Chain lube might be costing you more watts than you think. This episode dives deep into drivetrain efficiency with Josh, exploring why most commercial lubes are environmental disasters, how wax-based systems actually work, and the specific gearing choices that'll make you faster on both road and gravel bikes.
Key Takeaways
- Dry lubes are garbage — they're only 10% lubricant and 90% carrier solvent that evaporates instantly. Oil-based wet lubes work better but pull dirt into the chain as you ride. Wax-based drip-on systems (like ceramic speed UFO or super secret products) deliver 75% of hot-wax performance without needing to strip and re-dip your chain.
- Wax chains need a drop per roller, should dry overnight, then get a light reapplication after your first two rides. After that, reapply every 200-300km. Never use solvents again — just pour boiling water over the chain to clean, then re-wax.
- Smaller cogs cost you watts: going from an 11 to a 10-tooth cog costs ~2 watts, and a 9-tooth costs ~3 watts more. Offset this by running larger chainrings up front (roughly 0.5 watts per 3 teeth), and avoid one-by setups for racing due to excessive cross-chaining losses.
- Tire width matters less than rim compatibility: for road racing, aim for the rim to be 105% of the tire width (caliper both to verify). On gravel, wider is better — every 5mm wider tire gains 2 watts of aero drag but 10+ watts of real-world rolling advantage on rough surfaces.
- Testing bias is everywhere in the industry. Companies aren't always lying; they're designing products to win on their specific test machine, wind tunnel, or lab setup. This doesn't mean the product is fast in the real world.
- A poor chain lube choice can cost you 4–5 times more watts than upgrading to an oversized pulley system. Focus on lubricant efficiency first; it's the best watts-per-dollar upgrade available.
Expert Quotes
"Dry lube as a category is absolute garbage and you should never even consider buying it. Beyond garbage, they're all little environmental hand grenades — most are toxic cancer-causing PFAS chemicals on their way to being banned."
"You can't have a chain that wears out in a thousand kilometers and have that be a fast chain lube because the chain is wearing out because metal is scraping against metal. There's no way in hell that can be fast."
"At 500 watts you don't double the watt loss from a dry lube — a White Lightning product might be 11 or 12 watts of loss on 250 watts input. Those are brutal numbers. A hot melt wax probably buys you half an oversized pulley system's worth of savings compared to alternatives."