Catching his breath alongside a road near Seattle, WA USA
1999 K2 OzM, 2001 Aegis Aro Svelte
I have been looking into this myself. My current computer is wireless and doesn't have the range to allow me to use the sensor with the rear wheel. I also have a Minoura Rim-Drive trainer. The magic in the Minoura Hyper-Brain is not the computer itself as you have already guessed but the mounting bracket that attaches the sensor to the trainer. The magnet and pickup is still done via the rear wheel. If it were up to me and I had to choose between the Astrale and the Hyper-Brain, I'd pick the Astrale and mount the sensor on the rear chainstay. This way I could use the computer with the bike wether or not it was on the trainer. To be honest, I was considering doing some tinkering to mount an additional sensor in a similar manner as the Hyper-Brain (on the flywheel assembly) and either boosting the signal or relaying the magnetic pulse via a wired relay to my front fork mounted wheel sensor.