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Not sure where you get diesel motorbikes, but ethanol is easily made gasoline replacement. And also propane while it lasts, because it doesn't go bad at all. Then when it's not around anymore, wood gas is an option
As long as you keep it well sealed, gasoline esp sold in summer should last some decent time, just like winter diesel (less wax to form precipitate). I think one of big problems would be bacterial degradation (yes there are bacteria that feed on hydrocarbons)
I was thinking of a situation where the people had enough skills and knowhow to make conversions of existing bikes.
https://www.motorcycles.news/en/biodiesel-harley-kubota-conversion/
In that situation, you might be better off converting to using propane or ethanol like you suggested depending on available resources and expertise.
Unfortunately, I don’t think you’re right about gasoline’s shelf life however. If stored properly AND stabilized it looks like around 3 years is the best you could hope for.
https://build-construct.com/practical-guide/gasoline-shelf-life-how-long-does-fuel-last-and-how-to-store-it-properly/
The conversion is a possibility, but mechanics also requires an eco-system of parts or at least machining. Let's say you're a machinist. How are you going to run your machines without electricity? With a generator, of course. But what if you need a part for that generator?
There's an ever-expanding web of dependencies...
And you can scavenge and modify, but rubber's another issue. It gets dry and brittle with time. Where are you going to get more rubber?
You can figure something out with enough time and effort, I guess, but that's time and effort likely spent elsewhere, especially if gas isn´t cheap. A lot about vehicles requires economy of scale and global supply chains.
For sure! Ideally you have enough redundancy in machining and power generation and such that you can sustain yourself for a while, but it’s highly likely that you end up needing a component you can’t replace or substitute that causes you to lose capability over time and eventually you backslide to something like American pioneer level tech plus a few things you can limp along with.
That said, with a water wheel and some basic hand tools along with a a lot of starting equipment, you might be able to maintain a few key machines for quite some time.
Having a working lathe and blacksmith shop with starting tools would get you pretty far for quite some time if you had enough people with some skills to use them.
But yeah, eventually you’re probably back on horses livestock power for the most part until you can build enough stability back up to start specializing and trading and such.
Yes, surely a lot of what we would be doing is going backwards, to watermills and smithies; but I wonder what would be new, what little tricks and things we've learned that would be thoroughly modern.
Edit: I'll answer my own question: Photovoltaics last forever. You can rip 'em off abandoned homes pretty easily.
Solar electricity would still be an option. Lots of people will want electricity, so it's pricey, but if you're the only guy that can make essential machine parts you can probably afford it.
If you were a caveman starting over, a waterwheel has about the needed output. Heck, some of the first metal lathes might have run on those, historically.
Rubber might just be a wonder you'll have to do without, if you're somewhere temperate.
I did a search for a diesel bike and on a national bike sales data base and found nothing; you are more likely to find a horse.
The internet tells me gas can last conservatively up to 12 months, but ethanol no more than 3 months. Most post-apocalyptic narratives are built around travelling, and if people are getting around by locally-produced ethanol, you are doing more of post-post-apocalyptic story.
A diesel bike would be very impractical due to the nature of how diesel is combusted vs gasoline. It requires a much bigger engine block and compression. A much easier option is to just tweak a gas engine to run on pure ethanol. And that works particularly well for a small motor bike over a car.