Johnson numbness is something that should NOT go ignored....I suffered from this, it's heavily discussed here http://forums.roadbikereview.com/showthread.php?t=152465holdenJames said:Hey,
When I ride on my rollers after about 20 minutes I seem to go numb in the johnson. I'm assuming its a circulation problem and may have to do with my saddle. Anybody else have this problem? Suggestions?
What he said. If your fit is good on the road, don't start adjusting stuff for rollers. Rollers give a good cardio workout and perfect your balance, but they are at best a poor simulation of the road. If you can't change positions enough to keep from going numb, then just stop every so often, get off the seat for 30 seconds, and then start riding again. In an hour roller ride, I probably do this 3 to 4 times, as standing for any period of time difficult.ZoSoSwiM said:Even if your bike is in perfect adjustment for your body you'll get different feelings riding on rollers and a trainer. On the road I never have a problem.. On rollers I go numb after 30 minutes.
I can stand and ride no handed on them and try to vary my position as much as possible. Sadly I still can't change it up enough to simulate the road.