23. How to Replace Your Chainrings
Basic removal and installation instructions for 5-bolt chainrings on 3-sprocket systems.
This tutorial will demonstrate how to remove and install chainrings. Since there are so many different crank and chainring sizing combinations, I’ll stick to the basics and give a general overview of the process based on a 5-bolt, 3-chainring system.
Before removing the largest two chainrings you’ll often have to remove the smallest one, which is often threaded directly into your crank arm. Use your allen key to loosen all of the bolts that hold the chainring in place, and then use a marker to make a note of the chainring’s position in relation to the crank before removing it completely. Some chainrings have a bump sticking out that should be lined up with your crank arm.
The largest two rings are usually bolted to each other with a nut and bolt. Here you’ll need to hold the nut in place with the special chainring wrench while you loosen the bolt with your allen key. Once again it’s a good idea to mark the chainring’s position in relation to your crank arm. The two largest outer rings often have a few spacers or washers in between, so be sure to note exactly how they came apart so they can be reinstalled correctly.
While it’s ok to install a new chainring that has a different number of teeth, you’ll want to make sure that your new chainrings have the same side profile as the old ones.
Before you reinstall the bolts, apply a thin layer of grease to the threads to keep out moisture. Now you can reassemble all of your chainrings the same way they came apart.
Make sure all of the bolts are finger tight and then begin tightening them evenly in a star pattern. Start by tightening the first bolt, and then every second bolt until you’ve gone all the way around. Repeat this process until all of the bolts are tight. Be careful not to over-tighten. Park Tools recommends 44-88 inch pounds of torque for aluminum bolts, and 70-95 inch pounds for steel bolts.
I have ridden my bike, a 1995 Mongoose Alta, for the past 20 years and replaced just about every component on it except for the frame, FD and front wheel. Gone through 3 RDs, several chains, rear hub, both shifters, etc. I'd estimate it's lasted at least 30k miles. I put road slicks on it and use it as my daily commuter, going 10 miles/day now. Love the bike!
Last week, the chain started skipping when I pedaled har... Read more >>
I'm stuck with a problem of chain slipping on my old bike that i wanted to fix myself.
I changed the whole drivetrain and maybe this is as simple as a mismatch since i have about zero experience in bike maintenance, i tought you would know for sure.
Here are the components i chose to put on based on 8 speed compatibility and cheapness:
Front Derailleur: Shimano Acera FD-M360-6
Rear Derailleur: Shimano Acera RD-M360-SGS
Front Chainset: Shimano Acera M361 triple set square taper (42-32-22)
Cassette: Shimano Acera HG41 (11-30)
Chain: Sram 8 ... Read more >>
My old nishiki bike was having some troubles with the chain, when I pedaled hard it would slip and gear shifting was rough so I inspected it and found a seized link and replaced the chain. When shifting (non indexed shifter) sometimes if I'm not being careful the chain will go between 2 gears and spin freely when shifting to a lower gear. My assumption is that my rear freewheel/cassette needs to be replaced, is this the case or is it possible that I did a poor job adjusting the derailleur?... Read more >>
I have a 1992 Trek 6000 with the original Suntour AP II 12-30 7 Speed Cassette.
It's now time to upgrade the cassette to something newer. Is it possible to change the hub as well as the cassette with another Manufacturer?... Read more >>
My first post. I have a 2004 Fuji Del Rey Hybrid with stock parts---> http://www.bikepedia.com/quickbike/BikeSpecs.aspx?year=2004&brand=Fuji&model=Del+Rey
I picked up another bike for the puropse of taking this bike off the road for overhaul. It is my utility bike-has a big rack, etc.
I love this bike, it is incredibly comfortable and very upright and safe for city maneuvering and wish to keep it, but... Read more >>
I recently pulled my Mongoose out of storage and i need to replace the chain, tubes, tires, and grips (i think that's all :/)
I started taking the chain off before i realized what all was involved. I got the back section of the chain off, then I saw that there is a piece above the pedals that holds it in place. How exactly do i take this chain off? I tried to find a master link on the chain but they are all the same. Where do i break the chain? Can i just snip the chain and buy a new one with a quick release since I have to replace it anyways?... Read more >>
I have a 2011 specialized secteur that came with sora groupset on it.
