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Park Tool TW-5 Torque Wrench

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Torque for mechanics is simply a twisting or turning motion around the axis of the thread. This resistance can be correlated to, but is not a direct measurement of, fastener tension. Generally, the higher the rotational resistance, the greater tension in the threaded fastener. In other words, the more effort it takes to tighten a bolt, the tighter it is. The struggle here is it can be hard to read the raised numbers, especially if you’re wrenching in a poorly lit hotel room, or adjusting a saddle bolt upside down. It’s comfortable to use, but the hollow plastic construction certainly feels cheap and can lead to clearance issues in rare cases. In fact, using many torque wrenches 'the wrong way' can damage their mechanism and stop them from accurately gauging the level or torque. If the tool you've got does not do reverse thread, don't try and use it for reverse thread (or for loosening bolts). Torque wrenches are simply tools for measuring resistance to rotation. There is a correlation between the tension in the bolt and the effort it takes to turn it. Any tool, even a torque wrench, should be used with common sense. A cross-threaded bolt will not properly tighten even with a torque wrench. The mechanic must be aware of the purpose of torque, and what torque and fastener preload are doing to the component joint. It is also important to consider thread preparation, which is discussed in detail in this article.

Measured torque not typically used. Common industry practice is resistance at lever half way through swing from open to fully closed. For more see Tire and Tube Removal and Installation. An adjustable torque wrench release in exactly the same way, you just adjust the dial to match the torque setting on the bolt first. How do I know how much torque to use? The TW-5.2 from Park Tool is a conventional ratcheting torque wrench designed for lower torque settings that you typically find on bike components. If you are tightening bolts where there are two or more in the same location, such as on the stem, make sure you tighten each bolt evenly rather than fully torque one and then the other. Not using a torque wrench puts you at risk of a bolt snapping, or indeed a delicate, carbon component giving way or being crushed under too much pressure. In the case of a handlebar, this can be dangerous; and if it’s proven that you’d overtightened a bolt and caused the fracture then your chances of a warranty claim could be voided.This isn’t too surprising given that like a gauge, torque wrenches are typically most accurate in the middle range; reducing that range results in greater precision.

It works like a beam-type torque wrench and so you stop tightening once the needle hits the desired number. The Lifeline Essential Torque Wrench set is a simple, yet effective, and very tactile torque tool that will do most (small) tasks that the average home bicycle mechanic is likely to take on. Firstly, make sure you are holding the tool properly. If you are holding the tool by the head or in the middle, you are putting more torque through the bolt than you are intending. You should hold the torque wrench by the grip. Without the torque driver involved, the rest of the handle can be used to loosen off bolts – again in a range of configurations – saving the ratchet from damage. The ‘Deluxe’ tool wrap and bits are great quality and it even includes a free calibration service (in Italy…). All wrapped up, it’s compact and doesn’t waste space in the toolbox.

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Below is a table of torque equivalents and formulas for conversions follow the torque table. The table is also available as a PDF file. Given the number of affordable designs available elsewhere, there isn’t much to argue in favour of the beam-style torque wrench. That said, it’s certainly better to use a beam-style torque wrench than not to use anything. Best torque wrenches for cyclists, as rated by our expert testers NOTE: Torque wrenches are measuring instruments and are not intended for use as a general-purpose ratcheting driver. Do not exceed 14 Nm when using the TW-5.2. Repair & Service Threaded fasteners, such as nuts and bolts, are used to hold many components to the bike. As a fastener is tightened, the fastener actually flexes and stretches, much like a rubber band. This stretching is not permanent, but it gives the joint force to hold together, called “preload,” or tension. Each fastener is designed for a certain range of tension. Too much tightening will deform the threads or the parts. Too little preload will mean the fastener will loosen with use. This can damage components, such as a crank ridden with a loose mounting bolt. Loose bolts and nuts are also generally the source of various creaking on the bike.

The main reason to tighten a bot to the correct torque is for safety. If you over tighten a bolt, it can break or damage the part it’s attached to. Conversely if it’s not tight enough, it can work loose, which can accelerate wear or cause a failure. A loose bolt on a saddle clamp will only cause it to creak or move when you sit on it but there are situations where it can cause damage to the bolt. One of the most common bolts to come loose is the one holding your crank in place and if you keep on riding this can mangle the interface and mean costly replacement. The TW-5.2 has a range of 2–14 Nm (18–124 inch-pounds). The TW-6.2 has a range of 10–60 Nm (88–530 inch-pounds). Knowing how to use a torque wrench is key, because it is still possible to under- or over-tighten bolts with one if you are not careful.

TW-2.2 Features

The main handle and torque part of the tool can be put together in several configurations which mean it can get into tight spots where other tools may not be able to reach awkwardly positioned bolts. A torque limiter uses a built-in clutch system designed to release when the resistance at the fastener exceeds the resistance of the clutch. Generally, torque limiters are used on lower-torque fasteners such as stems, bars, rotor bolts, cable pinch bolts, etc. With the parts slotted together, you can feel the join between them, given away by a movement that I feel wouldn’t be there if each part was more precisely sized to slot together more snuggly. There's an array of different alternative bolt sizes used in headsets and stems, particularly proprietary designs, while things like chainset bolts tend to be a different size again. Anything else I should look out for? There’s a couple of hundred bolts on the average mountain bike and every single one of them has a recommended torque setting. This simply means they have an optimum tightness, which is just enough to hold whatever it is in place but not too much as to damage the fastener or the part it’s attached to.

Effetto’s Mariposa Giustaforza II 2-16 Pro Deluxe torque wrench is a high-quality option. David Rome / Immediate Media This tool offers everything we loved about the Park Tool PTD, but with further adjustment options. Accuracy is not quite as consistent as the preset options, but certainly close enough. Its American-made build quality is superb, but that does mean it’s heavy and priced relatively high. Hey, that looks just like the LifeLine Professional or the Pedro’s Demi,” I hear you say. Yep, there’s a good reason for that – it’s the same. Sourced from Taiwan, this Shimano/PRO item is a rebadged tool, but there’s a good reason so many brands put their label on it – it does exactly what it should. On the other hand, you have to carefully read the beam in relation to a scale to know that you have achieved the correct torque. This can be difficult if the unit you are torquing to isn’t printed on the scale or if you are aiming for a decimal. You’ll also need a steady hand. Most beam-style torque wrenches for bicycles tend to be aimed at the entry point of the market and are often made of plastic or more flexible materials. Park Tool’s TW-5.2 uses a 3/8in drive rather than the smaller 1/4in head, which means it isn’t as easy to wield in smaller spaces. Yet it feels much better quality, with less play and movement at the head than other options, especially under higher torque loads.Like everything Lezyne, it looks and feels well-made and robust. A good addition to a handlebar bag for when you need to get those adjustments just right while riding a long way from home. Even so, the kit looks the part when you open it up and the main body of the tool is very satisfying to hold. Its tactile nature had me testing the torque of multiple bolts on my bike just to be able to use it again. Park Tool offers two styles of beam type torque wrenches. Both wrenches use 3/8″ square drive to accept standard 3/8″ bits. A preset torque wrench looks much like a normal Allen key, with a handle. It will tighten the bolt to the ideal tension. These are light and easy to transport, as well as being highly accurate since they can’t be adjusted.

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