You can't ride your bike without the chain staying on the chainring, that much is obvious to anyone whether you've been riding for ten minutes or ten years. A good quality chain guide can be used to - as the name suggests - guide the chain into the right place for the ring to catch it and help drive the wheels round.
Whether you're a mountain biker or a road rider, a chain guide is a vital part of your bike that takes up very little space but can have a very big impact. Nobody wants to be thrown over the bars because the chain has come off, or stopping every few minutes to replace it because the rough terrain of your off-road trail keeps displacing it. If you want to keep on riding safe in the knowledge that you've got a reliable chain guide in place then look no further as Tweeks Cycles have all the road and mountain bike chain guides you could possibly need!