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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5
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3answers
18k 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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16answers
175k 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. ...
4
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1answer
2k views

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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16answers
88k 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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2answers
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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1answer
531 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 ...
16
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7answers
38k 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, ...
14
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5answers
17k 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 ...
13
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4answers
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 ...
11
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2answers
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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3answers
426 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 ...
4
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1answer
355 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 ...
3
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1answer
1k 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 ...
2
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1answer
132 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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3answers
1k 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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1answer
69 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, ...
17
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8answers
95k 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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5answers
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 ...
13
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5answers
7k 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 ...
13
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10answers
124k 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 ...
1
vote
1answer
159 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 ...
16
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4answers
23k 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 ...
4
votes
1answer
31k 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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3answers
7k 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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1answer
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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1answer
42k 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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1answer
3k 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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2answers
15k 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, ...
23
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7answers
3k 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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3answers
5k 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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4answers
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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votes
3answers
629 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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4answers
1k views

Cruiser bottom bracket is clicking and grinding

My Trek Pure Deluxe 3-speed cruiser has been making a clicking noise when riding for some time. The problem is faint, and is more felt than heard. However, it's been getting worse; it now makes a ...
5
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1answer
2k 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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2answers
593 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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2answers
3k views

Fixed Gear crank arm slips

The crank arm on my fixed gear "slips" when I put large pressure on the pedals like when I take that first pedal to get the bike moving or pulling up hard on my toe straps to slow down. The slip is ...
3
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4answers
12k views

Replacing Crankset. Do I need to replace chain? Then do I need to replace cassette?

Over the past year, my road bike's crankset has gotten pretty bent up and out of wack. Not due to abuse, just wear and tear I guess. It's pretty bent and has a nice wobble that I can see as I look ...
3
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1answer
284 views

crankset compatability

I am wondering if I would be able to run the 105 5800 crankset with my 9 speed ultegra 5600 shifters/rd? I don't have the funds to do the whole groupset at once, and I believe upgrading to 11 speed ...
2
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1answer
256 views

Can an IGH have the same maximum overdrive-ratio as a crank-sproket setup?

Is there an IGH that gives one the maximum overdrive-ratio that one might get with a 39-53T crankset and a 11-34T freewheel? If not, what is the mechanical roadblock in making one ?
2
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1answer
4k views

How do I re-attach a crank that has fallen off?

I have already read My crank fell off, how do I re-attach it?, but it did not answer my question. I was biking up a hill in first gear, and I felt my left crank was a bit loose. Never having had ...
2
votes
1answer
148 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 ...
2
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3answers
2k views

How to remove hex crank bolt

I have been looking online for tutorials on replacing a chainring (or three) for my Scott mountain bike: https://www.thebikelist.co.uk/scott/aspect-40-2012 When trying to take off the chainset so ...
2
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4answers
27k 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 ...
2
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3answers
623 views

What parts needed with new chainring?

I've read that the chainring is that spikey gear wheel at the bike's pedals that the chain egages with. The teeth on that chainring are so worn on my bike that the chain jumps off depite adjusting ...
2
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1answer
3k views

How to remove and find a compatible chainring for my FSA Comet 1x10

I currently have a 30 tooth chainring on my Devinci Kobain. The gearing is a little too tough for my current fitness level. I am considering putting a smaller chainring on it (as per this question). ...
2
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2answers
1k views

Sram Red AXS Crank Bolt Cap missing - how to remove crank, if at all?

I've got an Sram AXS Dub Crankset on my bike and noticed a few days ago, that the black cover around the crankset bolt (chainring side.. where you tighten/loosen usally to remove the crankset) has ...
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2answers
697 views

What do you call the crankset system type on the Sram Apex?

I see these everywhere, but no one can come up with a consistent name for them from company to company. GXP is the closest I can come to a name for the bottom bracket. http://www.sram.com/sram/road/...
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2answers
6k views

Will 10 speed cranks work with an 8 speed freewheel?

I'm looking at building a road-bike, and I've just purchased some wheels with campagnolo hubs, with an 8 speed freewheel on the back. Can I use Campagnolo Daytona / Veloce cranks on the front? I ...
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vote
2answers
5k views

How to remove an older Shimano Hollowtech crank?

I'm getting some creaking in my crank/bottom bracket and a good first step towards fixing this is to remove and clean the cranks and chainrings. If I still have the creaking, the BB is almost ...
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2answers
1k 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 ...