It is the heart of the whole machinery, it works relentlessly to get us to our destination. It turns round and round and round. It does not whine around. It does not question the cyclist and his yet very questionable intents to do some thousands meters of elevation gain. It just keeps going. The chain is probably the most stressed part of the bike. So please take care of it. PROED takes care of your chain in order to turn it into the loyal and especially quiet companion it was supposed to be in the first place. The idyllic silence of the chosen forest trail is the only thing you will hear.