Spare Tire Size?

So I'm about to buy the taco a new set of shoes, wheels and rubber. Going from 265/70/16 stock to 285/70/17.

My question is, when upgrading tire size do you buy a full sized spare or can I keep my 265/70/16 and use it as a spare to get me to a gas station for a tire repair?

...also I apologize if this has been asked before although I was searching through post after post after post but I need to goto bed and am ordering shoes in the AM. Thanks!

 

bump

 

You can keep the stock spare keeping 2 things in mind....

1. If you get a truck with limited slip, either electronic or "clutch type" and you get a flat on the rear you will have to put a front tire back there so both rear tires are turning at the same speed. Otherwise the clutch pack and or the electronics are gonna be pissed from the speed difference side to side....

2. Either way you will probably get an ABS light from having one wheel spinning at a different speed than the rest.

Any spare is better than none. I ran into a guy 2 years ago 20 miles east of Gerlach Nv. in the desert with a broken (made in China rim vs rock that you can pick up with one hand = chunks of aluminum in the dirt) 22" wheel and no spare, jack or tools. Storage space under rear seats was converted to speaker boxes so no "tools". Spare rim didn't match the bling so it was in the garage.