What are the alternatives to SwissStop Blue v-brake pads We've got a tandem with Rigida Andara CSS tungsten carbide rims and Swisstop Blue v-brake pads. We're happy with the performance and life of both of these over the last 1000 miles. The problem is that _only_ Swisstop Blue blocks are recommended. I've been led to believe that other blocks will wear out too quickly on tungsten carbide rims, possibly leaving a rubbery deposit on the rims. I'd like to know of more than one manufacturer or supplier (preferably in the UK) who can provide suitable replacement v-brake block cartridges, so that I have options if the Swisstop ones are unavailable or become expensive. I don't like being tied to a single brand for what should hopefully be quite long-lived rims. Are there any reasonable alternatives?

Kool stop R9 Magura HS33 Pads are made to work with Rigida CSS rims.

Also V-Brake inserts by kool stop for Rigida CSS rims.