My ribble CGR came with 28mm ultra sport tyres -Ive had these before when having a new bike. Anyway I have a set of not much used GP4000S in 25mm and was going to swap these over. As I took the tube out it seemed quite large and the markings said Valvert 700 35/45 !!!!!! - I postponed the tyre swap !
- Could I use those existing tubes with 25mm tyres
- Are the 25mm tubes I currently carry as spares ok as spares -(get me homes)
- Have ribble stiffed me by putting a 35/45 tube in ?