Avon – Avon Spirit ST, including front fitments such as 110/70ZR17, 120/70ZR17, 120/60ZR17, 110/80ZR18, 120/70ZR18, 100/90ZR18, 110/80R19 and 120/70ZR19, with rear sizes spanning 150/60ZR17, 150/70ZR17, 160/60ZR17, 160/70ZR17, 170/60ZR17, 180/55ZR17, 190/50ZR17, 190/55ZR17 and 160/60ZR18. The Spirit ST is the sport-touring specialist of the range, built for riders who want sportbike-grade cornering response but expect to cover serious distance between tire changes. A dual-compound layout puts harder rubber in the centre for long highway mileage and softer material on the shoulders for confident lean-angle grip. Siping and groove placement are tuned for wet-weather traction, which matters on an all-season commute or a tour that runs into weather. W-rated construction keeps things stable when a bike is loaded with luggage and a pillion. Across adventure-touring 19 in. front fitments and 17 in. sport chassis alike, these Avon tires deliver steady, neutral steering and quiet manners. Front and rear sizes are listed together so a full set can be matched by section width and rim diameter, from a 17 in. sport-tourer to a 19 in. adventure machine.