Years ago I had a 72 Corolla that I put mag wheels with somewhat wider and lower profile tires. The ride was very harsh but I lived with it. Some time later I learned about "unsprung wheel weight".
Any ideas out there on the general weight of the aftermarket wheels vs standard for the xB?

Walt

almost always heavier unless they're track lights

Yeah, it's rare that a bigger wider rim is going to be lighter
then those skinny stock steels. And aftermarket companies
don't often advertise their wheel weight for the simple fact
that 99% of the people putting the wheels on are doing it
for looks rather then performance.

Shop around, or check with a shop that has them in stock.
A good shop with quality customer service will find those
wheel weights for you.

check out the Kosei K1 TS, 10lbs
and SSR Competition, below 9lbs but $$300 each.