dont really know what they are called,a racermate, a wind trainer ,a turbo trainer. all i do is buy a tripod to hook my bike up on so when its 0 outside or its icy outside ican ride indoors on my regular bike. 100 bucks. nothing fancy. now, reading online, i seen a few posts saying 60 minutes on a trainer is like 90 minutes outside?????? where do they come up with this info? as a rider/racer these last 20+ years i know the feeling of what gear i'm in. outside if i'm just spinning i may be in a 53x 19. on the trainer, i may be in a 53x21 but the feeling in my legs is the same because of the tension on the trainer. bottom line is when i ride outside, i'm going on a flat 5 mile circut with no stops, peddal the full 3-4 hours nostop. no signs no rr tracks no lights to stop, no hills to coast down. when i ride inside on the trainer its peddal till the workout is over. where do the coaches and other people that post say 60 minutes on the trainer is like 90 outside?? makes no sense..