Rock N Roll Gold Low Vapour Lube 4oz It's the latest addition to Rock N' Roll that does both road and mountain bikes. It costs a little more, but keeps it simple with one lube. The formulation goes deep down into the chain and traps any dirt. Then, with the energy of the chain freewheeling backwards, the dirt and grit floats to the surface so you can wipe it all off, leaving a new and clean application of lube inside the chain, where it's needed. The lube down inside the chain creates a protective membrane to seal out dirt and moisture from the moving parts of the chain. As well as holding in place the best lube on the planet, for longer chain life, super smooth shifting and pedaling. Bicycles, being on rubber tires, are not grounded, making the bicycle a static electricity machine. As the bicycle rolls along, positive charge build up will bring dirt and dust particles from the road onto the bike. The bike will discharge and do it all over again, bring up more dirt. Ever wonder why you have a perfect dust line on the front of your fork blades or on the cable housings. That's how the bike gets dirty on the road, on dry days. The dirt is also going to stick to whatever is sticky on the bike. Of course, the chain is the number one spot. Road bikes generally tend to pick up more dirt from the discharge, so a thicker, dryer membrane is needed. On the other hand, the mountain bike needs something that can take lots of dust, and/or muddy slop being kicked up on the chain from the front wheel. With water crossing, too!