Hello Bikers!
turns out the other day I decided to change the rear shock of my Decathlon 9.1, an X-Fusion O2, for a brand new Fox RP2, which was also in ChainReaction offer for 111 euros, well, I order, wait a few days and finally when I am about to change I start to give face to face with all aghhh!. So after some research on topic I am going to comment that things need to know about rear shocks and mountain bike
Let's do a little review of basic concepts. What will I do with air springs and oil, because the spring does not control them all. The first thing to consider is that there are three key actions to be taken into account, we will enumerate and analyze each
1, Length between "eyes" of the shock. Is the distance between the center of each of the loops of the shock. The will measure from the center and not from the ends the shock, I'll explain in the next photo with FOX and a green stripe is very clear. The most common distances are usually 165mm, 190mm, 200mm and 216mm, although there are a few more.
2 The "race" or the actual distance the shock can travel or compressed. Tours are usually 38mm, 50mm and 63mm. Normally this trip is on the amount of "bar" visible, but it has not, ie, there may be a little more visible bar, for example in a bar FOX that I have seen is 53 mm, but the cushion covers only 50, the latter being 3 mm useless, I guess this is already a matter of design. I put a photo.
As imagine, manufacturers categorize their mixing dampers measures the length between eyes and the race so you're any shock of any brand you'll find listed in measures with values \u200b\u200balmost always similar to these, usually expressed in millimeters and inches, 152 x 31mm (6.0 x 1.25 "), 165 x 38mm (6.5x1.5"), 184 x 44mm (7.25 x 1.75 "), 190 x 50mm (7.5 x 2.0 "), 200 x 50 or 57mm (7875 x 2.0 or 2.25"), 216 x 63mm (8.5 x 2.5 "), etc.
Bien, llegados a este punto hay que hacer una aclaración muy importante, si quieres cambiar de amortiguador o comprar uno para un cuadro, debes comprar uno con las mismas medidas que el que llevas o el que admite el cuadro. Es muy importante utilizar las mismas medidas, luego veremos porqué, pero el motivo principal es que puedes dañar el cuadro, aunque como os digo luego lo analizamos.
3º Los espaciadores. Estos son unas piezas de aluminio que se meten a presión en cada lado de cada ojal del amortiguador, y son 4. En mi ignorancia pensé que utilizando los que ya tenía en la bici no habría problema, pero resulta que en esto también hay medidas y cosas a tener en cuenta, la primera is the diameter of the shaft with which you hit the cushion to the frame, this is usually 6mm or 8mm, and the second is the kind of space itself, and here if you have to be careful, because different manufacturers use different measures Manitou so, X-Fusion and Rock Shox has recently used the same size gear while FOX uses other measures differ in that on FOX on inside diameter of the shock eyelet is 15 mm, while the rest is 14, and the width is also different, this means that the adapters are specific. In case you dont know what pieces I mean if I put a picture sure you also identify the photo shows you the different types of measures to keep in mind when you know you need spacers.
Oh, one final note, in addition to data on manufacturers must take into account the spacer kits requested in two sizes, the total width between extremes, and the diameter of the shaft or screw in My bike needed four such spacers 24x8 FOX, I put a picture that much better understood.
Therefore, if you see a good price shock, always keep in mind the actions of these spacers to whether you that you are worth, and always ask the seller.
Finally there is a temptation to be resisted, and as you pointed out something before, and is buying a shock with more travel to increase the bike path, well, this is something that can not be done, because if you increase the buffer size, first you might not even fit in the box, and the second is that although you can fit the rear swing arm hit the table to have more travel, so you never put a damper more race because anything can end up cascade, if you want more travel is your turn to change the picture or change the bike, no more.
Well, I hope this will serve to liéis not like me, eventually I fabricated a device with a needle roller and some washers to create my own space, but that's another story that I will discuss in a little article
Greetings bikers and the ways we are!
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