Tire Rack - Your performance experts for tires and wheels is one of many places for a spare.
15MM for the lug bolts. 5MM is just a tad small
I now ALWAYS carry a socket set with me with a 15MM ready for the worst to happen. While a socket set can be found almost anywhere, the fact is you have to be able to get to the place to get it first. Of course this is only if your wheel was loose and about to fall off because you took it off and then didn't torque it down after reinstalling it like an idiot.
Personally, I can live without a spare, lug wrench, and jack on my commute. If I am going on a trip I'd like to have those with me for peace of mind. I have a solution for that, I'll share it in about a month and a half.
