Precision fit for track bikes Designed for 1/8 inch chain systems, this fixed gear cog and lock ring pair fits most track hubs in the UK market, ensuring reliable compatibility for smooth and secure riding on fixed gear or singlespeed bicycles. Long lasting steel construction Made from robust steel, the cog and lock ring resist wear and tear, delivering extended performance under demanding riding conditions while maintaining consistent power transfer. Versatile tooth options Available in 13T, 14T, and 18T sizes, with orthodontic teeth on the 34.8mm flywheel and reverse teeth on the 32.8mm lock ring, providing flexible gearing choices to suit various terrain and speed preferences. Secure locking mechanism The reversethreaded lock ring firmly fastens the cog to the hub, preventing accidental loosening during backpedaling or sudden stops, enhancing rider safety and control. Use scenarios Track training or fixedgear rides: select 13T for quicker acceleration and tighter cadence in shortcourse efforts, or 14T for a balance between acceleration and speed; 18T suits higherspeed flat sections. Urban commuting with variable terrain: choose gearing to match hills and stops, while the secure lock ring helps maintain position during frequent backpedaling and quick stops. Recreational rides with mixed terrain: 13T or 14T for climbs and cadences on rolling terrain, 18T for sustained speed on flatter stretches, all with reliable trackhub compatibility.