With the number of sprockets constantly increasing, you have less need to adapt your cassette to the field. However, it sometimes needs to be replaced, here’s how to do it.
You will need a chain whisk, a cassette disassembler adapted to the brand of your cassette, grease and a cloth, whether or not accompanied by a degreaser.
Pictures © Frédéric Iehl
Time and difficulty
It will take you between 10 and 20 minutes to complete the cassette swap. It will be the cleaning that will take the longest. If you mount a new cassette, in 5 minutes it should be done. And if you act in the right direction, it won’t be complicated at all. It will just be very messy! So choose the place where you will do the operation!
We start by removing the quick release. We can’t do anything if it’s in place!
The chain whip is placed in this direction and on the largest sprocket. Thus, if we have a whip provided for 9 speeds and the cassette is in 12, there is no risk!
The cassette remover is placed in the clamping compass opposite the chain whip and pushed jointly on both. The compass will move slowly.
It is best to completely unscrew the compass with the cassette tool. There is little grip because of the form and possible mud.
We will clean the cassette body and take the opportunity to notice that on this HG/Shimano body there is a wider furrow that serves to store the sprockets correctly.
The body is covered with grease. This limits its corrosion, but above all it makes it easier to remove the cassette afterwards.
It is also put on the thread of the clamping compass.
On the sprockets there is a wider notch that corresponds to that of the body. On the « spiders » no risk of making a mistake in the face, on the individual gables, yes. If the sprocket is poorly oriented, it will not fit on the body.
We stack sprockets blocks or spiders.
The « inter-sprocket » washers have no mounting direction. You just have to put them in the right place between 2 sprockets.
The terminal sprocket is one-eyed. It also has the wider notch, it must be aligned, but blindly…
When the last sprocket is in place, we make sure that it does not rotate relative to the others.
We screw the compass by hand. We must make sure that it is not wrong. The thread of the body can be damaged if forced.
We place the cassette disassembled on the compass and tighten in this direction. We’re going to feel a few blows before everything gets stuck.
We now grease the entrance to the axis on the opposite side and put the quick release back! It will be greased as it progresses. It’s over!