A key part of your bike’s drivetrain, your chainrings can turn into worn over time. They’ll begin to appear to be shark fins and also you’ll discover put on in the wrong way of chain journey.
With excessive put on, your chain can slip from one ring to a different or you could expertise “chain suck,” the place the chain doesn’t launch correctly from the tooth on the chainrings, and the chain can get jammed.
These are all indicators that it’s time to interchange the chainrings.
Relying in your setup, you could or might not must take away your entire crank to take away your chainrings. This text focuses on tips on how to change your chainrings if you are able to do so with out eradicating the crank.
Store REI’s collection of bike chainrings.
Video: Methods to Substitute a Chainring
Instruments and Elements for Altering Chainrings
Figuring out your chainring sort: Shopping for new chainrings and altering them out could be difficult. Chainrings have quite a lot of bolt patterns relying on when you have a conventional or compact drivetrain, and should you’re shopping for for a highway or mountain bike.
Some “direct mount” chainrings don’t have any exterior bolts; as an alternative, the chainring mounts on to the crankarm and is held on by a kind of lockring. Some bikes may even have chainrings which might be built-in with the crankarm, and you will want to interchange your entire unit.
When changing your chainrings, what you purchase will probably be decided by what number of bolts connect your chainrings to your bike, mixed with a mathematical equation primarily based on a measurement referred to as the bolt circle diameter (BCD). Have your bike mechanic enable you to decide your BCD so you possibly can select the right elements.
Instruments: A number of bolts are used to safe your bike’s chainrings to the crankset, and completely different nut/bolt combos would require completely different instruments.
You’ll nearly all the time want a chainring nut wrench, which is suitable with a kind of bolt that has a slotted channel working via the middle of the nut, referred to as a chainring nut. Additionally, you will want both a hex (Allen) wrench or a torx wrench.
Eradicating Bike Chainrings
First determine the right wrenches (chainring nut wrench, hex or torx wrench) suitable with the chainring nut on the surface of the chainring and the bolt on the again aspect. As soon as your wrenches are in place, flip the nut on the entrance to loosen it whereas maintaining the bolt within the again secured in place. As soon as totally eliminated, save the nuts and bolts to make use of together with your new chainrings. Subsequent, slip the chainrings over your crankarm.
(In case you discover which you can’t do that step, you’ll must take away your entire crank which requires further instruments and methods not lined on this article.)
Putting in Bike Chainrings
To put in new chainrings, you basically reverse the removing course of, beginning with the most important ring.
Slide the chainring over your crankarm. The chainring model title ought to be going through out (away from the bike) in order that the ramped edges of the chainring are going through in (towards the bike). (The “ramps” assist information your chain when shifting to the following chainring.)
Giant chainrings normally have a pin or tab designed to stop your chain from jamming between the chainring and crankarm. Place the chainring in order that the pin is protruding away from the physique of the bike and sits behind the crankarm.
Apply grease to the bolts, then substitute the bolts and nuts with the identical instruments you used to take away them, however don’t tighten all of them the best way. As soon as all bolts and nuts are put in, tighten every bolt 1 / 4 flip, shifting across the ring till all are tight. Then verify every with a torque wrench, tightening to the producer’s advice.
Place your chain again on a chainring and pedal the bike together with your hand to verify every part works correctly. In case you’ve modified the dimensions of your outer chainring, you could want to regulate the peak of your entrance derailleur.
Store REI’s collection of bike chainrings.
Bike Chainring Upkeep
Relying on how a lot you trip, you could need to completely clear your chainrings at the very least a pair instances per yr. See our article, Methods to Clear a Bike, for extra data.
In case you reside close to the seashore the place sand can get into your drivetrain or should you reside in a moist atmosphere the place rain routinely flushes away your chain lube, making your chain rusty, preserve a more in-depth eye on the situation of your total drivetrain.
Changing your chain proactively can typically postpone the necessity to substitute your chainrings, so make sure you learn our article, Methods to Change Your Bike Chain.