I'm sure there's a quick-link address, but off the top of my head:

www.aircanada.com
>site map
>at the airport
>checked baggage
>sports equipment
>bicycles

Charges and conditions of carriage should be itemized. Believe that the bicycle can count as one piece of your baggage allowance. Should it exceed weight restrictions, excess baggage fees apply. In the past, special services has provided heavy weight bicycle packing bags.