Originally Posted by
Gramercy
So you make it tighter on the wheel so there's more resistance? I thought the idea was to make as little contact as possible with the trainer because if it's tight the tire can get flat spots. That's what I read on an old thread.
you need to have enough contact pressure to create traction so that it doesn't slip. Read the instruction manual for any trainer you can find and they all say to basically screw the knob in until the drum just makes contact then turn it 2 or 3 more full turns.
Also, mag stuff doesn't just stop working, unless it's literally missing parts. The fact that you can be in your middle ring and that's enough resistance is proof that it's working.