Re - Tired

[Hotrod_ace]

Hi, I'm looking at putting wheel discs on my Ford Ranger. It currently has 15" Rims with 225/70/15 Tires. The tires are almost bald so I was considering replacing them with LRR tires.
I would also like to install Wheel Disc too. I currently have aluminum wheels and would like to get the snap on discs but they only work on steel rims. I found several sets on craigslist in 14", 15" and 16". Does anyone know which diameter would be best for fuel economy. Also, is it possible to run a narrower LRR tire and if so what size would I need.
Any guidance would be much appreciated.
Thanks.

[Frank Lee]

You probably have the ultimate low RR tires, in the best size, on there right now!

[Patrick]

Continental]Continental CrossContact LX 215-15, 27.7" dia.; 225-15, 27.4" dia.; 215-17

General Grabber HTS 225-15, 27.4" dia.; 215-16, 27.9" dia.