Ventura Power Sets are a great way to save money by purchasing your cassette and chain together. Generally if you haven't swapped the chain in years and the bike skips when you put load on the pedal, theres a good chance both chain and cassette are worn.
 
A cheaper alternative to costly OEM brand name parts the Ventura brand is quality german made and compatible with Shimano. 
 
Chain and cassettes can be installed by Cairney Cycles using the fit for me option. Connor will be in contact to arrange your fitting, if you have any queries get in touch.