Pro-Form Studio Bike Pro 22 User Manual page 29

HOW TO ADJUST THE DRIVE BELT
If the pedals slip while you are pedaling, even when
the resistance is adjusted to the highest level, the drive
belt may need to be adjusted.
To adjust the drive belt, first unplug the power
adapter. Next, locate the Idler Cover (36). Remove the
M4 x 16mm Flange Screw (87) and the Idler Cover.
87
36
65
29
Then, tighten the M10 x 50mm Screw (65) until the
Drive Belt (not shown) is tight.
When the Drive Belt (not shown) is tight, reattach the
Idler Cover (36) and plug in the power adapter.