This is a 110/50-6.5 slick tread (racing on-road) tire. Commonly used as (but not limited to) rear and front tires for various pocket bike and mini street racing machine setups. Is a direct replacement for most 2-stroke pocket bikes rear tires and a large percentage of front tires. Market trends are such that the vast majority of pocket bike tire configurations are either 110/50-6.5 in both the front and rear or they are 110/50-6.5 in the rear and 90/65-6.5 in the front.