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 a 2012 Trek 7.5 Fx Hybrid bike that I need to replace the Freehub body on the rear wheel. There are no identifying marks on this hub anywhere. The cassette that is mounted on the Freehub body is a CS-HG61-9. The gears on the cassette is 11-34 and its a 9 speed. Is there anyway to exactly identify what freebody hub this is so I can get an exact replacement?... Read more >>
Well, hello everyone this is my first post.
I have been trying to renovate an old road bike a British hercules. The thing is that the bike has old components and I have trouble finding other ones. I want to keep the front chainring 48t but remove the internal hub that my gramp was using. Instead i decided to buy a nice wheel with a 9 cassette and the suitable deraileur. Well my main problem is...Will this fit with the 48t chainring? Is the deraileur going to be ok with the claw type hanger (the bike has no built-in hanger)? In copenhagen where I live we have no steep hills, every... Read more >>
I have a two ring Tracer crank on my ross road bike. I am just wondering if it's any good or not.... Read more >>
I got a Bell brand chain from walmart for my other bike and the quick link is so annoying to put back together when I need to take it off for some cleaning. Well, I try and hold the derailleur and put the chain back together but I suffer from panic attacks from time to time and I just get so annoyed with having to hold the derailleur and putting the link back together at the same time. Any tips to help me do it better without getting frustrated or annoyed?... Read more >>
So my bike kind of broke and I adjusted some things to fix it, but then a new problem arose.
The thing that broke and bent badly was the metal that held the two cogs in the back wheel of the bike ( the gear shifting thing) so I bent it back into shape and screwed it back on but whenever I pedal the bike the chains starts going into its cycle but in a few seconds the chain slips off the bottom cog in the gear shift and the chain slowly slips off everything else. Is there anyway I can fix this?[/align]... Read more >>
So I'm new to these forums and also to bicycling, like I just recently learned how to ride a bike and a 2 weeks ago I bought my first bike.
So I have been having troubles with my bike for some days now, It got really bad at one point but I've been able to fix it a bit. With very bad in the form of the chain falling from the front gears.
I have fixed that, however, the chain cannot get to the biggest gear of the front. I'm not really sure why.
Can someone help me?... Read more >>
I'm running a full SRAM X9 / X0 on my hard tail with XT discs. I want to move from 2x10 to 1x10 set up. The biggest cost is the cassette to give me more choice will a Shimano cassette fit onto a SRAM ready hub?... Read more >>
I am/was in the middle of changing a snapped rear axle, and came to the conclusion I needed to remove the cassette to tighten the components of the new axle enough.
Anyhow on removing the cassette/freewheel ball bearings went everywhere and it seemed to be much more complicated than first thought.
Below are a couple of pics of how everything now is.
What do I need to get this thing going again?
Excuse if I have mixed terminology etc, bikes are not my strongpoint although I am curious to learn.... Read more >>
I've been having a problem with a broken new chain. When I removed the broken link, the inside link falls apart. When I remove the inside link, the next inside link falls apart. Is this something wrong with the chain? I haven't had this problem in the past. I noticed that on old chains, the oil and dirt might have been holding the inside link parts together, so I wondered if that's why I didn't notice it before.
Is there a tool to hold the inside links so they don't fall apart? (I guess I could just use a vice grips.)
Thanks.... Read more >>
I'm refurbishing my Dad's old 1998 Trek 820 with the following OEM
specs for the crank and bottom bracket - first bike I've ever done this to but thought it would be an good entry into bike repair (since I just got a bike tool set and XMAS $ to do the project)
Shimano Altus CT92 (24/34/42 Square Taper) 170mm crank length paired with a
BB-CT91E, 68mm / 118mm spindle length bottom bracket
Its easy enough to crossover (and find online) the BB to a UN55 (68mm/118mm/English). The questions revolve around the crank (which seems to be harder to find a repla... Read more >>
Im a new member although I have been visiting this site for sometime now and have had many of my questions regarding buying a bike answered thru existing threads.
I have bought myself a Diamondback XR3 as a cheap starter bike and plan to upgrade to a mid range road bike in the future.
Im hoping i can get some advice regarding the front chainset. Ive noticed that it isnt running true and straight as it rotates. Id say there is about 6mm variation. It is far enough out of alignment to cause the chain to come off when Im on either the largest or smallest... Read more >>
What? You might say...
I hope someone can help me with an odd request. I'm planning on building a robot and want to build treads from old bicycles. I've spent a couple days searching for my answer but not knowing all the bike part nomenclature I'm afraid I don't know the words I'm looking for either.
Is there a way to modify a freewheel sprocket so that the ratchet doesn't work and the sprocket can move freely both forwards and backwards?
I got a couple kids bikes for a few bucks at goodwill and have realized that I probably can't do what I'm asking wit... Read more >>
~1970 Gitane Mixte. Prior to rebuild wife could only pedal forwards, as peddling backwards would have chain occasionally jump off.. but only in larger rear gears and larger front sprocket.
To my knowledge, this bike has not been serviced.
I believe I now know why.
If I look from rear of bike forwards with eyes at axle height, I'm seeing the that the chain from what would be the middle of 2 front sprockets, would hit the 4th of 5 gears (next to smallest rear gear)...
Looking at internet posts, this would seem to want to be aimed for the 3... Read more >>
I currently have Shimano 105 12-25 10S but want to change the rear cogs to 11/28 to make it easier to get up hills, Is it just a matter of switching them over or do i need to do anything with the chain ?... Read more >>
I replaced the chain on my wifes road bike about 800 miles ago and I just happened to check it today and it is already at the .75 wear indicator on my chain checker tool. I have kept it lubed(dry formula lube) just about every time we did a century or other ride, but can't figure why they are wearing out so fast. Can't you normally get at least a couple thousand if you maintain them right??
Seems like I read somewhere that if the cassette gears are worn considerably(does not skip a link in any gear) that the chain will wear out quickly. Is this true or am I just crazy? <... Read more >>