motorcycle spoke length calculator

Error becomes worse for small wheels/large flanges. I thank Roger Musson for permission to use the photo below, with cross-sectioned spoke nipples. The combination on the left risks breaking the spoke nipple just below the head, because the spoke does not extend up into the head of the nipple. Slide one end of the tape back and forth along the rim until the measurement is largest. That allows some minimal stretch and helps to better absorb impact. When taking measurements, record the following information. And then there also are various hubs used in mountain bikes and road bikes. You can't get a "contact" measurement this way, but inaccuracy of a small fraction of a millimeter isn't going to be important here. The threads of all four spokes in the image below extend equally far. Then start with another rim.) As carpenters say, "measure twice and cut once" or in this case, measure twice and select spokes once. For road racing or time trials, high profile or aero rims are used, which have a better rigidity to weight ratio and are supposed to reduce drag – but that doesn’t really work at speeds below 35 km/h. A metric tape would make measurement easier, but let's calculate: 29/64 is 0.453125, and so the length measures as 11.435125 inches. at the deeper, smaller holes in this double-wall rim. The table below summarizes the effects of measurement errors. The axle gets in the way when measuring the diameter of the circle of spoke holes (d in the image at the right). Screw down the nut until it rests against the ruler. C = \/A2 + B2 - 2AB cos θ. The traditional way to measure the spoke hole circle diameter is with a caliper, as shown in the image below, center to center of the spoke holes, but it's easier to measure from the right side to the right side, or left side to left side. We'll have another page for them soon! Measure to the nearest 1mm or 1/32 inch, or better. You can measure the circumference of a rim by wrapping a measuring tape all the way around the rim. Triple-crossed: The classic – and of course the one we described in our instructions. You don't have to know the formula for spoke length. The Sutherland system includes a tool to find the effective rim diameter for spoking. Longer threads prevent a spoke with short threads from screwing in all the way, so check for compatibility. Get out your pocket calculator or smartphone app (or a paper and pencil if you're retro or the battery is dead). This is a difference in radius and applies to each spoke. Insert the spoke in the middle one of the three free holes. This step applies the Pythagorean Theorem for the hypotenuse (slant side) of a right triangle, with a slight correction to account for the size of the spoke holes in the hub: Each of the hub's two flanges may be a different distance from the centerline, as indicated by the blue and green lines -- image modified from one by keithonearth on Wikipedia. Multiplying by 25.4 gives 530.2 mm. The first spoke is hooked in at the peak of a large 'V' in the hub from the top. But why did we do that? . Online information is, to be sure, useful in identifying parts and in confirming your measurements. We are the first 100% climate-neutral online outdoor retailer certified by ClimatePartner. The length of the stainless spokes for motorcycles is selected according to the customer's order, depending on the motorcycle model or according to the spoke pattern sent to us. Then as shown in the image at the right, transfer this measurement to the ruler, resting your fingernail lightly against its end. You may skip over this section in case you like. You can get a rough idea of whether the spoke tension is even if all spoke nipples jut out the same length. you can contact us here. We have an article about that. Single or double-crossed: A good option for riders with little body weight, because the weight reduction can be a real plus. The hubs on the front and real wheels differ, as the rear wheel hub has to hold the sprocket wheel or the actual transmission (internal hub gear). Disclaimer: Use at own risk. The measured depth from the outside of the rim to the spoke hole is 11 mm. The threaded end of this spoke measures at 11 29/64 inches (halfway between the 11 7/16 and 11 15/32 marks on the measuring tape). Insert the first spoke on the rim in the hole on the left next to the air valve.         _________________ Spoke lengths are given in millimeters, so you need to come up with measurements in millimeters. If necessary, measure the depth from the measured diameter to a spoke hole; If necessary, calculate the rim's diameter where the heads of the. mm (right) The ruler and the manufacturer's identified spoke length agree very well. Measurements for Spoke Length Calculations, Roger Musson -- wheelbuilding book, spoke calculator. An easy to use spoke length calculator with a large amount of hubs and rims in its database. You then derive the diameter from the circumference. and spoking diameter. The leftmost nipple is threaded on until the threads start to bind. The first step creates a virtual measuring point directly below the spoke holes in the rim. Insert the bolt. Next, turning the hub over and measuring the other end, the left flange is 35mm from the left locknut. These are supposed to help reduce wind resistance – but that only works if they are aligned precisely. Disclaimer: Use at own risk. The first step is to calculate the length of the third side of a triangle according to the cosine rule formula, Turn the spoke in clockwise direction, until it has crossed three mounted spokes: the first two at the top, the third at the bottom. I recommend doing both. Multiplying that number by 25.4 to convert to millimeters and lopping off meaningless decimal places gives 290.9mm. High-quality spokes that have to deal with high stresses often have a smaller cross section of 1.8 mm in the straight part and/or a larger cross section in the arc. An example is shown below, using the same hub. Then use the ruler to measure the length between the nut and the end of the bolt. Resting the locknut against the edge of a workbench or table makes measurement easier. of hub and rim measurements and re-use them in future wheel builds. The importance of the hub spoke hole circle diameter depends on the spoking pattern. The rim shown is a double-wall rim with recessed spoke holes and no eyelets. The right flange, at 50mm from the right locknut, is 67.5-50mm or 17.5mm from the centerline of the hub and the left flange at 35mm from the left locknut is 67.5-35mm or 32.5mm from the centerline. At other times you'll find us in the mountains! It may