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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44 votes
16 answers
182k views

Creaking from cranks/spindle. How to fix?

Recently the cranks on my bike started to creak. I checked with my usual "bike-bible" Park Tool. They recommended dis-assemble, lubricate, re-assemble. So I did that. Remove cranks. Remove spindle. ...
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5 votes
3 answers
20k views

How to fix a stripped pedal crank

The threads on my bike's pedal crank just became fully stripped and the pedal fell off, though the pedal itself is fine. Is there any way I can fix this without fully replacing the pedal crank?
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5 votes
1 answer
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What types of BB-axle to crankarms interfaces are there?

On the lowest end, we have the taper/square interface. I believe it is standard i.e. there are no variations in the sizes. image property of VP Components USA Then there is the Octalink. Actually ...
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24 votes
2 answers
2k views

Selecting the right crank length

What is the best way to determine the correct crank length for my height and more specifically my leg length?
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  • 353
1 vote
1 answer
1k views

Stripped out bottom bracket

The bottom bracket of my bike was completely stripped to the point that when you push the left side crank arm, the right crank moves and you can see the bottom bracket lock move out the frame. The ...
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33 votes
16 answers
99k views

Triple vs Double chainring?

I'm bike shopping for my first road bike, and I've asked for a lot of advice from my father who was a serious cyclist once upon a time. After showing him one prospective bike, he dismissed it with a ...
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19 votes
7 answers
45k views

How to remove a crank arm with stripped threads?

A friend called me up yesterday after a mis-adventure during his attempt at a bottom bracket overhaul. He stripped out the threads on the (left) crank arm while using a Park crank puller. In a pinch, ...
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14 votes
5 answers
19k views

What is the effect of changing length of crank arms?

There are some length options for the crank arms - like 170mm, 175mm. What is the difference for the rider? In which way does it effect the commute? Tried looking at Selecting the right crank ...
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4 votes
4 answers
35k views

Crank threads stripped - both pedals fell off

Something really strange happened to me - 2 years ago I bought a bike (Carrera Gryphon Hybrid from Halfords). I had just about 100 miles on that bike the month I bought it and than I locked it to a ...
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14 votes
4 answers
3k views

Should square taper cranks be greased before installation?

There’s a fierce debate over whether the interface between a square taper spindle and crankarm should be lubricated or not. Adding to that, everyone seems to have their own take on the issue. Here’s ...
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13 votes
4 answers
9k views

Differences between Biopace and Rotor cranks

On mountain bikes of a certain age, "Biopace" chainrings are ubiquitous. These chainrings are (purposely) not circular. It seems that most people today agree that Biopace rings didn't live up to the ...
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11 votes
2 answers
2k views

Why such a tiny difference in crankarm length?

Why are there only 170 and 175mm lengths for the crank arms of MTBs? I would have guessed that touring bikes would benefit from far longer crank arms than those, suitable for mountain riding.
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9 votes
3 answers
15k views

Combining Shimano RS500 crankset with Stages Shimano 105 5800

I've been thinking about getting a power meter for a while now. I finally decided I would get one, but now I realise that Stages only starts at the Shimano 105 level. I currently have a Shimano RS500 ...
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8 votes
2 answers
1k views

Crank-arm fell off *after lube*

Background I've had my bike for several years and it's been fine with moderate use, but this summer, I ended up using it a lot (I rode almost 200km in less than three weeks). Problem It started ...
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  • 359
8 votes
4 answers
20k views

Advantages of higher quality cranksets

What are the advantages of upgrading the crankset on a bicycle? For example, my bike (2009 Kona Dew) comes with a FSA Dyna Drive crankset. I'm assuming this is a pretty basic crankset since it lies ...
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6 votes
3 answers
1k views

Wilier oversize bottom bracket bearing cups for Shimano crank

My bike frame is a Wilier Imperiale with Campagnolo crankset. I am changing the crank to a Shimano 6800. The bottom bracket does not fit to the Shimano one. It is old version WILIER OVERSIZE BOTTOM ...
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4 votes
2 answers
711 views

