C = \/A2 + B2 - 2AB cos θ. We have an article about that. Subtract this number from the rim half-width. NOTE: These sizes have nothing to do with spoke wrench sizes. An example is shown below, using the same hub. It is a very simple thing to do. 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). Spoke lengths are given in millimeters, so you need to come up with measurements in millimeters. To do this, just change the left and right flange offsets by the rim offset. Why does a blocking 1/1 creature with double strike kill a 3/2 creature? With a 36-spoke cross 4 pattern, the spoke holes are 90 degrees away from those in the rim, and the hub spoke hole circle diameter hardly matters at all. You can use an improvised tool, as in the image at the right -- a bolt and nut, and a small metal ruler. Returns 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. With a radial spoking pattern, spoke length changes at half the rate of the diameter of the hub flange.

If you are trying to find nipples for spokes, there are two widths: To check which size your spokes are, try to thread one into a 1.8mm nipple. If you are working with an empty rim, it is easy to measure the outside diameter, but if you need to measure a built-up wheel, the axle gets in the way of the tape measure. It is usually between 38 and 67 millimeters. Could evaporation of a liquid into a gas be thought of as dissolving the liquid in a gas? Shipping Times rev 2020.11.4.37942, The best answers are voted up and rise to the top, Bicycles Stack Exchange works best with JavaScript enabled, Start here for a quick overview of the site, Detailed answers to any questions you might have, Discuss the workings and policies of this site, Learn more about Stack Overflow the company, Learn more about hiring developers or posting ads with us. C (in red) is the third side, the one you calculate. Half that is 67.5mm. A double-wall rim has recessed spoke holes: the smaller holes closer to the center of the wheel hold the spokes. A hub flange farther from the centerline requires longer spokes, but only slightly longer with most wheels because the spokes approach the hub at a high angle. (adsbygoogle = window.adsbygoogle || []).push({}); Please note Howard Sutherland's words of wisdom! Writing letter of recommendation for someone I have never met.

The first step creates a virtual measuring point directly below the spoke holes in the rim. But it need not be confusing, in fact for most people it is quite simple. Calculating now, the overlocknut distance is 135mm, as in the manufacturer's specification in the drawing above. If the spokes extend into the screwdriver slots when the wheel is under light tension, you can't use a screwdriver for initial light tensioning of the wheel. Subtract the thickness of the ruler (here, about 0.5 mm). The spokes attach If you are measuring with a standard ruler measure from the center of the J bend to the end of the spoke. By using our site, you acknowledge that you have read and understand our Cookie Policy, Privacy Policy, and our Terms of Service. Here you will see the size tyre you are using ("diameter" x "width"). Also, measuring in two different ways is possible, and a good idea. 15 Gauge spokes are 1.8MM or .070" 14 Gauge spokes are 2.0 MM or .078" A 15 Gauge nipple will not start on a 14 Gauge spoke but a 14 Gauge nipple may thread onto a 15 Gauge spoke but it will feel really loose, or it may just slip over the thread. I thank Roger Musson for permission to use the photo below, with cross-sectioned spoke nipples.         _________________ Both ends of the hub are measured. 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. Always count to make sure you use spoke holes that are actually opposite each other! Subtract this number from the rim half-width. You must measure the depth to the spoke holes if they are recessed, or if you measured the outside diameter of the rim. Measuring spokes is a process made easy by a ruler designed for the purpose. Depends on how well the spoke thread was swaged and the tolerances of the nipple. The spoke hole diameter (S) also affects spoke length. They are very near the generic ones already given.

Unless you are already measuring over the tops of the spoke nipples in a built-up wheel, add twice the height of a spoke nipple (typically, 2mm for each spoke nipple, and so 4mm total). What are the pros and cons of Double Butted vs Straight Spokes when building a wheel? In case you were sleeping in 6th-grade math class: π is a a Greek letter denoting the ratio of the circumference of any circle to its diameter. 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, nor for any decisions taken based upon those results. Reviews and Testimonials, Positz Performance Road Bike Value Bundle of 1 Tyre and 1 Tube – 700 x 25c, Hilly Men's Twin Skin Socklet Socks - Azurite/Grey, Hilly Men's Twin Skin Socklet Socks - White/Grey, Hilly Men's Lite Anklet Socks - White/Grey, Possible New Australian Bicycle Helmet Standards. The thin barrel of a conventional bicycle hub cannot withstand the torque of pedaling, or of a hub brake. Some spoke calculators, including Damon Rinard's Spocalc on this site, perform only the mathematical calculation described earlier in this article.

