500 miles is no big deal, although your chain will last longer if you can give it attention a little more often than this. Some guys never lube o-ring chains. They don't get great chain life, but they typically work Okay for 10K or so.
There are lots of options for carrying chain lube - a small plastic bottle with 90W gear oil is just about as good a chain lube as the fancy aerosol stuff. More trouble to apply, but it works just as well. And there are some pretty small cans of spray lube (e.g., 6oz) readily available.
I strongly suggest you sort some kind of luggage option though. When you make 500-mile trips you need to be able to carry more than what fits in the tail: a flat kit and pump/compressor/CO2 cartridges, faceshield cleaner, rain gear, some water and perhaps a snack, a spare pair of gloves, cell phone, spare ear plugs, a leatherman type tool, an extra layer of clothes, etc. You can go backpack or sort some kind of tank bag or tail pack, but regardless, to be going on 500-mile trips without having any way to handle the more common contingencies is just not being adequately prepared. Once you have this sorted, carrying a little chain lube won't be a big deal.
- Mark
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