A full groupset will include the gear shifters, derailleurs, chainset, brakes, cassette, bottom bracket, chain and cables. You may benefit from investing in a new groupset if you are building your frame from scratch. Buying a full groupset may also appeal as the parts are designed work perfectly in unison. There are different groupsets designed for the various disciplines; a mountain bike groupset will differ from a road bike groupset. If you’re hoping to improve performance, or you’ve simply noticed that multiple parts are beginning to wear at the same time, buying a groupset may be your best option.