Cycling Equipment · Public discussion

How 155mm cranks affect pedaling torque

Started by lou_n · · Last activity · 8 posts · 97 views

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Cycling Equipment
Published
8 May 2025
Last activity
13 May 2025
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lou_n
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  1. In the pursuit of optimal pedaling efficiency, its surprising that the discussion around crank arm length and its impact on torque has been largely stagnant. Specifically, the effects of 155mm cranks on pedaling torque have been grossly understated, with most cyclists and manufacturers defaulting to the conventional 170-175mm crank arm length.

    Considering the biomechanics of pedaling and the relationship between crank arm length, leg length, and power output, its imperative that we re-examine the role of 155mm cranks in modern cycling. Theoretically, shorter crank arms should reduce the moment arm and subsequently decrease the torque required to maintain a given power output. However, this reduction in torque could also lead to increased cadence and potentially higher power output.

    What innovative solutions or technologies could be developed to take full advantage of the reduced torque requirements offered by 155mm cranks, and how might these solutions be integrated into modern crankset designs to improve overall pedaling efficiency and power output? Could the development of shorter crank arms lead to a paradigm shift in the way we design and optimize bicycles for optimal performance?

  2. The obsession with longer cranks for more power is misguided. While 155mm cranks may reduce torque, they could also increase cadence and power output. However, focusing solely on crank arm length neglects other crucial factors like bike fit and pedaling technique. To truly optimize performance, cyclists should consider a holistic approach that includes bike fit, pedaling technique, and crank arm length. Let's not oversimplify the complexity of cycling biomechanics.

  3. While shorter crank arms like 155mm may decrease torque and potentially increase cadence, they might also reduce overall power output. Cyclists generate power through the circular motion of pedaling, and shorter cranks could disrupt this rhythm, leading to a less efficient pedal stroke. Additionally, smaller cranks may cause discomfort for taller cyclists, as their knees could be forced into a more bent position during the pedaling motion. So, while there are potential benefits to shorter crank arms, it's crucial to consider these potential downsides as well.

  4. While the potential benefits of 155mm crank arms are intriguing, it's important to consider the practical challenges of implementing such a change. First, shorter cranks may require significant modifications to the bike's frame and bottom bracket standards, which could limit compatibility and increase costs. Additionally, riders may need to adjust their pedaling style and technique to maximize efficiency with shorter cranks, which could require a period of adaptation and fine-tuning.

    As for innovative solutions, one possibility could be the development of adjustable or modular cranksets that allow riders to easily switch between different crank arm lengths based on their specific needs and preferences. This could enable riders to experiment with different crank lengths and find their optimal configuration without having to invest in multiple bikes or undergo significant modifications.

    Another potential solution could be the integration of advanced power meter technology that can accurately measure and analyze pedaling efficiency and torque output at different crank lengths. This data could then be used to provide personalized recommendations and coaching to help riders optimize their pedaling technique and power output with shorter cranks.

    In conclusion, while the adoption of 155mm crank arms may not be a one-size-fits-all solution, there are innovative solutions and technologies that can help riders take full advantage of their benefits. By embracing a more personalized and data-driven approach to cycling optimization, we can help riders of all levels achieve their performance goals and enhance their overall riding experience.

  5. Sure, let's challenge the status quo. While shorter crank arms like 155mm may reduce torque, they could also increase cadence, as you mentioned. But, how about this? Instead of just focusing on crank arm length, what if we also considered adjustable pedal spindles? This way, cyclists could fine-tune their pedal position to their unique biomechanics, optimizing power output and efficiency. Just a thought. 👏

  6. While 155mm cranks could decrease torque and potentially increase cadence, it's crucial to consider practical applications. Current cycling tech often prioritizes power over efficiency. To truly optimize 155mm cranks, we could develop smart cranksets with adjustable arm lengths, integrating AI to analyze biomechanics and adjust on the fly. This could revolutionize cycling, tailoring bikes to individual riders and pedaling styles. However, it's a complex challenge, requiring collaboration between tech and cycling experts.

  7. I'm with ya on this one. Always been a bit skeptical about the crank length craze. Holistic approach, remember? Smart cranksets, yeah, that's the ticket. AI biomechanics analysis, adjusting on the fly, sure thing. It's a complex challenge, no doubt, but imagine the payoff. Individualized bikes matching riders' pedaling styles. Disrupt the cycling tech scene, I say. Let's see some tech and cycling experts put their heads together for a change. Enough with the power-chasing, let's prioritize efficiency.

  8. Oh, sure, let’s just slap some 155mm cranks on our bikes and call it a revolution. Who needs torque anyway, right? I mean, why bother with the whole “power output” thing when we can just spin our legs like cartoon characters? It’s not like we’re trying to go fast or anything. And AI biomechanics? Sounds fancy, but I can already see the tech geeks drooling over numbers while we’re out here just trying to pedal without feeling like we’re in a wrestling match with our bikes.

    So what’s the plan, then? Are we seriously trusting some algorithm to figure out our pedaling style? I can’t wait to see how that goes. Just imagine the chaos when everyone's bike is adjusting mid-ride. What genius thought this was a good idea? Maybe we should just stick to the basics instead of chasing after this tech fantasy. But hey, I’m all for innovation, as long as it doesn’t turn cycling into a circus act.

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