I was going to suggest you check the owner's manual until I checked it
on line and found this useless information:
Adjusting the drive chain or belt tension
The drive chain and belt tension on your Airdyne bike have been
factory adjusted. They should not require any immediate attention.
If they need further adjustment at any point in time, contact your
authorized Schwinn dealer.
Clearly they are not interested in helping you keep you Airdyne in good
condition without buying their service. Sorry I could not be of any help.
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