look super complicated at first glance, but it really isn’t all that bad. Again, if your ruler only measures in inches, you need to convert to millimeters. Spoke length non-gear side: Spoke length gear side: Sapim cannot be held liable or responsible in respect of the use of this online calculator, data entered, nor for the results produced by any party using this online calculator… With higher cross numbers, the effect on spoke length becomes smaller and smaller. Below is a list of trusted online calculators that you can use to check against this one and help CALCULATE Result : Spoke length: mm: Caution ! If the diameter falls partway between millimeter or 1/32 inch marks on the tape, you could estimate the fraction. This is the most accurate way to measure for diameter. Usually with a front wheel or the left side of rear wheel, you can go with a typical spacing of 35 mm, and with the right side of a rear wheel that has multiple sprockets, 20 mm. You could cut a C-shaped recess in a piece of cardboard, mark the spoke-hole spacing as shown in the photo at the left, and then measure it with a ruler. The spokes attach Spokes with a reinforced arc and the same diameter throughout are called single butted spokes, while those with a thinner mid-section are referred to as double butted spokes. Only the short spoke nipple at the right is really suitable for the spokes shown. Normally, these must match, though it is possible and sometimes useful to build a wheel with some mismatched combinations. eval(ez_write_tag([[468,60],'sheldonbrown_com-box-2','ezslot_2',136,'0','0'])); Please note Howard Sutherland's words of wisdom! Some of the measurements in this article use a tape measure divided in inches, and the article shows how to convert to millimeters. For example, if the left flange of the hub is 35 mm from the centerline, the right flange 20 mm from the centerline and the spoke holes in the rim are offset 3mm to the left, then the effective flange spacing is 32mm on the left and 23mm on the right. If measuring a built-up wheel with non-recessed spoke nipples, the cable will sit next to them and the measurement is that for a bare rim. Finally: If you measured over the tops of spoke nipples, you are done. (A wide metal tape measure won't fit into the well of most rims and won't curve smoothly around the rim.). Spoke length calculator software does the number crunching for you. If the two flanges are different distances from the centerline, measure them independently. The ends of the spokes of a fully-tensioned wheel come to somewhere between the bottom and top of the slots in the spoke nipples. Lay the ruler flat across the flanges of the rim. Warning! The right flange is 50mm to the left of the right locknut, and the left flange is at 100mm to the left of the right locknut. If the impeller pitches left, you will have to tension the spokes that pull to the right and vice versa. Spoke length is measured from the inside of the elbow, as shown in the image below, to the threaded end. Errors in measurement of the rim's diameter result in only half as great an error in spoke length. Hook in more spokes into each second flange hole in the hub as described in point 5. You don't need a caliper. etc. Brass spoke nipples are much stronger than aluminum ones and are more likely to survive this abuse. We generally distinguish between two spoking types: Radial and tangential. The circumference of the well measures as 64 1/8 inches, (64.125 inches). If you measured the circumference of the rim at the well, then measure the depth from the well to a recessed spoke hole, if the spoke holes are recessed. A spoke can be threaded in only until the red line in the picture reaches the bottom of the threading in the spoke nipple. A 36-spoke cross 4 pattern pattern is a good choice when the hub's dimensions aren't known or with flanges of different sizes. Clincher rims for wire jacket tires. Measure at three or four different angles spaced equally around the rim and take the average, in case the rim isn't perfectly round. First, let's measure from the right end. For typical wheels, random errors dominate, but for larger wheels, and particularly, very large wheels such as on antique high-wheeler bicycles, proportional errors -- from the scale of a measuring tape being slightly to large or small, and from spoke stretch under tension -- become important. The spokes are stresses only under tension and because of their intrinsic rigidity, they hardly change their shape at all. The crossed-out prices represent our previous price. Skip three holes and insert the next spoke in the fourth hole. Half that is 67.5mm. This type of spoking is recommended only for front wheels with rim brakes, because it is less suitable for absorbing forces from disc brakes or drive forces. The spoke threads are the same length in all three examples, but the spoke nipples are of different lengths. If you are already a Bergfreunde customer, you can log in here. A narrow, metal tape measure -- 1/4 inch or 6 mm wide -- will fit into the well of the rim (the deepest part of the rim's channel). The hub consists of an axle, bearing and hub housing and may also contain a brake or an overrunning clutch. With common wheels, errors in flange distance from the centerline are of minimal importance: a 1 mm change in flange distance results in only about a 1/10 mm change in spoke length. Spoking the other side of the impeller will create several large and small 'V'. Both differ from one type of sport to the next, but they all basically serve the same purpose. confirm your selected spoke lengths. Next, start hooking in spokes into the hub again from below. . Register an account and login to enable saving your wheels. Properly-tensioned spokes stretch by about 0.3%, and rims compress slightly -- so, the 250-300mm long spoke in a typical large bicycle wheel needs to be about 1mm shorter than raw calculations would indicate. Dimensions in blue and green are the flange spacings create your own database hub! And top of the measurements in millimeters the fraction dead ) correct.! Only works if they are aligned precisely different distances from the inside of the rim a. 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Check against this one and help confirm your selected spoke lengths for straight hubs... Survive this abuse 's how spoke length when building the wheel the fraction in length. Wood expand and contract with changes in temperature and humidity ; fabric also stretches times you 'll find in! Diameter, but they all basically serve the same length: if you are done,.

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