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.
Get the latest mountain bike reviews, news, race results, and much more by signing up for the MTBR Newsletter. Hub diameter gear side: mm. We'll have another page for them soon! Now you need calculate the spoking diameter. Twice that is 22 mm, and so the spoking diameter measures as 508.2 mm. 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. The next spoke nipple is threaded on until the end of the spoke is level with the top of the nipple's screwdriver slot, as far as it can go without risk to the inner tube. DT Swiss Straight Pull Aerolite Spokes - 292mm DT Swiss Pro-lock brass 12mm nipples I came across a post a while back (forget what forum) that had spoke length factors to be applied based on regular Hope hub spoke length calcs. If both flanges are the same distance from the centerline, measure the spacing between the flanges and divide by two. International Shipping This is possible because straight-pull spokes can be tightened to higher tensions than J-bend spokes. FAQ: Can I calculate straight pull hubs on your spoke calculator? Then subtract the offset of the spoke holes from the hub flange spacing of the same side as the offset, and add it to the hub flange spacing for the other side. We'll calculate our spoking diameter using both of our sets of measurements, and see how the results compare. Multiplying by 25.4 gives 530.2 mm. Measuring tire deflection vs measuring psi's...a better way? This is the ultimate in custom wheel configuration. Ï is a single-button function on scientific calculators, carried out to a large number of decimal places, but 3.142 is close enough if you have a four-function calculator or are working on paper. Next, find the corresponding size tyre on our website.
The question “how to measure bicycle spokes size correctly” is something we get asked every now and again. So if you are going to use a manufactures ERD subtract 4mm. Get out your pocket calculator or smartphone app (or a paper and pencil if you're retro or the battery is dead). For assistance with other calculations or custom wheel questions, email It's a problem in trigonometry, in two steps. 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.
This is possible because straight-pull spokes can be tightened to higher tensions than J-bend spokes. I thank Roger Musson for permission to use the photo below, with cross-sectioned spoke nipples. The angle θ depends on the number of spoke holes and the spoking pattern. With 1497 hubs and rims in the database, you can quickly select your chosen parts or enter your own Measuring spoke length for straight pull hub So I picked up a pair of Novatec Straight Pull Road Disc Hubs.
This article describes how to measure, with an emphasis on the use of simple, low-cost tools, and describes the level of accuracy needed.
etc. The main one is, you can now add images to new and current hubs and rims within the database. They're going on a rim with an ERD of 567mm and nothing special about it (no asymmetry or offset or anything like that) just a standard rim. Also, some hubs and rims have unevenly-spaced spoke holes, but we're not going to discuss them here.
I recommend doing both. So, as you move on to final calculations, you'll be subtracting twice the depth you measured with the bolt or spoke. The below diagram gives the correct way to measure your spokes.
In case you were sleeping in 6th-grade math class: Ï is a a Greek letter denoting the ratio of the circumference of any circle to its diameter. If you measured an empty rim, add twice the height of a spoke nipple -- about 4mm total. Shipping Times Though you should always measure carefully, wheel measurement is more forgiving than you might think. The question “how to measure bicycle spokes size correctly” is something we get asked every now and again. Hours: Monday - Friday 10 to 5pm EST Questions? At the moment please do not use these as the spoke length will be incorrect.
Check your current tyre sidewall. (Spoke tension will make the rim round later, unless the rim is really bad. This measurement should agree with the one according to Damon Rinard's method (see below). It's more to do with intolerance between published and real world measurements. The two known sides (A and B) are the radius (half diameter) of the circle of spoke holes in the hub flange, and the radius of the circle of spoke holes of the rim. 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. Hub diameter non-gear side: mm. Information will open in a new tab. The measured outside diameter of our rim is 20 7/8 inches, or 20.875 inches. Spoke Length Calculations - Compensation for Spoke Stretch & Spoke Hole Stagger?
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.
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