so much confusion and fear in the infinitely important to look at the great little invention that changed history.
the WHEEL : the basic concept of the wheel is that at one point, only one, of contact with the ground, the relative velocity is zero. is nothing if the wheel is slipping [skid in English]: sliding can be intentional or unintentional and must always be checked-in and normal use of the medium-biased.
the WHEEL BICYCLE : how to write the great Sheldon Brown , competition and rivalry between nations, established brands have an infinite number of ways of identifying the measures of the components that make up this fantastic object / mechanism .
the wheel of the bike is made up of four main components:
- the hub through which the axis that passes through it contains the actual rotation mechanism
- the rays cross in different ways and with different lengths bind to the hub to the rim
- the rim, commonly around the circle, and in aluminum, steel or wooden handles to make the shape "round" to the wheel and is covered with the upcoming "system of contact with the ground"
- the contact with the ground through a system: the more 'common room is air + clincher, but history also saw wheels plastic or other solid, tubeless tire or tubular palmer mostly used in the past in the race bike for their smoothness.
the basis for characterizing a wheel is diameter of the rim.
mainly speak in the jargon of "wheels" of 28, 26 or by mountain bike.
unfortunately it 's not so' simple: we must bear in mind the different classifications [almost unit] that will recognize the rim in question and possibly replace it with an equivalent or nearly so.
The famous "wheel 28" and features a rim or other methods of measurement is called "700" or as the unit of measurement currently ISO * defendant as universal and official ETRTO " 622 ".
quite a bit 'confusing for those who are beginners:) especially considering that for several years, motivated by the unfair competition many acronyms purposely misspelled word mark with overbuilding smaller circles to win the battle of weight.
PROBLEM # 1:
I have a old bike with the rim like I do wrong?
if the "flaw" is significant and / or rim is compromised, cracked or otherwise does not straighten the tension of the spokes it only remains to replace the rim.
the problem is finding a compatible circle its wheel impaired by years in the cellar, rust, paving killer, accidents, motorists assholes that park up.
First step is to find the references of the tire, or whatever.
Yes, the tire: on it are always written to the data which will be mounted on the rim.
acronyms must look like this:
650 x 28 (typical for a bike tire walking "a woman")
622 x 32 (one way to call a tire 'a bit off "Wheel 28)
622 x 23 (typical tire racing)
C or 700 x 23 x 23 700C (equivalent to the previous year)
26 x 1.75 which is not compatible with 26 x 1 3 / 4 anceh if you are mathematically equivalent.
E 'and therefore required careful precesione in record data.
Another step is to seek confirmation in some screen printing or label on the rim: steel rims in the past reported all its measure.
Without these two simple steps, if measures the same, you are ready to begin research in the shops or Ciclofficina popular.
The question is natural, "and you had to write you?"
response as: "Some people is not practical about these things and you could lose in a glass of water unnecessarily spending or giving up a priori, really."
PROBLEM # 2:
I have a old bike with the wrong tire, I found a how do to replace it?
technique passed down through the sly ever said that if the circle "new" is identical to the "old" can be replaced without having to know the techniques of junction of the rays:
> as a first step just to get a box with elasticini which will bind in pairs rays intersections so that will not melt at the most awkward-tape of any kind would be fine anyway-
> alongside the circle "new" to the "old" taking care to support each other the two holes for the valves and secure them together
> special tool called a spoke wrench with * * [ o giraraggi o coso per i raggi o fatt'apposta ] svitare dal cerchio vecchio i " cosini " alla fine del raggio fino al completo distacco, inoltre conviene scegliere coppie di cosini da svitare corrispondenti a coppie di raggi legati fra loro.
> riavvitare i cosini sui raggi, ma attraverso i fori del nuovo cerchio.
> con l'ausilio del tiraraggi tensionare tutti i raggi in modo uniforme, prima, e in modo da rendere il cerchio "rotondo", dopo..
> finito!
la ruota creata/clonata should allow re-use the bike relatively quickly whether or not insured "performance competition" should work.
* International Organization for Standardization
* * the spoke wrench can be purchased for a few euro in hypermarkets, is comfortably accommodates use one type multi-measurement, usually round, since it is not ruled out the need to use different measures: the most common are the No. 14 and No. 15.
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