH AC-4 Frameset in Neon Orange Green comes from San Francisco-based MASH SF and continues the spirit of the brand’s popular AC series. It is built around aggressive road geometry, fast street riding and a direct fixed gear feel.
The frame is made from Columbus 7005 series aircraft aluminum tubing and paired with a carbon fork, creating a strong balance of stiffness, weight and handling response. The AC-4 keeps the sharp riding character of the AC line, while the updated fork mold provides increased tire clearance for up to 700×32c tires front and rear.
The frameset uses a 1-1/8" to 1-1/2" tapered headset system for improved front-end stiffness and stable handling. Rear spacing is 120mm for fixed gear wheelsets, front spacing is 100mm, bottom bracket standard is 68mm JIS and seatpost diameter is 27.2mm.
Each frameset includes the frame, matching fork, Zero Stack sealed headset, seat clamp, compression plug and top cap. The frame and fork can be drilled to support front and rear caliper brakes. The fork is molded with a brake bridge, keeping a clean brakeless look while allowing brake compatibility when needed.
The Neon Orange Green finish delivers a bold MASH street look with strong visibility and speed-focused energy. It is a standout choice for riders building a fixed gear, track-inspired or fast street bike with a high-impact visual style.
Specifications
Brand: MASH SF
Product Name: 2024 MASH AC-4 Frameset
Color: Neon Orange Green
Frame Material: Columbus 7005 series aircraft aluminum tubing
Fork Material: Carbon fiber
Seatpost Diameter: Ø27.2mm
Front Spacing: 100mm
Rear Spacing: 120mm
Headset Standard: 1-1/8" - 1-1/2" tapered
Bottom Bracket: 68mm JIS
Maximum Tire Clearance: Front and rear 700×32c
Brake Compatibility: Frame and fork can be drilled for front and rear caliper brakes
Use: Fixed Gear / Track Bike / Street Riding
Frameset Includes
Frame
Matching fork
Zero Stack sealed headset
Seat clamp
Compression plug
Top cap