Questions tagged [crankset]

The crankset is the combination of components that convert motion from the rider's leg movements into rotational motion to drive the chain and propel the bike. The crankset includes one or more chainrings (sprockets) and the two cranks, or arms, to which the pedals are attached.

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1answer
230 views

How do I figure out what crankset replacement will fit my derailleur?

I have a bike with a Shimano FC-M560 crankset in the front which I want to replace. I naively bought a Shimano FC-TY301 crankset, thinking that there's norms and that 3-speed cranksets are more or ...
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5answers
699 views

What kind of crankset is this?

Can someone help me identify this crankset type? And is it possible to replace only the cranks (and their axle) without replacing the chainwheel/front derailleur?
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1answer
263 views

How to change small chainring

I have a bike with a 46/36T crankset (FSA Gossamer Cross BB30) and I'd like to change the small chainring to an even smaller one. ​Googling around ​suggests that the smallest chainring I can get for ...
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2answers
898 views

Ideal distance between chainring and chain stay

I am building a single speed bicycle, and I have most of the drivetrain parts: Rear hub 18T rear cog (40-40.5mm ideal rear chainline -- wheel undished) 1/8" chain crankset with 40T chainring I used ...
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3answers
298 views

BB spindle length/chainline for re-used Shimano FC-M391 chainset

I'm trying to rebuild an old Univega MTB. Primary goal is to build a good or decent bike from used parts. The crankset+bb that was on the bike when I got it was really worn out. I unscrewed it and ...
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2answers
310 views

Loose thread (stripped) tapered bottom bracket frame connection

The threads in the MTB frame that is supposed to hold the bottom bracket lock rings were very loose and it can't hold the bottom bracket in place. The previous bike owner tried to apply Teflon tape in ...
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3answers
641 views

How to tighten the Hollowtech II (on R2000 Claris) cranks?

The owner's manual on my new bike (with the new Shimano Claris, not the old one with Octalink) asks me to do this: After the first 20 km tighten the crankset and also tighten the pedals in the ...
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3answers
1k views

Can a 21 speed Shimano Tourney groupset get converted into a 7-speed?

I currently ride a 3x7 Tourney bike, which I’ve upgraded moderately and it is riding nice. I’d like to know if I can somehow replace my 3-crankset for a simple one, and also get rid off the front ...
3
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1answer
115 views

Self extracting crank preload

This question got me wondering about self-extracting cranks: What bottom brackets are compatible with Miche Evo Max cranksets (self-extracting type)? Where I've seen them on cartridge bottom brackets,...
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1answer
236 views

Do I need a spacer on my crankset? (2x11 SLX, BB shell width 92mm)

I have recenly changed my crankset from FSA comet to Shimano SLX. I have a pretty large BB shell (92 mm) and there is a press-fit BB installed, so it doesn't protrude. So how can I figure out if I ...
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2answers
2k views

FSA Comet (CKM-7158T) crank removal problem. How to?

I am dissembling an FSA Comet crankset, and I have removed the self extracting bolt from the drive side. But I cannot remove the crank arm, it is sitting super tight. I am hitting it pretty hard ...
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1answer
338 views

Front chainring spacing difference between Shimano and Campagnolo?

I want to upgrade my mid 80s road bike from a 50 tooth to a 53. But the BCD of the big triple chainring is some rare standard that it costs less to buy a whole (used) crank instead. And of course this ...
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1answer
1k views

What is required for a proper boost chainline on a 1x drivetrain - only a boost chainring or an entire crankset?

To obtain a proper chainline for a boost rear hub (~52 mm), is it enough to fit a boost (3 mm offset) chainring to a 1x crankset which is originally non-boost, or is an entire boost crankset required (...
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4answers
8k views

Clicking while pedaling

I recently purchased a 2nd hand bike, and I am facing a clicking noise when I pedal (under slightly higher than normal load). I feel it almost as a pair of clicks in both pedals, and I feel one click ...
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1answer
79 views

Crankset or chainring replacement

I have a Marin Bolinas Ridge 7.1, I am not happy with the front large chain ring size, I mainly ride on the road, and have an extremely limited budget. I would take it to the LBS, however, I believe ...
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1answer
369 views

Carbon fiber crank arm with scratches--how much damage is a concern?

