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Posts Tagged ‘bicycle’

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.

If you’re a racer, comfort will not be your only consideration. Indeed, it may be down among the last elements you consider. Speed is not usually built from comfort, and the road bike frame that promotes speed is built of different materials than one used primarily for recreational riding. Frames can be made of titanium, chrome-moly, aluminum or steel, and each metal has different advantages of weight and strength. Frame geometry varies, too, with touring bikes featuring a longer vertical base and top tube than the skittish racing models.

So when you’re looking at road bike frames, think beyond the paint. Get a frame that fits both you and your purpose. Whether you do your research online or in a good bike store, you’ll be glad you took the time.

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 no fax payday loan 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!

Meanwhile, if your bicycle rims are aluminum, as most are today (steel rims being heavy, carbon rims being expensive), there is very little you need to do for them. As with all parts of your bicycle, rims should be kept clean of dirt and corrosive oils, wiped after long dusty rides and examined after any crash. Otherwise, do what most riders have always done: forget about your bicycle rims. You may not be able to ride a bike without them, but you really cannot ride a bike better for thinking about this vital but happily innocuous part.

The first bicycle wheels were from a horse drawn cart, made of wood with a metal band round the bicycle rim, very hard and very uncomfortable to ride. Then a man called Dunlop (Scottish) invented the pneumatic tire, this along with Macadam (another Scot) inventing the tar road surface made cycling a lot more comfortable.

The bicycle rim, like the bicycle frame hasn’t changed much in design, its still round and always will be. From the first wooden rims the next were made of steel, then alloy and now if you can afford it, carbon. Of all bicycle parts the bicycle rim can make a big difference to how your bike handles. First the weight of your rim affects your sprinting and climbing as the weight will low you down, for a long, flat effort the weight isn’t so important as when you get the wheels rolling the weight can help to keep them going. The shape of the rim can be important also, a flat rim is best for climbing as aerodynamics are not so important on a hill, a deep section, aero, rim will help you cut through the air, but in a cross wind could cause you handling problems.

Bicycle Rims Materials

The different materials used for rims are very important also, steel is heavy and if damaged can be difficult to pull back into shape, but because its so strong it is quite difficult to bend in the first place and steel is cheaper than all the other materials. Alloy is probably the most popular rim, it can be made in any shape and profile, flat or aero, but not too deep as it would then weigh too much, most deep section rims are of a alloy braking section nearest the tire which is then mounted to a carbon deep section for lightness and aerodynamics and a very beautiful looking bicycle rim. As with most things if money is no problem you can go for the best, this would be an all carbon rim, strong and very light, but there are a few problems with these rims, first they don’t brake so well in wet conditions and you must use special brake blocks for carbon and they can be expensive, also the rim has to be perfectly round and not have any bulges in the rim wall as this will make braking quite erratic, carbon is a difficult material to work with and must be well looked after.

Types Of Rim To Consider

There are also two types of rim to consider and this depends on which kind of tire you want to use, first there are tubular tires these are glued on to the bicycle rim, cost more and are difficult to repair after a puncture, but for racing they feel and ride wonderfully. Clincher tires have improved a lot recently and are nearly as good as tubulars for performance and are easily repairable and more reasonably priced. Most manufacturers make all styles in both systems.

So which should I buy? Not an easy answer, as there is so much to choose from, years ago you went to your local bike shop, picked out which hubs, spokes and rims you wanted and he would build your wheels, but now most rim makers also manufacture there own wheel sets, Mavic, Shimano and Campagnolo are probably the best known, check out there web-sites for all there new goodies, there are other brands and if you go to your local cycle shop or look in the bike magazines you’ll find them. There is a lot to choose form, but they are all round.