Setting out, as we do, on a fresh drivetrain, the 2,000-mile trip seemed like a fine place to evaluate the merits of a new chain lube. I think, generally, the trip lived up to expectations. We rode for twenty-eight straight, back-to-back days in a coastal climate. The route had plenty of sand, fog, and salty sea air, and not too much in the way of drenching rain. It also featured endless short, steep climbs which, on a fully-loaded touring bike, guaranteed that the chain led about as stressful a life as a road-bike chain will experience.
To spoil all narrative suspense: this stuff is fantastic.
The thing I look for most in a lube is durability; the more miles I can ride between reapplications the happier I am. This is doubly, or perhaps 2.5 times, as important to me when I'm touring and have other things on my mind. I also prefer that my lubricants not leave a lot of build up on my running gear, as a trapping a bunch of grit against the moving parts of the drivetrain seems to defeat the purpose to me. The Dumonde excelled in both categories.
In terms of durability, I was regularly clocking 300+ miles between applications. Dumonde advises that one "Re-apply Dumonde Tech G-10 Bio-Green only when you begin to hear your chain; sound, not appearance or time, is the best indicator of when the chain needs a reapplication of G-10 Bio-Green." About halfway though the tour, I thought I might be able to harvest a blog post from my endeavors, so I put the sound thing to the test. That time, there were 733 miles between the applications. But I'm not abusive to my gear, so I stuck to reapplying somewhere between 300 and 400 miles, regardless of sound. I'm quite happy with that.
In terms of cleanliness, the Dumonde kept things fairly tidy. There was no thick black gunk clogging my pulleys or flaking off of my chainrings. Granted, the chain wasn't particularly sparkling, but I can't see caring about that. That's the sign of a bike that rules the garage--I always prefer my gear to bear some marks of exertion. Aside from the condition of the drivetrain, though, was the ease with which I could reverse it. After getting back to my shop, I took a toothbrush and some dishwashing soap to the cassette and had it sparkling inside of five minutes. Compared to the usual routine of degreasers and mineral spirits and soaking and scrubbing, cleaning the Dumonde-treated equipment was a revelation.
At the end of the tour, the chain was worn exactly as much as I expect a chain to wear after 2,000 miles under Clydesdale with a touring load. No more and no less, which is about all I expect from a lube. Taking the soap-and-water cleaning routine and the long reapplication interval, I'm perfectly comfortable recommending Dumonde G-10 to others. So go ahead, give it a shot.
- There are, of course, some ancillary issues that bear comment. The biggest, perhaps, is that "G-10 Bio-Green" designation. This is Dumonde's contribution to the steadily-growing tide of "green," "natural," and/or "biodegradeable" lubricants and solvents in the cycling world. I'm a tree-hugger, sure, but I don't really care about this. First, the Dumonde formula is totally proprietary, so there's no way to evaluate how green it actually is. It still carries a hell of a poison warning on it, so it's not like you're buying something that's as natural as pouring olive oil on your chain. Secondly, I already do all of my commuting and a lot of my general errand running by bicycle instead of car or bus. I therefore resent the attempt to make me guilty or anxious about the four ounces of oil it take me per year to accomplish those tasks.
- Around the internet, the traditional Dumonde lubes have something of a reputation for terrible smells. The G-10 formulation gets somewhat more favorable reviews, but I would not recommend using it as cologne. Nevertheless, why are you sniffing your chain? Why would that factor into any evaluation of mechanical equipment?
- Dumonde recommends completely stripping down and cleaning your drive train before the first application of any of their lubes. If you're used to just running chains fresh from their boxes, this is an important step to be aware of.