I have a compact SRAM red crankset with carbon fiber crank arms. On the left side, the outside coating on the end has chipped off from sometimes colliding with the ground while turning. At what ...
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2answers
562 views

Sram crankset compatibility

I have a bike with SRAM s350 172.5mm 40T chainset, SRAM GXP 68mm BB and 12x142mm through axle rear hub, which should make my chainline 49mm. As I have knee issues I am looking for 165mm crank arms (...
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1answer
106 views

Why are crankset “sizes” often defined by the amount of cassette sprockets?

For example: https://bike.shimano.com/en-EU/components/road/category/crankset.html Almost all of the listed cranksets have sizes listed as 2x11/3x10/3x9 - why does the amount of cassette sprockets ...
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1answer
725 views

Using spacers on crank spindle instead of bottom bracket when fitting HollowTech MTB crank to road bb

HollowTech road BB is 68 mm wide and fits a road crank without spacers. Hollow tech mountain BB uses up to 3 x 2.5 mm spacers. Hence crank is designed to be used with 75.5 mm wide bottom bracket ...
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1answer
124 views

Electric road bike - Compatibility questions

I am building an ebike on a road frame. I am using a Bafang G310 rear hub motor & 8 Speed Shimano cassette. I plan to use a long MTB rear 8 spd derailleur (either Acera or Alivio). For my crankset ...
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1answer
293 views

is it compatible the left crank arm of ultegra 6600 with ultegra 6800?

I would like to buy a power meter and the nearest I found to my shimano ultegra 6600 crankset is the ultegra 6800 left crank arm. It is the same size though. many thanks
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1answer
1k views

Crank arm doesn't go all the way on square taper axle

Doesn't matter what I do, I can't seem to push the arm all the way, even though the bolt is tight and it feels stable: I just replaced a worn out and damaged arm but they look similar enough to not ...
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1answer
163 views

What is this bottom bracket

We were doing a volunteer bike repair clinic and came upon this bottom bracket that I've never seen before. It was on a trials bike and the crankset was destroyed but we couldn't find any way to ...
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1answer
178 views

Incompatible front derailleur/crankset?

I recently bought a Tandem from the 90's and now trying to adjust the derailleurs. But, no matter what I do, I don't manage to properly set up the 3-way front derailleur. It either properly shifts ...
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3answers
89 views

Is it possible to change to a larger and type of crankset from a one-piece Ashtabula style?

I made an E-Bike out of a cheap bike. It uses those one piece cranks. I was wondering if I could get a bigger gear. The motor top speed is 36km/h and I would like to assist the motor while going at ...
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3answers
218 views

Stiff knee, can I use a shorter crank on one side?

My left knee is stiff and arthritic after 5 operations. If I have the saddle high enough not to over-flex that knee, I can barely touch the ground ... as I am elderly and not very agile, this is not ...
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1answer
2k views

Upgrade Options for Shimano Crankset Tourney FC-TY701

My son has bashed up the inner ring on his crankset (Shimano FC-TY701) and since it is riveted I can't replace the bent ring. I want to replace it with something better but am not planning on ...
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1answer
332 views

Can not replace Shimano Octalink with 105 Crankset

Hello! I am trying to upgrade my bike’s Octalink BB 118 mm to a 105 5600 BB and crankset. The problem is I can not make the plastic pin of 105 left leg fit the hole. I think the axle is too short or ...
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5answers
6k views

Why does a loose pedal destroy the crank threads?

Can someone cite with sources the process by which a loose pedal pretty quickly destroys the crank arm threads necessitating a helicoil repair? I'm interested in how the thread on the crankarm gets ...
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3answers
399 views

Broken Crank Arm - Chainring Connection

I was just riding my bike like normal the other day and the crank arm started slipping. Upon further inspection, I discovered the 'bolt' that connects the crank arm on the drive side to the chainring ...
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1answer
77 views

Crank Set Quality Differentiators

I work for a bicycle tour operator in Cambodia. We run daily tours on mostly paved roads. I'm looking to purchase new crank sets for ten bikes but I'm having trouble determining if any of the models ...
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2answers
87 views

Changing the middle chainring on a 3-chainring crank

I have a shimano acera crankset (3x) that is 28-38-48 with a 8 speed rear derail. Now I was going to convert this bike into a SS but decided not to mess with it. Can I take off the middle chainring (...
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4answers
1k views

Help understanding effect of Crankarm length on gear ratios

Trying to learn more about bike fit and gearing, and having trouble understanding the effect of crankarm length on gearing. In an article on bicycling.com it states "The relative jumps between gears ...
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4answers
1k views

110mm crank on 73mm BB shell

I have a roadbike with a 73mm BB shell and I recently bought a Tiagra compact crankset that has a 110mm bolt circle length. However, I can't get enough of it to come out the other side to properly ...
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0answers
85 views

Schwinn sidewinder 21 gear slipping?

