bicycle wheel truing stand
bicycle wheel truing stand
With modern bike parts, a little technical knowledge can go a long way to keep fit and make the best use your money. One of these useful concepts that you should understand if you plan to install your new bike or parts to give your ride a tune-up is the couple.
Torque / Tork / n: Measuring the force applied to an object to produce the rotation, usually measured in inches-pounds. The couple is determined by multiplying the force applied by the distance from the pivot point to the point where force is applied.
That the bolts and screws are tightened, causes the resistance of the bolt to twist and warp (they normalize once the force is removed). The extent of this force is called torque is measured by multiplying the applied force (book) by length (inches), the fulcrum used to turn the subject.
Couple cycling is increasingly important. As children, many of us went by the theory that the closer was better, and we remain on the keys to ensure that the rear wheel remains in place and keep the chain tight. Today is another story. You probably do not climb or work on many bikes to solid steel axles and nuts with torque limits seemingly infinite. Bikes today are carbon fiber and aluminum and titanium – composites that have softer limits torque rather special.
Tighten collar around a carbon handlebar too tight and you run the risk of crushing the bar and stripping or breaking the bolt soft alloy. In the meantime, if you are very wise, a loose bolt can cause as much damage, just ask anyone who has had bars on a long slide down a slide or rod saddle in the middle of a long ride. The key is to build using the maximum permissible torque without damaging the bolt or any component that is affected.
How is the couple? A quick calculation:
Let's say we need to shake a fixation 120 in-lbs. We have a ratchet lever is 1 foot (12 inches) long. We must apply 10 lbs of pressure at the end of the lever to achieve the 120 in. lbs.
£ 10 x 12 in. = 120 in. / lb
It also shows how a bar "cheater" or extender key aid in strengthening or loosening a bolt difficult. The higher the leverage, strength and less necessary to achieve the same level of torque. If we replace the 1-foot lever with a 10-lever foot, how many applied force we need to reach our 120 in-lbs?
(X) x 120 lbs = 120 inch / lbs
1 x 120 = 120
Fortunately, torque wrenches do these calculations for us. You can adjust the setting or watch the indicator of your key and it tells you when you reach your torque desired. Beam-type torque wrenches and digital can also easily tell you how tight or bolt was as you remove it (a good how to test this last mechanic who worked on the bike).
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