How To Change Chainrings – Changing Your Chain Rings For Road Or Mountain Bikes

How To Change Chainrings – Changing Your Chain Rings For Road Or Mountain Bikes


Why would you want to replace your chainrings?
Well it might be that you’re upgrading them, changing the size, or you might want to experiment
with some Osymetric or Rotor rings on the road. If you’re a mountain biker it might
be that you’ve hit them and they’re slightly warped, or for any chainring it might that
if you’ve used them a lot over time, they are starting to get worn. You can tell that
if the teeth are all starting to get low, although do bear in mind that a couple of
teeth, even when new, are quite low because that aids the shifting from one chainring
to the other. So in this video we’re going to show you how
to change the chainrings. For the majority of chainsets, all you need for the job is
a 5mm allen key and one of these specialist tools, which you put on the back of the chainring
bolts to prevent them from slipping when you’re both loosening and tightening them. Although
for some modern chainsets – modern Shimano ones and also some Campagnolo chainsets, they
are using these torx bolts, which are a slightly more star fangled thing and that reduces the
chances of them being rounded off as you loosen and tighten them. We’re going to start with a fairly standard
Shimano mountain bike chainset. However, if you’ve got a modern Shimano chainset like
this one, please click here. With this one we need to start with the inside
ring, because the teeth of that partly cover the backside of the outer chainring bolts. Undo each bolt a little at a time using your
5mm allen key. You can do the last bit by hand, putting the bolts safely to one side.
Once you’ve taken the last one off, the chainring should come away from the cranks. Make a note
of which way around the chainring was mounted. For this one we need to use our special tool
to prevent the bolt on the other side from moving. Again, undo each outer bolt a little
at a time. On this particular crankset, there are also some crank arm tabs which you will
need to keep safe. After all the bolts are removed, the chainring will come away from
the cranks. Before you replace your chainrings, clean
each of the bolts using some degreaser and then apply some fresh anti-seize paste. To replace your chainrings, start with the
outer one. Marry it up to the holes in the crank spider. There is often a small tab on
the outer chainring, which needs to go in line with the crank arm. This prevents the
chain falling between the ring and the crank. Then put one of the chainring bolts in, doing
it up by hand. Then do the same with the opposing bolt, and then the remainder. Next, use your chainring bolt tool to hold
the back side of it still, and tighten the other side using your allen key. Repeat this
for each of the other bolts and then finally go over them all again to make sure they are
tight. Next, we can put the inner ring on. Generally,
any writing on the chainring should be facing you as you put it on. This will make sure
that you have the ring on the right way round. If you don’t have any writing, try looking
at the teeth of the chainring. One side of each tooth should be steep sided, and the
other a little more slanted. It should be the steep side that pushes against the links
of the chain as you are pedalling forwards. Put the bolts back on and tighten each a little
at a time, going round again at the end just to make sure they are all tight. Here, we’ve got a 2012 Ultegra chainset which
uses the torx-style bolts. To remove the chainrings on this, all we need to do is loosen the five
bolts. As ever, undo each a little at a time until you can take them off by hand. Once
the last one is out you will be able to remove both the inner and outer chainrings. Before
you replace or renew them, clean the bolts using degreaser and then apply a small amount
of anti-seize paste. To put the outer ring on, pull the crank arm through it, and make
sure the tab on the chainring is sitting behind the crank itself. Then put the inner ring on, making sure that
any writing is facing you as you do it. Start one of the bolts by hand and then do the same
with the remaining ones. Then start tightening them properly using you torx tool. Rather
than going around the chainring, tighten opposing bolts a little at a time, and once they feel
tight, go around them one final time just to make sure. Then you are ready to replace your cranks.