Maintenance is the best prevention. “Prevention is the best medicine, and if you’re taking care of your equipment it’s super key. Bikes don’t just fail. If they’re in really good working condition and you clean them at night, and you’re religious about it, bikes are kind of like cars — they’ll start talking to you if something is getting worn or getting creaky or needs to be replaced.”
Otherwise, this tool should serve the average commuter well. Specifically, we think you’ll find the size 4, 5, and 6 hex keys, extremely common sizes in bicycles, very helpful. They’ll adjust seat-post heights or let you remove the saddle entirely, or tighten a loose stem that’s always rattling apart. The Phillips head will tighten loose bolts on shoe cleats or the rear derailleur. The most common use for the torx would be adjusting disc brakes if you have ’em.
Some years ago, I used to live on my bike. Riding around daily through any weather condition was bound to quickly wear down on the bike over time. I like some of the stuff that you have in your toolkit. I would say zip ties are actually really convenient, because when something came loose you could go ahead and use those to fasten them down to keep on moving ahead until you had enough time to fix it or get it checked at a bike repair shop.
These are some great ideas, especially the simple ones like bringing a garbage bag. That’s something so easy and cheap that it’s easy to forget entirely, but as you say, it can make a huge difference in the right circumstances. It’s also good that you discuss some minor bike repairs. That’s another thing that can salvage or destroy your ride. You want to be as prepared as possible for the best possible experience.
Whether you ride a single, 7, or 10 speed bike or anything in between, you will need a slightly different chain. The major difference is that they come in varying widths to accomodate the different spaces between the gears, but quality of construction is also a factor in choosing a chain. Inspecing the chain should be a part of your regular cycle maintenance procedure- It’s important to keep a chain well lubricated, but oil will also attract dirt and so different oils for specific riding conditions are available. Remember to clean your chain regularly to get the longest life out of it and the gears.