From Roy Kao: wider tires may make a marginal improvement in transient cornering responses, but how often do you make radicalattitude changes on the street?
In summary [From Mark S]: Cost: worse Ride quality: worse Tramlining: worse Handling quickness: better Handling limits: better Safety in standing water, mud, or snow: worse Looks: better (imho) Steering feel: probably worse Braking: can’t say for sure Power application: probably worse A lot of the above depend on tire choice, too. Note that choice of tire will have a much much larger effect than changing wheel size on handling. Alignment also has a huge effect, as does tire pressure.