Now you are able to be in easier gears on the hills.
These are made by the major manufacturers, Campagnolo, Shimano & Sram, who make theirs compatible with Campag & Shimano.
The cassette on a road bike is made up of individual rings and the whole thing sits on a freehub which provides the free wheel when you’re coasting downhill etc.
The manufacturers are now making bigger & bigger cassette rings. Hope have just released a 40 tooth ring which sits behind your existing cassette & replaces one of your middle rings. This is potentially a great idea because it would mean that you do not have to change your existing crank set for a triple or compact. Gives you climbing ability without costing a fortune.
If you have the tool to unlock your cassette lock ring then it makes changing & cleaning really easy as you can remove it in only a few minutes.
This video shows you how: http://youtu.be/bYejbxf2epM
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