The weight of a typical bicycle probably wouldn't be a problem. The
components of any bicycle are heavier than water, I think, but the overall
weight shouldn't be as bad as an additional human. That is, assuming that
the weight is reasonably distributed in the canoe.

Daniel

its own weight with just the ends showing above water. Put a
heavier-than-water bike in there and it might sink completely. Load
in some more heavy stuff (Coleman stove, frying pan, or whatever) and
you could be in real trouble if you capsize. Consequently, you need
to think seriously of lashing some floatation into the boat; even an
old inner tube will do, if it is lashed firmly into the hull belowe
the gunwhale line.