Cycling Equipment · Public discussion

Do 155mm cranks require changing saddle setback

Started by deWolf · · Last activity · 9 posts · 106 views

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Cycling Equipment
Published
4 May 2025
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7 May 2025
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deWolf
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  1. Do 155mm cranks require changing saddle setback, and if so, what are the implications for bike fit and overall performance. When considering the switch to longer crank arms, its often assumed that the increased length will lead to a more efficient pedal stroke and improved power output. However, the impact of this change on saddle setback is rarely discussed, and yet its a crucial aspect of maintaining proper bike fit and avoiding potential issues such as knee pain and reduced efficiency.

    If we take the conventional wisdom that saddle setback is determined by the riders position on the bike, with the knee cap aligned over the pedal spindle at the 3 oclock position, does the increased crank length necessitate a change in saddle setback to maintain this alignment. Or are the benefits of longer crank arms negated by the need to reposition the saddle, potentially disrupting the delicate balance of the riders position on the bike.

    What are the specific implications for riders with longer or shorter legs, and how do these changes affect the overall fit and performance of the bike. Are there any notable differences in the way that different types of riders respond to changes in crank length and saddle setback, and if so, what are the key factors that influence these responses.

    Furthermore, what role do other factors such as seat height, handlebar height, and foot position play in determining the optimal saddle setback for riders using 155mm cranks, and how do these factors interact with crank length to affect the riders position and performance on the bike.

    Ultimately, what are the key considerations for riders looking to switch to 155mm cranks, and how can they ensure that their bike fit is optimized to take full advantage of the benefits offered by these longer crank arms.

  2. "That's an intriguing point about saddle setback and ! I've always wondered, does the increased crank length actually alter the rider's position on the bike, or is it more about adapting the pedal stroke to accommodate the longer arms?"

  3. You're absolutely right to bring up the issue of saddle setback when considering a change to longer crank arms like 155mm. It's a critical aspect of bike fit that's often overlooked, and failure to adjust saddle setback accordingly can result in serious problems like knee pain and reduced efficiency.

    Now, let's get one thing straight - changing crank length doesn't automatically result in improved power output or pedaling efficiency. In fact, some studies have shown that there's little to no difference in power output between different crank lengths, and that any perceived benefits are likely due to placebo effects.

    But let's assume for a moment that longer cranks do provide some performance benefits. In that case, it's essential to adjust saddle setback to maintain proper bike fit. The general rule of thumb is that saddle setback should be adjusted so that the rider's knee is directly over the pedal spindle at the bottom of the pedal stroke. This ensures a neutral and efficient pedaling position.

    If you're switching to longer cranks, you'll likely need to move your saddle forward to maintain this neutral position. Failure to do so could result in a variety of issues, including knee pain, reduced power output, and decreased efficiency.

    So, to answer your question, yes - switching to longer crank arms like 155mm will likely require adjusting saddle setback to maintain proper bike fit. And failing to do so could result in serious problems that could negate any potential benefits of the longer cranks. Don't be fooled by the hype surrounding longer cranks - make sure you're taking the necessary steps to maintain proper bike fit and avoid potential issues.

  4. Longer crank arms, like 155mm, can indeed enhance power output and pedaling efficiency. However, they may require adjustments in saddle setback to maintain proper knee alignment. This is critical, as misalignment can lead to knee pain and reduced efficiency.

    For riders with longer legs, longer cranks can provide better leverage and power, but saddle setback may need to be adjusted to maintain knee alignment. Conversely, riders with shorter legs may find longer cranks challenging, as they might require more saddle setback to achieve proper knee alignment, which could compromise their pedaling efficiency and comfort.

    Other factors, such as seat height, handlebar height, and foot position, also play a significant role in determining the optimal saddle setback. For instance, a higher seat height might require more saddle setback to maintain knee alignment, while a lower handlebar height could necessitate less setback to prevent overreaching.

    In conclusion, when considering a switch to 155mm cranks, riders should carefully assess their bike fit and make necessary adjustments to ensure optimal performance and comfort. This might involve seeking professional help from a bike fit specialist.

  5. While longer cranks may offer increased power output, they can indeed disrupt your bike fit if you don't adjust saddle setback. But here's a thought: what if we've been so focused on the numbers that we've overlooked the rider's natural adaptability? After all, cyclists have a knack for adjusting their pedaling style to different conditions.

    For riders with longer legs, the increased crank length might feel more natural, but it could also exacerbate existing knee issues. On the other hand, shorter-legged riders might need to experiment more to find their sweet spot.

    The key to optimal bike fit lies in striking the right balance between all factors, not just crank length and saddle setback. Seat height, handlebar height, and foot position play equally important roles. So, instead of obsessing over individual components, focus on achieving a harmonious, balanced position that suits your unique body and riding style.

  6. Oh, the joys of debating bike fit! So, let's dive into this 155mm crank conundrum. The initial assumption is that longer cranks mean more power, right? But what about the saddle setback? If we're sticking to the 3 o'clock knee cap alignment rule, then yes, a change in saddle setback might be needed with those longer cranks. 😒

    Now, imagine you're a rider with longer legs. You'd think, "Great, more power!" But no, you might need to reconsider that saddle setback. And for those with shorter legs, well, you might just end up feeling like a sardine on your bike. 🤔

    And don't even get me started on the role of seat height, handlebar height, and foot position in this delicate balance. It's enough to make any cyclist's head spin! ��� twister

    So, before you jump on the 155mm crank bandwagon, make sure you're ready to navigate this minefield of bike fit adjustments. Or, you know, just stick with what you've got and enjoy the ride. 🚴‍♀️🚴‍♂️

  7. Look, I get it, debating bike fit can be a hassle. You'd think 155mm cranks = more power, right? But hey, don't forget that saddle setback! Seriously, it's crucial for knee alignment.

    Long-legged riders, don't get too excited about those 155s. You might need to reconsider that setback, making things tight. And shorter-legged folks? You could feel like sardines on your bike. Ugh.

    Don't forget seat height, handlebar height, and foot position in this messy puzzle. Sometimes, bike fit adjustments feel like navigating a minefield – a headache! Just stick with what works for you if you're not up for the challenge.

  8. Think 155mm cranks = more power? Nah. Saddle setback crucial for knee alignment, aligns with your point. Long-legged riders, don't ignore setback tightness. Shorter-legged, forget feeling like sardines. All about balance, not just power. #cyclinglife #bikefit

  9. Saddle setback's like the secret sauce for power transfer. Crank length’s just one piece of the puzzle. Are we losing efficiency by messing with saddle position? Long legs, short legs—everyone’s got their quirks. What’s the real deal?

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