Originally Posted by
dabac
Strong in everyday terms is too fuzzy when you get down to detailed engineering questions. Since your spokes held up in the beginning the issue you're dealing with is fatigue - not "strength". When it comes to pure pulling power spokes are just about always more than strong enough. Nipples and rims tends to fail way before the spoke is torn apart.
Agreed. Unless this is a low spoke count wheel (doubtful from Canadian Tire) your spokes and rim are likely more than adequate strength. Fatigue failure of spokes is almost exclusively due to low spoke tension, and I suspect a Canadian Tire bike would have machine-built wheels and probably not retensioned since they left the factory.
AT this point my recommendation would be to tear the wheel down and rebuild it with all new spokes. Make sure the rim is not damaged, as this would be the ideal time to replace it if it is. If the rim (or hub) is damaged, you may wish to consider a replacement wheel, preferably built, or at least retensioned by your LBS staff.