Mountain bike crank hits derailleur cable

Just bought my first bike and it was put together by the store. I was wondering if this little cable/wire is okay, it's hitting my pedal every time I’m riding. It doesn’t really bother me, but I don’t ...
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4 votes
1 answer
286 views

What tool do I need to use for this specific Crankset (picture) FSA M17 38-41 Nm from Giant TOUGHROAD SLR 2

I am having a problem with loose tightness of the Crankset (picture) and have no clue what type of tools do I need to deal with the problem. Any advice including the steps how to tighten it ...
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4 votes
1 answer
3k views

Square taper crankset develops play after changing bottom bracket

After replacing a bottom bracket with square taper I repeatedly have to tighten the screws that fix the crankset (on each side) to the bottom bracket axle or otherwise I can feel sometimes a slight ...
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4 votes
1 answer
623 views

How can one remove this chainring?

I have a crank and chainring setup pictured below, running as a 1x with a chain guard where the outer ring would be. I am trying to remove the chainring from the crank and am having trouble. The ...
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2 votes
3 answers
2k 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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2 votes
1 answer
155 views

When pedaling forward my bike suddenly disingages and goes limp

My Ridgeback Velocity bicycle suddenly disengages and goes limp and loose when pedalling forward, similar as if I'm pedalling backwards.
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1 vote
3 answers
3k views

Which tool for fixing wobbly crank?

Any idea what kind of tool should I but to fix the loose left crank on my bike? I found this https://www.amazon.co.uk/Park-Tool-CCW-5-Crank-Wrench/dp/B0012Q5XAS but not sure if it's gonna suit. Or is ...
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0 votes
2 answers
2k views

Can I fit a 105 crank arm (stages) to a Claris 2400 crankset?

I currently have a Specialized Secteur with a Shimano Claris 2400 crankset (compact). I'd like to buy a Stages power meter but they do not sell Claris crank arms. Can I simply put a 105 crank arm on ...
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  • 103
0 votes
1 answer
95 views

Handling Stability Parameters [closed]

I'm building my first bike: probably steel (easy to work with). 2X26" road tires. Full suspension. Will be used on sandy dirt roads, and paved streets with moderate incline. Want hands free option, ...
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  • 11
0 votes
1 answer
1k views

Crank fell off square taper BB. Should I replace bottom bracket

After years of use and multiple retightenings my crank will fall off my bike about once a week and definitely needs to be replaced. I believe that the square hole of the crank has expanded to the ...
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  • 103
22 votes
8 answers
144k views

Noticeable clicking from crankset or bottom bracket

A few days ago I began hearing a clicking noise coming from the crankset and I can also sense a slight hitch when the right crank is at its upmost position just when it's about to go down. The ...
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  • 355
14 votes
10 answers
141k views

Why does my bike make a noise when I pedal hard?

When I pedal forcing a little with my right leg, the bike makes a noise that I don't know how to describe. I'll try to do it. It's like: a short "ting" a tiny bell if a small rock hits the down tube ...
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  • 301
14 votes
5 answers
10k 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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9 votes
5 answers
39k views

Clicking sound coming from pedals/pedal spindle/crank

I recently bought a Trek 4300 series MTB, but after only several weeks of use, I'm getting a clicking sound coming from both sides of the pedals. It seems particularly pronounced when more torque is ...
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  • 213
16 votes
4 answers
25k views

Do Pros use compact cranksets?

Do pro riders use compact cranksets for hilly races? I'm trying to determine if switching to a compact double will mean I don't have the top end speed to be competitive in higher levels of racing (I'm ...
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  • 6,080
6 votes
2 answers
34k views

Why does my non-drive side crank arm come loose?

I tighten the bolt super hard. Ride for a while. Then it comes loose again. I don't know if its my BB or the bolts. How can this be fixed??
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5 votes
2 answers
4k views

Can I put a 8 speed bike on a Elite Suito 11 speed direct drive turbo trainer

I have recently ordered an Elite Suito Direct Drive FE-C turbo trainer. The main use is for indoor, winter cross-training for my young son who's a keen athlete (we don't want to send him out in the ...
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4 votes
3 answers
2k views

Replacing a crankset after 1 hour!

