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Kunstgriffe beim Messen: Unterschied zwischen den Versionen

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Precise measurements are often needed so bicycle parts will assemble correctly. It is usual to perform many of these measurements with special tools which you aren't going to carry around in your on-road toolkit. Also, some of these tools have only a single use, and they can be rather expensive.
Präzises Messen ist oft notwendig, wenn man sicher stellen möchte, dass Fahrradteile zueinander passen. Normalerweise werden solche Messungen mit speziellen Messinstrumenten durchgeführt, die man nicht unterwegs mit sich herum trägt. Meistens haben diese Instrumenete genau einen Einsatzzweck und sich vergleichsweise teuer.


Certainly, you should have a tape measure for large-scale measurements -- frame height, rim diameter, wheel roll-out. A ruler is more convenient for many measurements. Neither of these, though, has the precision needed when checking many bicycle components for compatibility.
Sichlich sollte man ein Maßband für größere Messungen besitzen, um [[Rahmen]]höhe, [[Felge]]ndurchmesser oder [[Abrollumfang]] messen zu können. Ein Lineal ist für viele Messungen ausreichend. Jedoch hat keines dieser Messinstrumente die Genauigkeit, die notwendig ist, um Fahrradkomponenten auf Kompatibilität zu prüfen.


To understand the challenge, let's first look at some measuring tools you wouldn't be carrying around in your on-road toolkit, or might not own at all if you are a home mechanic. The good news though is that common tools or parts of the bicycle itself can often perform the needed measurements. Often, too, trick measurement techniques are timesavers. This article describes a number of such techniques. At the end of the article is a list of links to other articles with information about measurements.
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==Exaktes Messen==
==Messschieber==
Um die Aufgabe besser zu erstehen, schauen wir uns zuerst ein paar Messinstrumente an, die man normalerweise nicht mit sich führt und die man auch nicht in der heimischen Werkstatt hat, falls man Heimwerker ist. Die gute Nachricht ist, dass man oft gängiges Werkzeug oder Fahrradteile selbst benutzen kann, um die notwendigen Maße zu nehmen. Oft kann man zu Kunstgriffen greifen, um Zeit zu sparen. In diesem Artikel werden einige dieser Techniken  erläutert. Am Ende des Artikels folgt eine Liste mit anderen Artikeln, die sich im weitesten Sinne mit Messungen beschäftigen.
 
===Messschieber===


This is very versatile and very precise, for internal, external and depth measurements. The most useful kind has a digital readout, which can be set to inch or metric at the push of a button. You wouldn't normally carry this tool on the bicycle, even in its protective case; but there are other ways to do most of the measurements it might perform on a bicycle.
This is very versatile and very precise, for internal, external and depth measurements. The most useful kind has a digital readout, which can be set to inch or metric at the push of a button. You wouldn't normally carry this tool on the bicycle, even in its protective case; but there are other ways to do most of the measurements it might perform on a bicycle.


digital caliper
digital caliper
==Gewindelehre==
===Gewindelehre===


This tool with saw-toothed feelers is important for a machinist or auto mechanic, but much more versatile than needed for bicycle use, and so, more expensive. The example in the image has an upper and lower bay. The feelers in one bay are metric and in the other, inch-size. Bicycles use both metric and inch-sized threads, but in only a few sizes. This article will show how to use bicycle parts themselves to check each other's thread pitch.
This tool with saw-toothed feelers is important for a machinist or auto mechanic, but much more versatile than needed for bicycle use, and so, more expensive. The example in the image has an upper and lower bay. The feelers in one bay are metric and in the other, inch-size. Bicycles use both metric and inch-sized threads, but in only a few sizes. This article will show how to use bicycle parts themselves to check each other's thread pitch.


Thread pitch gauge
Thread pitch gauge
==Messwerkzeug von Stein zum bestimmen des Innendurchmesdsers von Sattelrohren==
===Messwerkzeug von Stein zum bestimmen des Innendurchmessers von Sattelrohren===


The inside diameter of most bicycle components where precise fit is needed is standardized, with only a few variations. With the seat tube, on the other hand, the outside diameter is standardized, but the inside diameter is not.
The inside diameter of most bicycle components where precise fit is needed is standardized, with only a few variations. With the seat tube, on the other hand, the outside diameter is standardized, but the inside diameter is not.
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