I think most of the trainers that just clamp your rear axle are fine. You might want to use an old QR skewer, but I don't think it damages them. Some trainers had you remove your front tire and clamp your fork to a support (don't see them much anymore). Those tended to cause a lot of stress on the fork and frame, and often led to "indexed steering", because you never (in fact, couldn't!) changed the direction of the handlebars. Regardless, when the bike is mounted in a trainer, you should straddle the frame, then climb on to the pedals keeping your weight centered over the bike, as opposed to clipping in from the side and throwing a leg over.
Most people seem to prefer fluid resistance over mag or wind, because the resistance is more realistic. I've got a Performance TravelTrac Millenium fluid trainer. No great shakes, but I have no complaints.
Last edited by roadbuzz; 10-14-03 at 09:06 PM.