Whether you’re shopping for a bike or just admiring them, the first part you notice is probably the bicycle frame. The frame is the heart of a bicycle, as well as its art. Including the basically triangular core structure that supports both seat and handlebars and the extensions that attach to the wheels, the color and the geometry of the bicycle frame not only affects the beauty of the bike, but its strength and speed as well. The pleasure and success you derive from bicycle riding will be strongly impacted by having the right frame for your physique and your purposes.

The Two Most Important Aspects of Bicycle Frames Are Their Materials and Their Configuration

Naturally, your bicycle frame will take into dramatic account whether you ride primarily on roads or off-road. Not only are so-called mountain bike frames made of noticeably bigger “tubes,” they are made of more shock resistant materials, with stronger weldings. Road bike frames have a smaller triangular geometry and the main consideration in their material is its weight. Everything on a road bike is designed to keep the rider’s resistance to a minimum in order to promote fluency and speed, while a mountain bike is designed with the primary goal of shock absorption and maneuverability in mind alongside speed-influencing factors.

Even among these two main divisions, you will find major differences in bicycle frames. Road bikes used primarily for touring or recreational riding will have frames with a more relaxed geometry and more total horizontal spread front to back, while racing bikes will tighten that structure for a shorter front to back bike length. A tighter triangle and less distance between the bicycle frame and the tires acts to decrease the resistance of wind and road for a racer, as well as to increase the bike’s ability to respond to the quick, minute maneuverings road racing requires.
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BMX racing is a fun sport for young people. For kids, the basic bike should have 20-inch wheels. Riders under age six can use whatever type of bike they have, even if it’s not a true BMX freestyle bike. These little folks might still be riding bikes with wheels as small as 12-inches. Some tracks even have races for Big Wheel bikes.

A cruiser or mountain bike with 24-inch or 26-inch wheels might be okay, too, but check ahead of time with your local track for advice. Many tracks will let you race a mountain bike in the “Cruiser” class.

Whatever bike you use should be equipped this way. Remove all reflectors. Take off the kickstand and chainguard to prevent injury in a wreck.

The bike should have pads on the top tube, stem and crossbar. Most BMX freestyle bikes already have these pads. If your bike doesn’t have them, adding this safety feature will cost about $5.
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For most of us, well-intentioned but casual bike riders who secretly believe we might be Lance Armstrong’s heir if we only had a few more hours a day to spend on our bicycles, buying a new road bike is tantamount to buying a road bike frame. The frame is what we’re thinking of, something new and shiny and colorful, something we suspect even car drivers envy when they see us flash through the snarl of traffic. Truly, a road bike frame is a beautiful thing and part of the reason we love bicycling.

When you have the good fortune to be looking at new bicycles, though, you definitely want to look at a few elements besides the color of a road bike frame. Face it. When you’re on your way back home from a long Sunday ride and you’re riding your thirty-fifth mile smack into a stiff headwind, the fact that your frame is cobalt blue or even Bianchi green is not going to help you. The length of your seat tube is going to help you and the length of your top tube and even the angle of the three main tubes all put together is going to help (or hinder) you, but color is not.

If you shop at a discount store or even a general purpose sports store, if you get any help at all in choosing a bike that fits you, it will probably consist of a clerk instructing you to stand over the top bar of the frame and see if you can comfortably straddle it with your feet on the floor. This is not really particularly helpful, especially if you happen to have anything unique about your physique, like long legs combined with a short torso. If you have long legs, you can straddle almost any bike, but will your body be able to relax comfortable in the stretch between your saddle and the handlebars? The whole geometry of the road bike frame matters a lot to fit. And fit matters excessively to comfort.
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Barring a serious crash or the most frequent bike accident of all—entering the garage with a bicycle on your car roof rack—your bicycle rims will probably last as long as you can stand riding the same old bike. Usually made of aluminum, rims are lightweight and strong and are hardly ever the source of trouble on a bicycle, even in the most arduous riding conditions.

In fact, most bicycle riders probably never give a single thought to their bicycle rims. The circular band of metal that holds in the bike tire and connects it to the wheel hub via spokes is easily overlooked. Unlike spokes, a bicycle rim hardly ever breaks. Unlike the hub, it hardly ever causes problems. Unlike tires, it never goes flat or explodes. Serious bicycle racers have some pretty fancy rims, full of the same outrageously colorful advertising that covers their clothing usually, but most riders really don’t need these. Even the fanciest rims, the flattened out, wide, presumably aerodynamic rims you’ll see on the wheels of the pros, are not certainly all that much better. They are, however, flashier, and in the world of bicycling, this apparently does count for something, maybe for intimidation.

Do you need to know anything special about your bicycle rims? Not really. Most bicycles come with rims appropriate to their overall quality. You can spend as much money as you want on a rim—like everything else associated with the sport of bicycling—but what comes standard on a bike is probably sufficient. Customizing your rims will bring you fancier rims, maybe lighter rims, probably stronger rims, but the research on what constitutes the best rim weight, strength and shape is still largely inconclusive, and since this feature causes so few problems to the recreational rider, you can leave this issue to the professional mechanic who services the bicycles of world class racers. When they’ve resolved the issue, you will know about it!
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