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Felge und Nabe messen, um Speichenlängen zu berechnen: Unterschied zwischen den Versionen
Felge und Nabe messen, um Speichenlängen zu berechnen (Quelltext anzeigen)
Version vom 21. Februar 2022, 08:38 Uhr
, 21. Februar 2022→Die Tiefe bis zu den Speichenlöchern: Bilder hinzu
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(→Die Tiefe bis zu den Speichenlöchern: Bilder hinzu) |
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You must measure the depth to the spoke holes if they are recessed, or if you measured the outside diameter of the rim. | You must measure the depth to the spoke holes if they are recessed, or if you measured the outside diameter of the rim. | ||
You can use an improvised tool, as in the image at the right -- a bolt and nut, and a small metal ruler. Lay the ruler flat across the flanges of the rim. | You can use an improvised tool, as in the image at the right -- a bolt and nut, and a small metal ruler. Lay the ruler flat across the flanges of the rim. [[Datei:Bolt-meas-sm.jpg|right|Messen der Tiefe eines eingelassenen Speichenlochs mit Schraube und Mutter]]Insert the bolt. If the rim has recessed spoke holes, the bolt will extend to the bottom of an eyelet. Screw down the nut until it rests against the ruler. Then use the ruler to measure the length between the nut and the end of the bolt. Subtract the thickness of the ruler (here, about 0.5 mm). Again, if your ruler only measures in inches, you need to convert to millimeters. | ||
[[Datei:Rim-spoke-sm.jpg|left|Messen der Tiefe eines eingelassenen Speichenlochs]]To avoid having to remove the rim tape of a built-up wheel, you may measure at the inside of the valve hole, as long as you can see that the spokes rest at the same diameter. | |||
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. | 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. | ||
If you are good at holding objects steady in your hands, you can even do the depth measurement with a bare bolt or bicycle spoke, as shown in the image at the left. Insert the spoke to the bottom of the spoke-hole recess, and slide your hand down the spoke until the fingernail of your index finger rests lightly against the side of the access hole. | If you are good at holding objects steady in your hands, you can even do the depth measurement with a bare bolt or bicycle spoke, as shown in the image at the left. Insert the spoke to the bottom of the spoke-hole recess, and slide your hand down the spoke until the fingernail of your index finger rests lightly against the side of the access hole.[[Datei:Spoke-meas-sm.jpg|right|Übertragen der Messung von der Daumennagelspitze auf ein Lineal]] | ||
Then as shown in the image at the right, transfer this measurement to the ruler, resting your fingernail lightly against its end. | Then as shown in the image at the right, transfer this measurement to the ruler, resting your fingernail lightly against its end. | ||
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. Spoke calculators use the diameter, which is twice the radius, because there's nothing to measure at the center of an empty rim. So, as you move on to final calculations, you'll be subtracting twice the depth you measured with the bolt or spoke. | 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. Spoke calculators use the diameter, which is twice the radius, because there's nothing to measure at the center of an empty rim. So, as you move on to final calculations, you'll be subtracting twice the depth you measured with the bolt or spoke. | ||
===Berechnung des Einspeichdurchmessers=== | ===Berechnung des Einspeichdurchmessers=== | ||