Great job Julian on getting wheel recommendations up on TireRack.com! That's very helpful.
Some of the following info has been posted previously but I confirmed with Ford today the specs of the stock 2013 ST wheels as well as the full size spare specs which I have not seen anywhere else.
Stock 18" Wheel:
Wheel Size: 18 x 8
Hub Size: 63.3mm
Tire Size: 235/40/18
Wheel Size: 16 x 6.5
Tire Size: 215/55/16
The Ford rep would not confirm any other info relating to these wheels/tires but did say that he assumes the hub size of the spare wheel to be the same as the 18" wheel as it would not make sense to be different. I asked if the spare is the same steel wheel for the regular Focus and he would not commit to an answer.
2013 Focus ST3
Ordered 9/20/12 • DORA 9/20 • Ford Confirmation Email 9/24 • VIN & Build-Week-of-10/29 10/4
Build-Day-10/29 & ETA-of-11/5 10/15 • Window Sticker 10/22 • Delivery 11/8/12!