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Boot, Tyre Boot A firm but flexible piece of anything that can be inserted between a tyre and a tube, to provide additional support at a damaged point. If the tyre is cut, gashed, or torn to the point your tube is visible, it will puncture again in short order, and that puncture is likely to be explosive not gradual. from Rear Tyre torn at rim - what was ...


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Velomobiles A special class of recumbent cycles is fully faired, mostly three wheeled (although there are four wheeled versions as well) called Velomobiles, although many people may know them by different names. The main advantage of a velomobile is higher speed for the same effort, but it comes at the price of being lower and therefor less visible on the ...


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Recumbent cycles Recumbent cycles come in two, three and four wheeled versions, in many different shapes and with many different riding characteristics. The only thing they all have in common is that the 'bottom bracket' is not low down between the wheels but farther forward and farther up. The sitting position is almost never bend over forward but can be ...


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Rim brake, e.g. cantilever, U- or V-brake, single or double pivot brake, side-pull brake Brakes help you control your speed and stop. Rim brakes include all types of brakes that push pads onto a rim's brake track. Park Tools has a page dedicated to identifying rim brake types. Rim brakes may also be called caliper brakes. Alternatively, "brake caliper&...


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Lights Units that provide illumination while you ride your bike. Energy will come via electricity in any modern light, but early lights may have been fuelled by kerosene or other combustibles. Modern lights will be LED-based, and older ones could have an incandescent filament lamp inside. Early liquid lights 1980s style, incandescent Modern LED ...


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Tolerances Every manufacturing process has variance. That is, for each dimension specified (e.g. diameter of a bore, length of a part, how round a bearing seat is, how parallel two bearing seats are), parts will vary slightly around the mean. In engineering and manufacturing, tolerance (link to Wikipedia) is the amount by which dimensions are allowed to vary....


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MIPS helmet A helmet with a low friction layer that allows the helmet to slide relative to the head following an angled impact. This is thought to reduce the rotational motion of the head during an impact, especially during an oblique impact. Previous helmets were not designed to protect against this type of acceleration. In theory, reducing the amount of ...


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Frame Sizing Bicycles may have nominal sizes, e.g. extra small through extra large, or they may have a centimeter size (e.g. Specialized's road frames in 2021 have 44cm, 49cm, 52 to 58cm in 2cm increments, and 61cm). Manufacturers usually recommend a range of heights for each size. In the past, road frames typically had equal length seat and top tubes, and ...


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Mudguard Stays / Fender Stays Holders/supports to attach the mudguard/fender to the frame, as pictured. A single stay has two legs with one on either side of the bike, and is secured to eyelets with a bolt, or bolted into a tapped hole or rivnut. If the frame lacks mounts it is possible to use P clips or zip ties, at the cost of rigidity. Normally made of ...


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