If rear tire is off the ground, the wheel will spin when pedaled. When wheel is on the ground the pedals will move the chain in any gear but will not move the rear wheel. The chain is not losing ...
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1answer
290 views

Compatible crankset - Giant Iguana

My gears started slipping on my Giant Iguana Disc (probably neglected chain) so I've changed chain and cassette. Wanted to change crankset so I've bought a Shimano FC-M311 but found that those 4 teeth ...
2
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2answers
96 views

Crankshaft Replacement

So I have an old Schwinn Crossfit MTB that Ive loved and had for a long time and recently wanted to fix and upgrade it a bit. I wanted to know about the crankshaft compatibility for it, as ill im able ...
2
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2answers
2k views

What is the metric thread diameter of my crank arm pedal thread that's stripped

I'm in the market for a threading repair kit. I live in Australia so the closest options for me are to go to Supercheap Auto or Bunnings Warehouse (links to products from those stores). These repair ...
6
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1answer
6k views

Replace a 52/36 crankset with 50/34

I'm looking at purchasing a new bike with a 52/36 crankset on a 11-32 cassette. I've grown accustomed to a 50/34 crankset on the same cassete, and for the type of riding I do in the PNW (300-400ft ...
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2answers
72 views

What parameters should I consider when choosing a crankset?

I have to change the crankset on the quite old bicycle. I need to order it online so what parameters should I consider when choosing the right chainset? It's used 7 gear bike and I don't know what ...
2
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1answer
716 views

Spindle diameter on the FSA Gossamer TT MegaExo crankset

What is the spindle diameter on the FSA Gossamer TT MegaExo crankset? 24 mm or 30 mm? I can't find a direct answer anywhere. I have seen MegaExo described as 19 or 24 mm, but "Gossamer" as 30. I'm ...
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3answers
9k views

Crank Arm Compatibility - Shimano Ultegra 6800 and R8000

Does anyone know if an Ultegra 6800 left crank arm will work on an Ultegra R8000 crank? I'm looking at upgrading my road bike, and I'd like to move my current crank-arm power meter over to the new ...
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2answers
811 views

QUARQ DFour installation on Shimano bike

I'd like to replace my Ultegra 6800 crankset with QUARQ DFour powermeter. But I don't know how to choose between BB30 and GXP versions. I have Shimano Pressfit SM-BB92-41B bottom bracket. Do I need to ...
2
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1answer
788 views

Single to double chainset conversion

Can I change a single chain ring to a double? I have an old steel frame with a narrow bottom bracket shell 66mm and a single 50 tooth chain ring. I would like to add a 36/40 inner and want to know ...
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2answers
200 views

getting the crank arms off an old bsa bike

So I'm resuming work on restoring a bsa bike for my sister. The first thing I need to do is strip it as it's in need a of new paint job. I'm having trouble removing the crank arms. They appear to ...
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1answer
173 views

Using normal square bottom bracket on crankset designed for E type?

I am building a LHT 26" and I am planning to use a square taper bottom bracket. Also want to have triple chainring with a small chainring 22T so bought the Shimano Alivio FC-M430, about the best ...
2
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1answer
3k views

Loose crank exercise bike

I have an older Multisports EnduroCycle 550. The crank seems to be loose - the pedals wobble a bit side to side. How can I tighten that back up or do I need new parts?
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3answers
208 views

Is this crank usable or should it be replaced?

I've been suffering from weird noises while pedalling for a couple of weeks. Noise has been isolated to the left foot, its definitely not the right side. After an inspection revealed no cracks or ...
2
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2answers
171 views

Replaced my crackset, chain keeps popping off the small chainring under load

Looking for a little lower gearing on my gravel bike, I replaced the crankset with a FSA Omega with 46/30 chainrings, along with a new bottom bracket & chain. If I stand on the pedals while on ...
2
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4answers
5k views

Cause and diagnosis of wobbling crankset/chainring

I was replacing the chain recently. When spinning the crank I noticed that the chainrings are slightly wobbling along the axis. I was able to see the wobbling with my eyes. First check I kind of ...