If you're a real stickler, you could insert the outside-measuring blades of the caliper into the spoke holes to take a smaller measurement, and the inside-measuring blades (at the top in the picture) to do a larger measurement, then take the average. the difference of having the right length spokes or not!
Measure a diameter of the rim, or calculate the diameter based on a circumference. To find the correct spoke length when building a wheel, you need dimensions of the rim and hub. So, we got 508.2 mm by measuring the diameter and 508.5 mm by measuring the circumference. There are 93 hub manufactures in the database with a total of 894 hubs to choose from. Both ends of the hub are measured. Measurements for Spoke Length Calculations, Roger Musson -- wheelbuilding book, spoke calculator. You don't have to know the formula for spoke length. A double-wall rim has recessed spoke holes: the smaller holes closer to the center of the wheel hold the spokes. Spoke length calculator software does the number crunching for you. Be advised, you may find hubs which use straight pull spokes.
Answer: This is the way I learned. Unimportant because spoke hole clearance is small. The second step gives the spoke length, by accounting for the spacing of the hub flange away from the centerline. A spoke can be threaded in only until the red line in the picture reaches the bottom of the threading in the spoke nipple. 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 dimension you measured using the bolt or spoke is a difference in the radius --the distance from the center of the wheel to the outside. Errors in measurement of the rim's diameter result in only half as great an error in spoke length. Total length of the hub: mm. Multiplying that number by 25.4 to convert to millimeters and lopping off meaningless decimal places gives 290.9mm. The spoke threads are the same length in all three examples, but the spoke nipples are of different lengths.
The fabric stretches. and spoking diameter. The final measurements you need to calculate spoke length are. Post by Rumsas on Wed Aug 22, 2012 6:36 pm. That same number will not work for other straight pull … Answer: Always use the full number not the half. Non-gear side: mm. You can measure the circumference of a rim by wrapping a measuring tape all the way around the rim. Spoke length calculators are online or downloadable. These measurements are not an exact match for the manufacturer's specifications, but are close enough for all practical purposes. You need this information to do your calculation, and to make a correction for the next wheel, if the spoke length turns out slightly incorrect with your first one. Terms and Conditions The new Spoke Calc program will account for the proper ERD standard. That same number will not work for other straight pull hubs. Damon Rinard has another description of hub measurements on this site. Spoke Calculator does not calculate length for straight pull spokes. Front Wheel Front Wheel with disc Rear Wheel Rear Wheel with disc. etc. This tool allows you, as a professional wheelbuilder, to quickly and easily calculate the weight and correct spoke length for your wheel. If you measured an empty rim, add twice the height of a spoke nipple -- about 4mm total. JavaScript seems to be disabled in your browser. Don't trust a fabric measuring tape as used in fitting clothing. This allows our program to make recomendations such as rims, hubs, spokes and nipples. _________________ Longer threads prevent a spoke with short threads from screwing in all the way, so check for compatibility. Get the latest mountain bike reviews, news, race results, and much more by signing up for the MTBR Newsletter. Spoke lengths are given in millimeters, so you need to come up with measurements in millimeters. This first warning that the spokes are too long comes after you have laced the wheel. You must have JavaScript enabled in your browser to utilize the functionality of this website. Multiplying by 25.4 converts to 1629 mm; then dividing by pi, the diameter at the well is 518.5mm. DT Aerolite Straight Pull spoke in an Easton Haven rim. Spokes will be effectively about 1mm longer when tensioned. So in this case 32 hole. Answer: Yes it can however it requires some additional steps. We'll calculate our spoking diameter using both of our sets of measurements, and see how the results compare. The Spoke Calculator is very accurate and easy to use. The rightmost nipple is threaded on only far enough to conceal the threads of the spoke, risking nipple breakage. You must measure the depth to the spoke holes if they are recessed, or if you measured the outside diameter of the rim. So if you are going to use a manufactures ERD subtract 4mm. So, measure, even if you think you know the correct dimensions. Free Shipping Offer Beyond that limit, it will bind. Calculating now, the overlocknut distance is 135mm, as in the manufacturer's specification in the drawing above. Newsletter When taking measurements, record the following information. The circumference of the well measures as 64 1/8 inches, (64.125 inches). Only the short spoke nipple at the right is really suitable for the spokes shown. There's nothing to measure directly there, and that's why a second step is needed. Here are the steps to measure a rim using the circumference: If you don't have a narrow tape measure, you could wrap a bicycle cable inner wire around the rim, hooking the ferrule into the valve hole. Resting the locknut against the edge of a workbench or table makes measurement easier. Measure at three or four different angles spaced equally around the rim and take the average, in case the rim isn't perfectly round. I was able to use 2.65 for the 2X pattern on the drive side of the Zipp 188 straight pull hubs. It's more to do with intolerance between published and real world measurements. 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. We have an article about that. Mr Cycling World, your favourite online bike shop is a good place to start!
But it need not be confusing, in fact for most people it is quite simple. 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. Screw down the nut until it rests against the ruler. © Copyright 2020 VerticalScope Inc. All rights reserved. Also, some hubs and rims have unevenly-spaced spoke holes, but we're not going to discuss them here. 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. Next, find the corresponding size tyre on our website. See the. Measuring tire deflection vs measuring psi's...a better way? The drawing below is of the same hub shown in the previous two photos (a SRAM DualDrive hub, a 3-speed with a cassette body for hybrid gearing). 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. . 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. Deriving the diameter from the circumference improves accuracy further by more than 3 times. 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). Divide the circumference by Ï ("pi" in English, pronounced "pie") to get the diameter of the well. Measuring spoke length for straight pull hub. Another point worth mentioning is that as a general rule a 1-2mm tolerance in spoke length is acceptable and rarely effects the build of the wheel. Some rims have spoke holes closer to one side than the other, to reduce dishing when the hub has unequal flange spacing. 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.
Next, find the corresponding size tube on our website. 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.
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