What problems arise when lubricanting chains?

In order to deal with the difficult and varied conditions of cycling-racing and mountain biking - one of the most imporant an demanding tasks is to optimally maintain and lubricate the chain in order to achieve positive results such as easy gear change and pedalling and a long service life of the chain.First of all, a clean chain is the key prerequisite for ensuring that the lubricant adheres to the chain surface -in order to achieve an optimal wetting of the chain. Secondly, due to the precise fits between the moving parts, an extremely penetrating lubricant is required which reaches all the chain joints, inner bearings, drive bushings and pins in order to lubricate and protect them optimally.