I already have a Velo 7 cyclometer on my hybrid cycle and wanted to install cyclometer on my folding cycle so instead I decided to buy spare sensor set and use the same cyclometer . An excellent cyclometer and sensor , rugged and water proof , takes few mins to install and set up the whole sensor part . Can be used for all size of tyers . The cyclometer is sensitive and accurate (cross checked with GPS) . A cyclometer helps to cycle better as watching your speed and distance helps to plan your training better . A must have and reliable product not to mention BUMSONSADDLE delivery is super fast and you can stay in touch with them on what’s up to clear any doubts regarding any product before buying.