I always keep my bike properly cleaned and lubed.
recently my chain started skipping round every so often on certain gears when I push hard through the pedals such as hill starting, but this would also happen randomly mid pedal strokes, say on the flat. I messed with cable tension and new cables etc but no joy and the cogs started to show signs of being damaged.
I checked with the chain wear indicator and it wasn't yet even worn to 0.75 but I made the decision to replace the 9 speed hyperglide hg50 ... Read more >>
I installed a new Shimano chain 2 weeks ago and before each ride I wipe the chain dry with a clean rag until no oil transfers to my finger when I touch it. After my ride, the chair leaves a black smudge when I touch it. So far all my rides have been in dry conditions
I take this to mean that the factory lube still suffices and I can put off,applying additional lube as long as the chain continues to exhibit an oily film after each ride.Am I correct in this reasoning?... Read more >>
I have just joined within the last hour and this is my first post so please forgive any mistakes.
I live in Northampton ,In April this year I purchased a brand new Viking Prelude 2013 womens bike as a present for my wife from a well known company in Wigan.
On Saturday while riding the bike my wife had a puncture on the rear wheel . I took the wheel off and for some dumb unknown reason I also unbolted and took off the gear derailleur . I fixed the puncture and re-fitted the wheel and the derailleur but when I turned the pedal the rear wheel appeared to... Read more >>
Hi, can anyone help me? I have been looking for a chain ring guard for a 1985 Sugino GT triple crank 46/36/26t. I want to keep all 3 chainrings. I have spent countless hours and days trying to find something.I have looked at the bush guards, they may have something there. I was reading a thread about someone else who was looking. That is one of the reasons that I signed up. I wanted to reply to that thread, but now I can not find it. I am trying to keep my pants and leg clean. My bike is a Panasonic ATB.... Read more >>
I'm currently have a Shimano 105 derailleur, 11-25T 10 Speed. I want more help on hills, and will be switching to a 11-27 or 12-27 cassette. I'll buy a new chain also.
What is the difference between the 11-27 and 12-27? Will I have to change my derailleur since this will be a new size?... Read more >>
I have a SR-500 all Shimano 105 Components.The bike came from factory with six speed 13 tooth thru 23,at some point before I got it it was changed to 14 tooth to 24.Know that there was a option for a 53 tooth Biopace but don't see any on the normal sites.I think the 53 will work with 14 tooth,anyone ever try this gear ratio?... Read more >>
When purchasing a new crankset, would you get a new lockring, or would that have to be brought separately? As the lockring on my bike is damaged, though not budging. Only just realised this, (face palm)... Read more >>
I have a Gary Fisher Marlin that's 10+ years old. I bought a bash guard and removed the big and small chainrings as well as the front derailleur. I'm not using only my old middle chainring up front. I first attached the chainring backwards, but noticed this when the chain was jumping off while the bike was still on the stand. I took the crank off, unscrewed everything, and put it back on facing the right way.
Went for my first ride this morning and the chain kept jumping off the chainring, especially when going over bumps and regardless of the gear I was in.
I h... Read more >>
Hi, I'm new here and fairly new to bike mechanics. I have an old Mongoose Rockadile SX from 2004. I'm trying to remove the 7 speed shimano casette it came from the factory with to a new wheel. I made sure I got the spacer as the new wheel has an 8-9 speex hub. I have a cheap x-tool bike tool kit. It has 2 free wheel wrenches/spanners. Both are too big. One is only slightly too big. Maybe 1mm if that. I think that spanner/wrench is an fr-1 but I'm unsure. Can anyone help with advice or links to the right type of casette spanner/wrench?
The wheel I have bought is a Halo Combat II,... Read more >>