Silicone
A good friend of mine was once on the Australian International Six Day Enduro Team. Whilst training at the Australian Institute of Sport apart from fitness training they also do bike repairs and maintainance. They were told never use WD40 or simliar on your chain. It gets into the inside of the chain and waters down the chains internal lubricant. Its a drying agent not a lube as such. After cleaning the bike they were advised to spray the chain with a silicone based lube. After that they never lube at all. They have proven that all lubing or oiling your chain does is dirty your bike and make it harder to clean. It flicks off in the first kilometre and as stated above you are really only lubricating the contact between the chain and sprocket. The O Rings make it nearly impossible for thick lube to penetrate into the chain rollers. Correct adjustment is the key to stop snatching and pulling at the sprocket teeth. Thats just what I was told so take out of it what you will. Thanks.
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