Can I upgrade a Norco Yorkville for a 260 pound rider plus cargo?
One solution for getting the load off the bike is to tow it in a trailer.

This would be overkill if you're carting around a waterbottle and a pocket of keys, but if you're loading the bike with 20+ kilos (44+ pounds) of stuff then moving it to its own axle could help.

Downside, trailers aren't cheap, and they will slow you down while riding.