Metcalf
Expedition Leader
There are a few downsides to this. Weight is something of an issue, pinch flats are super common and removing tires requires a super long awkward allen wrench not everyone carries.
Plus, if you have a flat and run on the runflat (heh) you'll destroy the tire after a while.
I can't understand why its so difficult to carry a spare. Its just common sense, flats aren't common or unusual, they're simply unpredictable. Never underestimate our friend Murphy. the one time you don't carry a spare, your tires go flat.
A spare tire has it's own weight, space, and visibility compromises.
You have 4 tires, why only carry one spare? Why not 2? Why not 4? Everyone is going to have their own line in the sand and push different boundaries. Most motorcycle travelers, even some that do a LOT of rough international travel, do not carry a spare tire.
I've not carried a spare lots of times, often though terrain that was difficult enough that NOT having the spare tire weight makes a noticeable difference in vehicle performance. I don't do it all the time, but lately I have been leaning towards less rather than more. I haven't carried a spare wheel on most of my off road vehicles for years. I only carry the TIRE....and then pack gear inside to save space. Swapping a tire onto a wheel is an acceptable compromise for me. There are a LOT of different ways to repair tires in many situations that don't take up nearly as much space/weight as a full size spare tire. I'd argue that having the proper tools to fix a tire....on board air, plug kit, patches, tube, etc...will fix MORE issues for the weight/space than a single spare tire.
There isn't going to be just one answer. Some people are going to play it super conservative with 2+ spare tires.....some people are not.