Bought from STW and never used by me. All I can recall about it is that it is compatible with disc braked bikes and mtb tyres.

in good condition, dusty from being stored in the garage.

price £50 posted to UK postcode

some blurb from the CRC page:

Minoura E-RDA 80 Rim Drive Trainer

For use with Off-Road tires – The RDA system (Rim Drive Action) is Minoura’s patented trainer system that drives the resistance unit via rubber rollers to the rim side wall, not the tire itself.

Because there is no tire contact, there is no tire wear/noise or vibrations caused by the tire tread pattern. This means MTB riders do not have to change tires or have a 2nd bike to do indoor training, just put your MTB bike on and off you go. For the serious MTB racers it means you can warm up before a race, on your actual race bike set-up, just like road racers. That means less gear to take and easier for you to get ready for a race.

The RDA system (Rim Drive Action) is Minoura’s patented trainer system that drives the resistance unit via rubber rollers to the rim side wall, not the tire itself. Because there is no tire contact, there is no tire wear/noise or vibrations caused by the tire tread pattern. This means MTB riders do not have to change tires or have a 2nd bike to do indoor training, just put your MTB bike on and off you go. For the serious MTB racers it means you can warm up before a race, on your actual race bike set-up, just like road racers. That means less gear to take and easier for you to get ready for a race.

Road bikes and RDA trainers – There is one very good reason why road racers should use the RDA trainers. If you use the RDA for warming-up and cooling-down at a race event, you do not have to worry about wearing out your expensive racing tires. That makes the RDA ideal for competitive road racers.

The RDA Magnetic Resistance Unit – The RDA unit was regulated at a medium 365 Watts of power. This is because a larger resistance would require a much stronger roller pressure at the rim end, which would cause much increased wear of the roller/rim. There are 7 levels of resistance, controlled via the Remote or Dial lever. There is also an accurately 800 gram spin-balanced flywheel, to assist with a very smooth rotation at all times.