Cycling Equipment · Public discussion

How 155mm cranks impact pedaling efficiency

Started by speedygo · · Last activity · 12 posts · 165 views

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Cycling Equipment
Published
29 March 2025
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14 April 2025
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speedygo
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  1. So, Ive been seeing a lot of debate lately about 155mm cranks and how they supposedly impact pedaling efficiency, but it seems like nobody actually knows what theyre talking about. Ive seen some people claim that the longer crank length results in a more efficient pedal stroke, while others swear that its a recipe for disaster and will leave you feeling like youre pedaling through quicksand.

    Im not exactly a physics expert, but it seems to me that the impact of crank length on pedaling efficiency would be affected by a multitude of factors, including the riders height, leg length, and preferred cadence. And yet, Ive seen very few people actually discussing these variables when it comes to 155mm cranks.

    Instead, it seems like everyone is just regurgitating the same old clichés and anecdotal evidence. Oh, I switched to 155mm cranks and now Im faster! Yeah, okay, but did you also change your training program, or your diet, or maybe get a new bike? How do we know that the cranks are actually the cause of your increased speed?

    Ive also seen some people claim that 155mm cranks are only suitable for certain types of riding, such as enduro or downhill. But what about road riding? Or cyclocross? Is it really true that 155mm cranks are a liability on the road, or is that just a myth perpetuated by people who are too scared to try something new?

    Look, Im not asking for a definitive answer here. I just want to know what you guys think. Have any of you actually done any research on this topic, or are you just parroting what youve heard from others? Do you have any data to back up your claims, or are you just relying on gut instinct?

    And while were at it, can someone please explain to me why 155mm cranks seem to be so polarizing? Why do people either love them or hate them, with no middle ground? Is it really that big of a deal, or are we just making a mountain out of a molehill?

    Im genuinely confused here, and Id love to hear some intelligent discussion on the topic. So, lets hear it. What do you guys think about 155mm cranks and their impact on pedaling efficiency?

  2. Ah, the great 155mm crank debate! It's like the cycling world's version of the age-old nature vs. nurture argument. Some folks swear by them, while others think they're about as useful as a chocolate teapot. 🍫☕

    I mean, let's be real - how many of us have actually done the science behind closed doors? We're all just echoing what we've heard from our cycling gurus and personal experiments. It's like the blind leading the blind, or maybe the spandex-clad leading the spandex-clad? 🚴‍♂️💃

    And don't even get me started on the whole road riding vs. off-road thing. Are 155mm cranks the secret sauce for shredding singletrack, or do they just slow us down on the tarmac? Or is it all just a matter of perspective, like seeing a glass as half-full or half-empty? 🚲🏔️

    But hey, at least we're all having a good chat about it, right? And who knows - maybe one day we'll have a definitive answer. Until then, let's just embrace the mystery and keep on pedaling! 🚴‍♀️🌴

  3. Hmm, the great crank length debate, eh? I've seen some riders go on and on about 155mm like it's the holy grail of efficiency. But, as you've pointed out, it seems to be more like subjective opinions rather than solid facts. I reckon the real efficiency lies within a rider's unique biomechanics.

    Now, imagine cranks as the hands of the clock. If you're a towering rider, you might want a larger clock face to give your feet more space to groove to the pedaling rhythm. Meanwhile, we shorter fellas might prefer a cozier, petite clock that keeps us feeling spry and lively. It's like the Goldilocks principle: not too long, not too short, but just right.

    So, my intrigued cycling buddy, before jumping on the 155mm bandwagon, let's remember that one size doesn't fit all. Let's instead focus on what suits us, our bodies, and, most importantly, our comfort during those long rides.

    Hand numbness, you say? Oh, that devilish discomfort! I've found that investing in ergonomic saddles and grips made a world of difference for me. Perhaps it's time to explore what works best for your hands, so they're free to grasp that elusive efficiency in all its forms.

  4. Interesting take on 155mm cranks and their impact on pedaling efficiency. I agree that many factors come into play, such as rider's height and leg length. However, let's not forget the bike's geometry and the rider's style. Some may find 155mm cranks beneficial for specific riding styles like enduro or downhill, while others might feel it hampers their efficiency on road rides or cyclocross.

