Why accessories change how a bike rides
A bike with nothing on it is simple. Add a lock, a pump, a phone mount and a camera, and the bike gets heavier, noisier and sometimes less predictable. None of these items is a problem on its own, but each one has a right place and a wrong place. The wrong place is usually somewhere it can swing, rattle, snag a cable or drop into a spinning wheel.
This guide starts with the item most city riders carry every day, the lock, and then gives a short tour of the other common accessories. The general rule is the same throughout: anything you carry should be fixed firmly, kept clear of the wheels, brakes and cables, and never need your attention while the bike is moving.
Carrying a lock without it swinging into the wheel
Locks are dense and often the heaviest accessory you own. A loose lock is the classic cause of trouble: it bounces against the frame, works its way along a bar, or hangs low enough to reach the spokes. A lock caught in a wheel can stop the bike suddenly, which is a real fall risk, so the aim is to remove any chance of that.
There are three common ways to carry one.
On the frame
Many locks come with a bracket or a strap that holds them to the frame tubes. This keeps the weight low and central, which generally suits handling best. Check that the bracket cannot rotate, that the lock does not touch the tyre or the brake cables, and that it clears your knees when you pedal or stand. Rubber or foam padding between lock and paint stops rattles and scuffs. Frame shapes differ a lot, and small or unusual frames may not leave a safe spot, so do not force a fit.
In a bag
A lock inside a pannier or backpack is out of the way and cannot reach the wheel. The trade-offs are weight on your back, if you use a backpack, and a bag that is harder to open. If you prefer luggage, the usual rules for bike bags for riding apply: pack the heaviest item low and close to the body, and close every zip so nothing can slip out.
On a rack
A lock strapped on top of a rack, or held in a bag on it, keeps the weight over the rear wheel. Make sure it is tied down on both sides and cannot slide forward into the saddle area or sideways into a wheel. Anyone new to rear rack cycling will notice the bike feels a little different when pulling away, because extra weight behind the saddle changes how the bike steers and brakes. Allow a bit more room to stop.
Two carrying methods are best avoided: looping a chain or cable around your waist or the handlebars where it can unravel, and hanging a heavy lock from the handlebars where it swings and pulls the steering to one side. If your lock is long, folded or coiled, fasten every loose end.
A short test helps. With the bike stationary, lift each wheel and spin it by hand to check that nothing touches. Then roll slowly on flat, quiet ground and listen for knocking. Fix any noise before you go further.
Locking the bike at your destination
Carrying a lock is only half the job; using it well is the other half. In brief, choose a solid fixture that cannot be lifted or cut, lock the frame and ideally a wheel to it, and avoid leaving a bike in the same quiet spot overnight. No lock makes theft impossible, and quality and technique reduce the risk rather than remove it. The details of how to lock a bike securely, such as choosing fixtures and securing the wheels, are a topic of their own.
A quick tour of other accessories
Pumps and repair gear
A mini pump or similar is worth carrying so a soft tyre does not end your ride. Mount it on the frame, or keep it in a bag, so it does not rub or fall off. Pair it with a few basic bike tools and a spare tube or patch kit. Practise fixing a flat at home first, because the first attempt is much easier in a dry living room than at a roadside. Always follow the manufacturer’s instructions for the items you own and see a bike shop for anything beyond simple fixes.
Helmets
A helmet only helps when it fits and sits properly. Choosing a helmet comes down to sizing, strap adjustment and checking it feels stable without pressure points. Helmets are generally designed for a single significant impact, so after a fall it is sensible to follow the maker’s advice on replacement rather than assume it is fine.
Phones, cameras and computers
Phones and cameras are handy but pull your attention away. Mount them firmly, set them up before you start, and leave them alone while moving. If you use one for directions or tracking, riding with a bike computer or a mounted phone is only sensible when glances are brief and the road is clear. Pull over when you need more than a second or two.
Lights and bells
If you ride at dusk or after dark, riding with bike lights is a basic safety measure, and a small bell helps you pass people politely on shared routes. Neither takes much space, so they are easy to keep on the bike permanently.
Setting up a sensible kit
Start small. A lock you can carry securely, a pump, a tube, a small tool, a helmet that fits and lights if you need them cover most everyday rides. Add extras only when you notice a real need.
Before each ride, give the bike a quick shake and listen. Anything that clanks, swings or moves is a candidate for a better mount. Check that your accessories do not block a brake lever, hide a reflector or limit how far you can turn the bars.
Rules about what you may carry, how you must signal and where you must use lights differ between places, so check your local laws. This guide is general information, not engineering or legal advice. Once you have a carrying system that stays quiet and secure, you can stop thinking about the kit and concentrate on the road.