Insert the bolt. Online information is, to be sure, useful in identifying parts and in confirming your measurements. Quoting Wikipedia - "Additional terms may apply". You don't need a caliper. The illustration below shows the outside diameter and the spoking diameter. etc. Measure against a broken or existing spoke and because this is cycling there is a special tool for it - the spoke ruler! Slide one end of the tape back and forth along the rim until the measurement is largest. This is the rim half-width. Now you need calculate the spoking diameter. at the deeper, smaller holes in this double-wall rim. They are anodized blue and have special holes on them for hooking and measuring spokes. Lay a measuring tape or ruler across the rim between two points directly opposite one another. Get out your pocket calculator or smartphone app (or a paper and pencil if you're retro or the battery is dead). With both wheels spoked this way, a bicycle tourist would need to carry only one length of spare spokes, despite different flange sizes on the front and rear hub, etc.

We'll have another page for them soon! If a spoke does not extend into the head of the spoke nipple, then the weakest part of the spoke nipple is in tension and the nipple is at risk of breaking. Count holes to be sure. Nothing here is guaranteed correct or complete, so use at your own risk and try not to delete the Internet. Howard Sutherland demonstrates the Rim Diameter System in the video below: To determine spoke length, you also need measurements of the hub: the diameter of the circle of spoke holes, the diameter of a spoke hole, and the flange spacing from the centerline.

Multiplying that number by 25.4 to convert to millimeters and lopping off meaningless decimal places gives 290.9mm. Cross section showing rim outside diameter The other way is to take the whole wheel, and measure the length it needs. Spoke Length and Gauge. I recommend doing both. Is it really necessary to physically cross (interlace) the spokes on traditional wheel lacing? How is the AP calling Virginia in favor of Biden even though he's behind on the vote count? You can use a hub listed in Edd's database, or measure your own hub by following these steps: Not a lot of precision is needed in the width dimensions. The Sutherland system includes a tool to find the effective rim diameter for spoking. Do this at several spots around the rim and average the measurements. If the hub is very large, as with many electrically-assisted bicycle hub motors, that article will show how to reduce spoke angle at the rim and avoid spoke breakage. Measure the distance from the near sidewall to the center of the average spoke hole (L). C is the result of the previous formula, as shown by the red line in the image at the right, w is the spacing of the spoking flange from the centerline, as shown by the blue or green line in the image, and. Measure its nipple width (the bit it screws in to). I have a hybrid bike and under description for Spokes it says "Stainless PG"...but when I look for spokes there are a multitude of sizes, thicknesses, butted, double-butted, etc.! Convert the fraction after the last even inch to a decimal before multiplying: for example, 1/4" is 0.250, so a rim that measures 24 1/4 inches is 24.250 inches in diameter, or rounded to the nearest 1/10 millimeter, 616.0 mm. You can measure the circumference of a rim by wrapping a measuring tape all the way around the rim.

Resting the locknut against the edge of a workbench or table makes measurement easier. Making statements based on opinion; back them up with references or personal experience. Note that it is NOT the outside diameter of the hub's flange.

The question “how to measure bicycle spokes size correctly” is something we get asked every now and again. You need to know the number of spoke holes of the rim and hub. The first way is the more accurate. After entering your hub data into Edd's manual hub entry form ("Enter your own measurements"). 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. On paper, take your calculation out to tenths of a millimeter or hundredths of an inch.. What's wrong with the "airline marginal cost pricing" argument? Anyway, I wrote these notes so I don’t have to do all the research again when I forget it! I don't know enough about Excel to make Spocalc smart enough to compensate for rim offset, but I have two work-arounds: the easy way and the exact way. Subtracting the smaller from the larger measurement and dividing by two would also give you the diameter of the spoke holes -- but that is usually 2.5 to 3 mm, and the resulting difference in spoke length isn't large enough to matter. THANK YOU FOR SUPPORTING OUR SMALL MELBOURNE BUSINESS . Subtract rim offset from the centre-to-left width. Comparing the leftmost spoke with the bare one shows that the internal threads of the nipple extend down about as far as the base of the wrench flats. S, spoke hole diameter, is the through diameter of any spoke hole.

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