We lean on Black Diamond Additive when we want a hot-wax setup that punches well above the usual paraffin routine. Rex takes the same additive package from its Black Diamond drip lube and casts it into a solid block in Hartola, which gives us a precise, lab-made dose of the friction modifiers we trust. It feels like dropping a bottle of their race lube straight into the wax pot.

What we’ve found is that pairing one black block with four white blocks creates a mix that runs impressively quiet and holds its speed deep into bad conditions. The treatment lasts longer than standard blends and keeps the chain cleaner, which matters on the long rides where a drivetrain usually starts to drag. When we want the lowest friction setup with real durability, this is the additive we reach for.