The valve is 60mm long and is a Presta style. The inner core is removable. Continental Race 28 Tubes (700c x 20-25c) with 60mm Presta Valves x2. 700 x 20c to 700 x 25c. 27 x 3/4 to 27 x 1.00. We will endeavour to turn an unhappy experience into a positive one.