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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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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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
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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  • 685
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
21 votes
10 answers
7k views

Stuck pedal, I've tried everything

I'm looking for suggestions, when basically everything has failed to remove a pedal. It's a pretty new bike (Trek 520). The drive side pedal came off fine, the non-drive side did not. I am aware that ...
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  • 311
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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19 votes
2 answers
3k views

Plastic ring on new Shimano crankset, toss or keep?

I just got a new Shimano crankset and it has this plastic ring on the "inside" of the small chainring. I'm thinking that this just some packing material. Am I right and can I toss it, or is this a ...
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  • 2,321
18 votes
7 answers
5k views

What if both wheels were powered by pedalling?

Only the rear wheel of a bike is connected to the drivetrain in order to propel the bike forward. I assume the choice of rear wheel instead of the front wheel is for stability (e.g. avoiding '...
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17 votes
6 answers
9k views

Is it bad for the bike to pedal backwards?

Whenever I near yellow or red lights, I slow down and pedal backwards as I coast so that I can continue to get exercise while I wait for the light to turn green before I reach the intersection. (It's ...
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  • 359
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
16 votes
4 answers
2k views

Why use multiple materials on chainrings?

Why is it that on a typical mid-level road triple crankset, the outer rings (larger rings) will be aluminum, while the inner ring (small ring) is chro-mo? It seems to me that if aluminium was good ...
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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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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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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
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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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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  • 1,402
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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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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11 votes
1 answer
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What's this? Photo of bicycle with pedals by the rear wheel

I just stumbled upon this photo of what appears to be a reasonably normal citybike, except it looks like it has a second set of pedals at the rear wheel. source Anybody knows what it is?
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  • 587
10 votes
2 answers
4k views

Broken bottom bracket?

I bought a Trek FX Series 7.5 in April 2017 and ride every day for about an hour. Two weeks ago the crank arms suddenly gave around the bottom bracket and no longer stayed 180 degrees to eachother. I "...
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9 votes
7 answers
18k views

What range of sprockets is useful in a road bike cassette?

My road bike currently has a 27/39/53 crankset and a 13-26 cassette, both of which need to be replaced. I occasionally find myself in both extremes—while heading up the very steep hills of the Bay ...
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9 votes
2 answers
2k views

Does the saddle height need to be changed when the crank length changes?

On my road bike I have 172.5mm crank and my saddle height is 810mm from the bottom bracket. On my track bike I have a crank arm 165mm. Do I need to change the saddle height on my track bike? Will it ...
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  • 336
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
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
9 votes
3 answers
8k views

Chainring rubbing frame after tightening cranks. What should I change?

Bike details: Singlespeed (steel) Square taper threaded BB 58/19 ratio (hence huge chainring rubbing the frame) 130mm bcd 5-bolt crank/chainring Mileage on cranks: several thousand km in all weather (...
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  • 101
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
6 answers
2k views

Group of Bikes: Is 3x1 an option?

I'm an RA for a dorm that is considering buying a number of bikes that would be owned by the dorm and lent out to students. I will be at least in part responsible for maintaining the fleet (about 10 ...
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8 votes
3 answers
3k views

What are the advantages and disadvantages of the different chainset designs?

Over the decades there were many different crankset and especially spider designs: 4, 5 or 6 arm spiders, symmetric or assymetric, different BCDs, direct mount and probably many more. When looking at ...
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  • 639
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
3 answers
17k 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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  • 611
8 votes
1 answer
2k views

How can I keep my chain from derailing from the front sprocket under load?

I've watched the chain derail from the front sprocket, and there is considerable flex that is causing it. I'm a big guy with an athletic build (6'7"/280lbs), and it's a big-box bike, so I'm not ...
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  • 181
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
1 answer
1k views

What is the second thread on the crank for?

I am trying to fix the problem with my bicycle where the left crank keeps unscrewing itself. The thread on which a serrated lock nut should keep the pedal in place is conventional (clockwise to ...
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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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8 votes
3 answers
15k views

Replace crankset or cassette for better road performance on an MTB?

I few years ago I got into cycling again to help keep fit. I still had my mountain bike from when I did some easy trail riding. I'm mainly riding on the road now and I was wondering if I can change ...
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  • 93
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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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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7 votes
3 answers
4k views

Crank arms are not parallel to each other. What could have caused this?

It is a cottered crank. Crank arms themselves don't seem to be bent. It is a non-cartridge style spindle. Any ideas as to why they are not lining up?
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7 votes
2 answers
3k views

Can I run a dual crankset with a chain guide tensioner?

We recently got a new mountain bike for my son via craigslist, it is a couple year old Transition Bottle Rocket and came with a E-Thirteen SS+ chain guide/tensioner. He would like a lower gear for ...
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7 votes
2 answers
11k views

Swapping cranks, but the new crank is wider, how do I compensate for this?

I was swapping the cranks and bottom bracket on my karate monkey from a Truvative stylo crankset (Mountain Double, GXP bottom bracket) to a Race Face Evolution DH (Mountain Triple, Race Face bottom ...
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7 votes
3 answers
905 views

What can I do to fix or replace this broken axle?

I cased a jump badly and I broke either my bottom bracket or crank, I’m not sure which. What can I do to fix or replace this? Picture is of my broken bottom bracket or crankset.
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  • 71
7 votes
1 answer
256 views

How to attach a shimano crank arm power meter on a low end bike with a square taper crankset?

I have an old bike that has a cheap square taper crankset. And I would like to attach a crank arm power meter to it that will fit a Shimano crankset. Is there an adapter that can fit into the square ...
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7 votes
3 answers
6k views

Why does this hollowtech crankset have play?

Background Shimano deore crankset (not XT) The crankset has done about 10000km (6200miles). It is from a touring bike. Most of those 10000km was done with the bicycle loaded (bags on both front and ...
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7 votes
3 answers
2k views

Carbon crank with loose pedal thread

I have a FSA Carbon crank where the thread/bolt for my pedal has become lose and wobbles. In all fairness the crank has has 20,000KM on it. Can it be repaired, can I replace just the crank, or do I ...
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  • 71
7 votes
4 answers
3k views

How do I remove a pedal from a crank with a crossed thread?

I've part stripped, and ultimately crossed the thread on my crank and can't remove my pedal now. This was done whilst riding and then trying to remove the pedal from the damaged crank. I figure the ...
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  • 1,430
7 votes
1 answer
1k views

Is it possible to change the lengths of bike cranks? [duplicate]

ive had debilitating arthritis since I was five and whilst I was younger I enjoyed riding a bike. Unfortunately due to degradation of my hip and lower back joints I am unable to use bikes with long ...
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  • 71
7 votes
5 answers
9k views

Campagnolo 11 speed crank with 10 speed running gear

I currently have an older 10 speed Campagnolo Record group set with 52/39 cranks. I would like to get a compact group set. I can't get an equivalent 10 speed compact cranks now but I can get an 11 ...
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  • 235
7 votes
2 answers
917 views

When did Square Taper Bottom Brackets retire from racing?

I haven't been able to find any hard data on this. I have the impression that most top-end bikes made the switch around the year 2000. It would be great if I could get an answer for both of these: ...
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  • 5,600
7 votes
3 answers
1k views

5 arm cranksets versus 4. Which is better and why?

I'm looking to buy a Sora triple crankset. Shimano make two types, one eith 5 arms, and the other with 4 arms1. Which should I get and why would that be a better choice? I'm a slow-ish rider. I'm 50 ...
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