Size of spare tire on 20" equipped tundras

[thumbster]

Can anyone tell me if the tundras that come with 20 inch alloy wheels actually use a 20 inch steel rim, or is it an identical alloy wheel that already is on the truck? I have 18 inch alloys and a same sized steel spare. The reduced weight of a steel rim makes me tempted to switch over and having the option of a 20 inch steel wheel would be very cool, but I'd be concerned of the additional flex and if it actually was a lighter wheel for sure. Steel rims are usually lighter than same sized alloys on smaller sizes. Any input or thoughts?

[reidsworks]

Mine came with 20" LTI alloys all the way around. I've already had a flat so used the spare. It is an 18" black steel wheel. Looks aweful when installed.
I might add that from my experience the alloy rims are actually lighter than a steel wheel. That is why they initially became so popular.

[david V]

Its just a simple black steel wheel. My 05 4runner had matching rim, which was cool. I damaged one rim, and made that one my spare.