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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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Changing crankset

I'm new to mtb and have just purchased and waiting delivery on a Giant Stance 2, I would like to convert to a 1x9 with a smaller crankset, would I have to adjust my chain to suit a smaller single ...
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2answers
48 views

Alfine crank 1x9 setup, spacer issue

I'm currently rebuilding a 1992 Kona Cindercone as a 1x9 commuter. The rear spacing is 135mm and the bottom bracket shell is 68mm. I've mounted a alfine crank on it and remove the spacer that what ...
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2answers
66 views

Minimum space between square taper crank and bottom bracket

I upgraded to a new square taper crankset on a single-speed drivetrain and now the gap between my crank and the bottom bracket is bigger. That's because the cranks taper shape is different from the ...
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2answers
44 views

Andel crankset, BB axle length and chainline

I was planning to buy an Andel Standard Track crankset. It uses 110mm axle bottom bracket, but the stock bracket on my bike is 103mm. Will this mess up my chainline?
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1answer
43 views

Scott Addict R2 2008 crankset replacement

I want to replace crankset on my Scott Addict R2 2008. Current crankset is Dura Ace 7800. If I looked correctly then currently I am using BB SM-BB71-41. New crankset will use BB386EVO. Which BB do I ...
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1answer
149 views

Chainring bolt stuck in 105 FC 5800 chainring

See my update at the bottom of the question When installing my 4 bolt Shimano 105 FC 5800 chainrings on a modified FSA Gossammer Crank (TEAM ZWATT ZPIDER) I first test fitted the chainrings with ...
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1answer
99 views

What is this crank part called?

I recently had a Shun SS-8001 crankset fail. When taking it apart, I saw that the right pedal has a sort of stop ring that prevents the pedal, presumably, from unscrewing itself: Now I need to find a ...
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1answer
70 views

Is an SLX M7000 crankset compatible with the rest of my drivetrain?

I ride a Comencal Meta HT AM Origin. Unfortunately I need to buy a new crankset. I’ve been thinking about Shimano SLX FC-M7000 34-24T with a new bottom bracket, BB-MT800. Do you know if that ...
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1answer
66 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
681 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
93 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
289 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
93 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
113 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
82 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
480 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 ...
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1answer
66 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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0answers
72 views

What bottom brackets are compatible with Miche Evo Max cranksets (self-extracting type)?

I'm in need of a Miche Evo Max bottom bracket and they are not readily available where I am. The hub resembles Hollowtech but it has an internal aluminum spacer to limit bearing side load, as the left ...
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1answer
44 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
203 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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0answers
76 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
331 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
817 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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0answers
61 views

New bike and drive train feels like it slips on every crank rotation?

I bought my wife a new bike and she said It is "slipping". I took it for a ride and sure enough, it feels like it is slipping just a tad on every rotation. Its not an in-between gear or tooth slip. ...
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1answer
62 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
122 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
66 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
91 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
275 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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0answers
84 views

Replacement crankset and pedals for Schwinn Meridian trike

Where can I buy a replacement crankset and arm pedals? My pedal broke off, so I need to replace the sprocket side crank arm. Can I simply replace the sprocket with another of any brand?
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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
130 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
654 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
139 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
85 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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1answer
40 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
109 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
519 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
153 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
3k 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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2answers
186 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
55 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
56 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
395 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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3answers
303 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
59 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
129 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 ...
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2answers
58 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 ...
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2answers
831 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 ...
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1answer
2k 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 ...