Mr Pig said:
From the KMC page:
Yes of course they do. They remove 'everything' from the chain's bearings. That's the point I thought.
Then when you re-lubricate the chain you put nice clean new lube in there. The rollers on the chain arn't a sealed system, a lot of crap gets in there, and it makes no sense to me to just leave it in there and keep throwing oil at the outside.
I've cleaned my chain this way for years and it's nice and quiet and smooth when it's clean and has a nice new coating of Finnish line Cross Country. If I'm lazy and just wipe the outside and throw oil on the chain it is better but nowhere near as good as a full wash up. I don't agree with the KMC advice.
I agree.
My preferred method is to blast the chain with compressed air. Its not an option for most people of course, but whatever method you use to get the crud out from as much of the inside of the chain HAS to benefit more than simply wiping the chain...no-one could argue otherwise.
Whether you can be bothered to, or have the equipment or cleaner to do it is another matter.
It's not REALLY neccessary to do it with solvents, compressed air etc etc...but if done properly, (as Mr Pig says, by drying the solvent cleaned chain in an oven, to get rid of all the traces of solvent that would otherwise immedaitely start attacking the new oil)...the benefits are undeniable.
A chain with grinding crud in the rollers and links...or no grinding crud...what would you choose ?
It's about having the time, equipment and the will to do it. No big deal if you havnt the time etc..your chain isnt going to fall apart, but like everything...you can do an acceptable job..or a good job.