Choosing a Chain Wax
Silca Hot Melt, Molten Speed Wax, and REX Black are three of the most respected immersive chain‑wax systems, but they excel in different performance niches. Below is a clear, structured comparison to help you understand how they differ in friction, durability, additives, and ideal use cases.
🥇 At A Glance
- Silca Hot Melt — Best for maximum speed thanks to WS₂ nano‑modifiers; extremely clean and race‑focused.
- Molten Speed Wax — Best for simplicity and consistent all‑round performance; very fast and very clean.
- REX Black — Best for extreme longevity and wet‑weather durability; tunable formula with exceptional lifespan.
Performance Comparison
Friction & Speed
- Silca Hot Melt
Uses tungsten disulfide (WS₂) nano‑particles, one of the lowest‑friction solid lubricants. Produces a very fast, quiet drivetrain ideal for racing
- Molten Speed Wax
Uses PTFE + molybdenum disulfide additives. Known for extremely low friction and widely used in time‑trial and triathlon communities
- REX Black
Uses REX’s Black Diamond additive (solid version of their top drip lube). Independent testing shows it can outperform many waxes in both speed and longevity
Fastest in pure friction: Silca (due to WS₂ nano‑scale bonding)
Most consistent across conditions: REX Black
Longevity
- Silca Hot Melt
Typically lasts hundreds of kilometres per treatment; excellent in dry and mixed conditions
- Molten Speed Wax
Usually 300–500 km per dip in dry conditions
- REX Black
Known for exceptional longevity — depending on blend, riders can achieve up to 1100–1400 km between rewaxing
Longest lasting: REX Black by a large margin
Additive Technology
- Silca Hot Melt
WS₂ nano‑particles embed into metal surfaces for ultra‑low friction
- Molten Speed Wax
PTFE + MoSâ‚‚ blend for slickness and wear reduction
- REX Black
Customizable paraffin + Black Diamond additive block; tunable for wet or dry conditions
Most advanced friction modifier: Silca (WSâ‚‚)
Most customizable: REX Black
Cleanliness & Contamination Resistance
- Silca Hot Melt
Very clean, dry, and dust‑resistant
- Molten Speed Wax
One of the cleanest waxes available; drivetrain stays spotless
- REX Black
Excellent dirt repellency, especially in wet conditions
Cleanest overall: Molten Speed Wax (slightly cleaner than Silca in some conditions)
Best in wet grit: REX Black
Summary
🎯 Final Recommendation
If you want maximum speed and race‑day performance, choose Silca Hot Melt.
If you want clean, simple, reliable waxing, choose Molten Speed Wax.
If you want the longest‑lasting and best wet‑weather wax, choose REX Black.