Sunday, December 31, 2006

Cycle-Ops Fluid Trainer How to - screeching sound fix

So for a while my Cycle-Ops fluid trainer has been emitting a horrendous screeching sound. I occasionally tighten the end nut holding on the flywheel:
and it seems to help but today I decided to take a closer look at the situation.

Armed with my trusty LED headlight as a flashlight (it's in that picture just under my hand), I took the flywheel off and actually studied it, instead of just wiping it off and putting it back on.

What I found is that there was probably a spacer missing from the trainer, one that would sit between the flywheel and the plastic stuff holding the roller bearing in place. Since that plastic was made with the "harder than aluminum" Campy Ergo cable housing stuff, it actually ground away at the flywheel:
(note the inside of the flywheel - the dark bits on the thin reinforcing walls coming out from the center are where the matte silver finish was ground off).

I checked the flywheel and the damage wasn't bad. I checked the plastic bits and they were untouched. I walked around my cluttered bike room with the flywheel, trying to find a washer or spacer that would sit properly against the cartridge bearing center but not rub the dustcap. I found that the roller shaft was the same diameter as a rear axle. So I grabbed a rear axle spacer (painted yellow from back in the day of having too much time to fiddle with my bike) and put it on:

slipped the flywheel back on, and tightened everything up.

Presto! Smooth flywheel! And quietness.

I celebrated by riding for an hour and a half while watching Floyd in all sorts of trouble that day in the mountains.

1 comment:

EZ said...

Thanks, this is a great tip!