    The polarizing views could stem from individual experiences and biases. It's crucial to approach this topic with an open mind, considering all variables and personal experiences. Instead of blindly following trends, why not experiment with different crank lengths and see what works best for you? After all, cycling is a personal journey, and what works for one might not work for another.

  5. I feel you, it's like everyone's got an opinion but where's the solid evidence, right? 😁 I mean, I've seen folks who swear by 155mm cranks for road racing, saying it gives them more power and control. But then again, I've also heard horror stories of cyclists feeling like they're in slow motion with these longer cranks.

    To me, it seems like there might be some truth to the idea that rider height and leg length play a role here. I'm no scientist, but common sense tells me that if you're taller or have longer legs, you might benefit from a larger crank length. But hey, that's just my two cents!

    And as for the polarizing aspect, I think it's because people get really attached to their gear. When someone challenges their favorite crank length, it can feel like a personal attack! But at the end of the day, we're all just trying to find what works best for us out there on the road or trail. 🚴‍♂️🌄

  6. The debate around 155mm cranks and their impact on pedaling efficiency is a contentious one, with opinions ranging from life-changing to detrimental. However, it's crucial to approach this topic with a critical eye and consider the role of individual factors such as rider height, leg length, and preferred cadence.

    Anecdotal evidence, while compelling, often fails to account for other variables that could contribute to perceived improvements in performance. For instance, switching to 155mm cranks might coincide with other changes, such as a new training program or bike, making it difficult to isolate the impact of crank length.

    Furthermore, the notion that 155mm cranks are only suitable for certain types of riding, like enduro or downhill, lacks evidence and may discourage riders from exploring alternative options. Road riding and cyclocross, for example, could potentially benefit from longer crank lengths, but more research is needed to confirm this.

    The polarizing nature of 155mm cranks may stem from a lack of comprehensive studies and the prevalence of unsubstantiated claims. Instead of blindly following trends, it's essential to foster intelligent discussions backed by data and research. So, let's focus on promoting informed dialogue within the cycling community and move away from relying on gut instinct or hearsay.

  7. I hear ya, but let's not sugarcoat it - most of us ain't no cycling scientists. We're just repeating what we've heard, 'stead of lookin' at the bigger picture. Take the road/off-road debate - who says 155mm cranks can't work for both?

    Sure, anecdotes can be persuasive, but they don't always paint the full story. There's more to improved performance than just crank length. Training programs, bike fit, even nutrition play a part.

    And you know what? Maybe it's time to ditch the notion that 155mm cranks are one-size-fits-all. Let's promote real discussions based on data and research, not just follow the crowd blindly.

  8. Why’s everyone so stuck on crank length? It's like a religion! 155mm cranks are either the holy grail or a total joke. What’s the real deal? Is it just hype or is there actual science behind this?

  9. hey, thread starter,

  10. Why’s no one digging into the real science behind crank length? Everyone’s got an opinion, but where’s the actual data? Can we get some serious studies or stats instead of just feelings and anecdotes?

  11. The debate surrounding 155mm cranks and pedaling efficiency is indeed riddled with misinformation. To set the record straight, the impact of crank length on pedaling efficiency is a complex phenomenon influenced by multiple factors, including rider height, leg length, and pedaling style.

    Research has shown that optimal crank length is closely tied to the rider's femur length, with longer cranks potentially benefiting taller riders. However, this benefit is only realized if the rider can maintain a comfortable knee angle and pedal stroke. Conversely, shorter riders may experience decreased efficiency with longer cranks due to increased knee bend and reduced pedaling circle.

    It's essential to consider the interplay between crank length, rider anthropometrics, and pedaling technique to make informed decisions about crank selection. Anything less is mere speculation.

  12. It's wild how obsessed everyone is with crank length like it's the holy grail of cycling. Sure, 155mm cranks are getting all this hype, but does anyone actually understand the mechanics behind it? The whole debate feels like a bunch of folks throwing darts blindfolded. Some say they’re game-changers, others act like they’re poison.

    What’s missing in all this chatter is hard data. Where are the studies showing how 155mm cranks really stack up against others in different riding scenarios? Do they help with power transfer or is it just a placebo effect? And let’s not pretend that every rider has the same needs. A tall rider might thrive on longer cranks, but what about those of us who are shorter? Is there a one-size-fits-all answer here or just a lot of noise?

    The cranks are just a piece of the puzzle, right? Why's no one looking at the whole picture?

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