First time here! My brand new bike arrived this evening and I’ve broken it with an hour. It’s a Vitus Nucleus 27 VR Bike (Altus 2x9) 2020 I took it out and about 50 mins into the ride I noticed the ...
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  • 141
4 votes
3 answers
9k views

Shimano Hollowtech left crank arm getting loose

After 2 years of good use, left crank arm on my FC M542 crank set has started to get loose quite often (cca 500 km). It is usually indicated first by few now an then click-clanks somewhere in the ...
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3 votes
1 answer
2k views

Replaced left crank arm but still comes loose?

A few weeks ago I bought a new (albeit cheap) self assembly bike from a local store, this bike to be exact http://tinyurl.com/gw77p9t . After about two weeks use (one and a half hours of cycling on ...
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  • 133
2 votes
1 answer
6k 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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2 votes
1 answer
43k views

diference between 170mm 172mm 175mm crank arm length on road bike [duplicate]

What is best for which use, advantage, or application, especially for climbing.
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  • 333
1 vote
1 answer
288 views

Bottom bracket servicing

My crankset is driving me nuts, because of creaking noises when pedaling. I have fixed the issue twice already, by removing the bottom bracket (FWIW, it's a 68x115mm square, pictured below, and my ...
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1 vote
2 answers
19k views

Is the 9-speed Sora crankset compatible with 105 11-speed chain?

I'm thinking of upgrading my bike, which has a Sora 9-speed system on it (50/34 chainset). The upgrade is for esthetic reasons - i simply like the look of the internal cable routing. That being said, ...
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23 votes
7 answers
4k views

Are Z-shaped cranks a good idea?

I've stumbled across this kickstarter project, which promotes an original shape for cranks: They claim a wider arc of useful push during rotation. While their main point is rendered moot by clipping ...
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11 votes
3 answers
6k views

What is "crank preload"

I'm in the middle of swapping my BB30 cranks from stock FSA Gossamer to a (shorter length) SRAM BB30 "IA" S950. The S950 has a "crank preload" adjuster on the NDS which the spindle is also attached ...
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9 votes
5 answers
122k views

50/34 vs 52/36 crankset for 11-32 cassette (shimano 105 5800FC)

Following up on this enlightening answer, I would like to know the differences between 50/34(compact), 52/36(mid-compact) and 53/39 (standard). The cassette I am choosing is 11-32 to give me a wider ...
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  • 193
8 votes
1 answer
698 views

I replaced my bottom bracket and now my crank arm bottoms out on the square shaft before it can be torqued. What did I do wrong?

I just replaced my bottom bracket using another one of the exact same make and size (Sunlite 68mm x 103mm square tapered shaft cartridge). It installed smoothly and everything seemed to be going well ...
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  • 183
8 votes
3 answers
7k views

The pros and cons of crank self-extractors

I'd like to know more about the reliability of self-extracting crank bolts, but haven't found much information on how they perform (or how they don't). My interest stems from touring and ...
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  • 4,160
7 votes
4 answers
15k views

What should a big guy look for when buying a road bike?

I'm 6ft 4" (1.8m) and 22st (139kg). I do a fair bit of cycling, mainly spinning and mountain biking. I would like to get into road riding so I'm looking to buy a road bike. I want to spend between £...
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6 votes
1 answer
6k views

Do crank arm pullers vary in sizes or there is just one size?

Just want to confirm if there are different types of crank arm pullers? I'm trying to order one and the contact person is telling me that he has one but for a road bike. Now I'm confused I thought ...
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  • 257
6 votes
1 answer
15k 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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6 votes
2 answers
4k views

Lost left crank arm crank end cap

What parts do I need to put this back together? I've lost some pieces going for a ride but I'm not sure what exactly. I think I'm missing the end cap to the crank and maybe a spacer. I was heading ...
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  • 1,285
5 votes
3 answers
1k views

Shorter crankset on road bike

I’ve been wondering what are the pros and cons of having a shorter crankset. I’m looking into changing my crank length to a 165mm. I currently have a Shimano FC-RS510 172.5mm upgrading to Shimano ...
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