700c Thorn Audax Mk4 Steel Fork - Blue Imron

Mk 4 Audax fork comes in two offsets 46mm and 55 mm.
- Axle to crown - 380mm
The 46mm offset suits all Thorn Audax frames from Mk 2 onwards - except the very smallest size, which used to be Size 495 and is now Size 50cm and the medium sized frame with a short top tube Size 555S (55.5cm). Both these sizes require a 55mm offset.

Thorn 858 seamless Cro-Mo tubing with mudguard bosses for direct and secure fitting of mudguards. These forks are for deep drop 47/57mm caliper brakes.
Clearance for 30mm tyres + guards OR 32mm without guards

55mm for 495s / 555s sizes and the 46mm for all other sizes.