Sorry if this question has been asked before which I am sure it has. Just inquiring about the accuracy of my rear wheel speed while on the trainer. Im using the CycleOps Magneto. Speed seems really low for the power im displacing. Thanks
Heh.....one thing I noticed when transitioning from riding outside to riding on a trainer (I have the Fluid 2, which has more resistance than the Magneto), is "Holy crap, it's harder maintaining x amount of speed for y amount of time". To me, it sorta felt like I was continually riding up a slight hill.....but, after I became accustomed to this, and in better shape, my speed increased. I'm actually faster outdoors than indoors.....although I did hit my new "average speed" indoor record of 18 mph for nearly 2 hours the other week. My previous best was 17.5 mph for 3 hours. Yeah, I have no life.
But...your cyclocomputer settings are based on your wheelsize, which you punch in when you first set up your computer, so a trainer will have no effect on producing a lower/higher number than you would riding outdoors.
Consider that while on a trainer the bike has no momentum. As soon as you stop pedaling on a trainer the rear wheel loses speed and comes to a complete halt much sooner than while riding outdoors. I agree with the above statement that it is harder to sustain speed for a set amount of time on a trainer than riding outdoors. For the record i dont know if stating that the fluid trainer has more resistance than the magneto. From what i have read the difference is the smoothness of the resisitance and the range of resistance. If your maintaining 18mph I have some work to do.
If you go to the CycleOps site and compare the trainers, you'll see that the Fluid 2 actually has more resistance built into it. However, looking at the charts, you're riding with more resistance at a lower speed than I am on the Fluid 2.....BUT, looking at another chart I posted up in another thread on a Fluid 2 with actual watts vs. gear/cadence combos, the two charts seem to differ. So....who really knows.