Floor Pump1 of 10
You could ask around for one to borrow, but you're better off bringing your own trusty floor pump to fill your bike tires to the ideal psi before toeing the line. You'll be more familiar with the gauge accuracy and not be in as much of a rush to get it back to its owner.
Bonus Spare Tube2 of 10
If you've arrived at a race only to find you have a flat, be prepared with an extra, extra tube. Leave your on-the-bike spare tubes, tire levers and CO2 cartridges in place, in case you need them mid-race.
Plumber's Teflon Tape3 of 10
If you use deep-profile race wheels and have to change a tube before racing, put a wrap of plumber's Teflon tape on the tube valve threads before swapping your valve extender. This will create an air-tight seal between the extender and the valve, which will keep air from escaping while pumping your tire and keep your pre-race frustrations low.
Disc Wheel Valve Adapter4 of 10
This adapter, also known as a "crack pipe" because of its resemblance to a device one would use for pipe smoking, will allow you to inflate the tube in a disc wheel without damaging the wheel or the tube valve. You might want to keep one of these must-have tools in your on-bike spare pack, too.
Multi-tool5 of 10
Even if you have one already packed in your flat kit, having a second, easily accessible multi-tool at the ready will save your time and trouble. You'll want one with 2.5mm/3mm/4mm/5mm/6mm allen wrenches and flathead and Phillips head screwdrivers.
Torque Wrench6 of 10
If you notice any of your fasteners have come loose in travel, you'll need to snug them up but not crank them down. Overtightening bolts and fasteners can have catastrophic consequences, such as sheared aluminum or cracked carbon. Use a torque wrench to snug loose bolts to the proper manufacturer specification—those little numbers with Nm printed on your bike and its components.
Spare Battery7 of 10
You spent a lot of money when you bought a new bike with electronic shifting, paid your race entry fees months in advance and already checked into your hotel room. Don't let a little lack of power—or forgetting to "top off" your drivetrain battery—ruin your race. Bring a fully-charged, spare battery with you, just in case.
Electrician's Tape8 of 10
Unlike duct tape, this is the do-it-all tape that's not terrible for your bike. Use electrician's tape to fasten almost anything that cannot be secured with a torque or Allen wrench, or to secure race nutrition to your bike frame.
And wait, it gets better. Have you ever left your wedding band on instead of leaving it at home? A band of electrical tape will even keep it on your finger throughout the race (and save you a difficult conversation with your significant other later).
Chain Lube9 of 10
If you've driven your bike through rain on your way to a race, you'll want to give your chain a quick lube before you start cranking. Just a small amount of chain lube will silence squeaks, as well as also reduce friction, which means more speed for the same effort.