Whats with the magic numbers and folklore surrounding crank length and its supposed effect on suspension feel on mountain bikes? Is it just a case of more is better or is there actual science backing up the claims that longer cranks make your suspension feel like its sucking up every bump on the trail, while shorter cranks make it feel like youre riding a jackhammer?
Weve all heard the arguments about how crank length affects the leverage ratio of the pedal stroke, and how thats supposed to translate to the suspension feeling more or less sensitive. But how much of that is actually based on real-world testing, versus just hearsay and anecdotal evidence from guys who rode 180mm cranks back in the day and swear they felt like they were floating over rocks?
I mean, think about it - were talking about a tiny change in the length of a crankarm, a few millimeters at most, and yet its supposed to have a profound effect on the way the suspension feels. Is that really possible, or are we just getting caught up in a bunch of hand-waving and marketing nonsense?
What if we were to take a completely different approach, and design a bike around a crank length thats optimized specifically for suspension feel, rather than just using whatever length happens to be fashionable at the moment. Would we see a revolution in suspension design, or would it be just another gimmick?
Can anyone actually explain, in simple terms, how crank length affects the suspension feel on a mountain bike, or is it just a case of because I said so? Maybe someone can point me to some actual research or testing data that shows a clear correlation between crank length and suspension feel. Until then, Im just not buying it.