The Tacx T2840 Direct drive blockage-axle makes it possible to mount your bike with disc brakes onto your turbo trainer. The T2840 is suited for a 135x10mm axle skewer attachment.
Do you own a bike with 142 x 12mm or 148 x 12mm axle skewer attachment? Then use the Tacx T2835 Direct Drive blockage axle. The T2835 and T2840 axle are only suited for Tacx Direct Drive turbo trainers. For regular turbo trainers you can find separate axles here.