Speedi Posted September 2, 2008 Share ?Ok' date=' well if crank length is so unimportant, then why is it linked to knee problems etc. I think it makes quite a difference... Spoke to a well known cyclist earlier, and he said it would make a difference and you can feel it. Before calling it "irrelevant to you and I", do some research.[/quote'] ? Knee problems are mostly attributed to to saddle height and pedal float issues. ? Crank length can be related to stride length or step height. The human anatomy is quite tolerant to relatively small differences. We can run up and down stairs of varying height and adapt stride to fall in pace with others (soldiers marching) with no ill effect. Short people don't require different stairs than tall people. Even very tall people will only run up stairs two at a time, not three at a time.? Observe and you'll believe. ? ? The same goes for cranks. The difference between a circle with a radius of 172,5mm and 175mm is 1,4%. The difference between a 6-footer and a 5'-6 incher is far more than that with no ill effect when using the same crank. ? I have seen no study that links knee problems to small differences in crank lengths, nor have I seen studies to link optimised power output to optimised crank lengths (within 2.5mm). ? However, I have no doubt you can "Feel" the difference. Perhaps you'd like to take me up by participating in my blind crank length experiment. Let me know and I'll set it up.?The cost is a case of beer and a result made public here on The Hub. ? But now that I'm talking to you I just remembered something. You gave out some advice regarding 1,8mm spokes somewhere but ignored my question. Please let us know why 2mm spokes are stronger than 1,8mm spokes as you suggested. ? Oh, and why not tell us how you arrived at the proper crank length for your particular anatomical needs? We're all ears. ? ? ? ? ? ? ? Ok thanks. Spokes? No never said anything about 2mm spokes being stronger... I dont know too much about spokes. Maybe try find the thread and link it here. Link to comment Share on other sites More sharing options...
Speedi Posted September 2, 2008 Share CYCLING PERFORMANCE TIPS Cranks, Crank Length, and Pedals CRANKS Crank Length Decisions on appropriate crank length are often steeped in mystique and considered part of the "art" of coaching for the competitive cyclists. Knee pain, especially chondromalacia, is often an indicator that your crank length is incorrect for you. Link to comment Share on other sites More sharing options...
Speedi Posted September 2, 2008 Share Sorry, crank length is sometimes linked to knee pain. Link to comment Share on other sites More sharing options...
Speedi Posted September 2, 2008 Share Crank length calculator Speedi2008-09-02 01:41:27 Link to comment Share on other sites More sharing options...
Canaris Posted September 2, 2008 Share I don't know about the blade compatibility. The Shimano gurus will tell you that. However' date=' the crank is fine. The difference is very small and very few people can tell whether they're riding a 172.5 or 175mm crank without looking. I have a 165 on my stationery bike and I'm none the poorer or wiser. Crank lengh relates to femur length, not body length. But forget all this, if a specific crank pops up that you want, get it. The length is irrelevant to you and I. Cranks require no maintenance. [/quote'] Johan and I agree on something. DO I win a prize? Link to comment Share on other sites More sharing options...
Johan Bornman Posted September 2, 2008 Share Johan and I agree on something. DO I win a prize? Oh yes, and here it is. Collect them, six of them can be exchanged for a beer. Link to comment Share on other sites More sharing options...
Canaris Posted September 2, 2008 Share knee pain and crank leangth. Commonly held belief is that the knee is at its most vulnerable when placed under load at an angle(bend) greater than 90 degrees. therefore if your saddle is to low or cranks too long (but very long) your knee will bend more than 90 degrees and be placed under load as you pedal. that is the logic of the statement. I hand back to Johan now........... Link to comment Share on other sites More sharing options...
Canaris Posted September 2, 2008 Share Johan and I agree on something. DO I win a prize? Oh yes' date=' and here it is. Collect them, six of them can be exchanged for a beer. [/quote'] one down five to go. How many for a free wheel building course? Link to comment Share on other sites More sharing options...
AuctionLamb Posted September 2, 2008 Share Johan and I agree on something. DO I win a prize? Oh yes' date=' and here it is. Collect them, six of them can be exchanged for a beer. [/quote'] very sharp!!!! Link to comment Share on other sites More sharing options...
Alida Posted September 2, 2008 Share Hey ... according to that crank length calculator I need 177.5 mm cranks. And then if you go to the link to calculate my bike size I need a bigger bike too. I ride 175 mm cranks on 57 frame and it works for me. Have ridden a 60 frame (when I just started and only used my inseam measurement to buy a bike), a 58 frame (when I realised the 60 frame was just too big) and a 56 frame before I settled on this one so I know that what I've got works for me. Wouldn't put too much stock in the whole calculation - I ride the best where I'm the most comfortable. Link to comment Share on other sites More sharing options...
JasonW Posted September 2, 2008 Share Would it be correct that in order to do the same work, in the same time, on a shorter crank, you would need a higher cadence? Link to comment Share on other sites More sharing options...
Canaris Posted September 2, 2008 Share Hey ... according to that crank length calculator I need 177.5 mm cranks. And then if you go to the link to calculate my bike size I need a bigger bike too. I ride 175 mm cranks on 57 frame and it works for me. Have ridden a 60 frame (when I just started and only used my inseam measurement to buy a bike)' date=' a 58 frame (when I realised the 60 frame was just too big) and a 56 frame before I settled on this one so I know that what I've got works for me. Wouldn't put too much stock in the whole calculation - I ride the best where I'm the most comfortable.[/quote'] so you are very tall then? Link to comment Share on other sites More sharing options...
Johan Bornman Posted September 2, 2008 Share Ok thanks. Spokes? No never said anything about 2mm spokes being stronger... I dont know too much about spokes. Maybe try find the thread and link it here. Sorry, my mistake. Apologies. I'm getting my fast guys confused. Speedy, Racer X - sounds very similar, doesn't it. I was referring to this thread but as I said, it wasn't you. Sorry. https://www.bikehub.co.za/forum_posts.asp?TID=31951&KW=revolution&PID=515694#515694 Link to comment Share on other sites More sharing options...
Alida Posted September 2, 2008 Share Hey ... according to that crank length calculator I need 177.5 mm cranks. And then if you go to the link to calculate my bike size I need a bigger bike too. I ride 175 mm cranks on 57 frame and it works for me. Have ridden a 60 frame (when I just started and only used my inseam measurement to buy a bike)' date=' a 58 frame (when I realised the 60 frame was just too big) and a 56 frame before I settled on this one so I know that what I've got works for me. Wouldn't put too much stock in the whole calculation - I ride the best where I'm the most comfortable.[/quote'] so you are very tall then? 1.84 m - they just don't make WSD bikes for ladies like me Link to comment Share on other sites More sharing options...
Johan Bornman Posted September 2, 2008 Share Would it be correct that in order to do the same work' date=' in the same time, on a shorter crank, you would need a higher cadence?[/quote'] This is a Chinese puzzle. Hou kop. Your cadence would remain the same but you would have to apply more pressure throughout the pedal stroke. The upside is that your legs would travel a slightly shorter distance around the smaller circle. Link to comment Share on other sites More sharing options...
jabbathemutt007 Posted September 2, 2008 Share http://www.ncbi.nlm.nih.gov/pubmed/11417428Has anyone with a powermeter compared different length crank arms? Pleeeease... so this "feel" thing can be put to rest. http://www.ncbi.nlm.nih.gov/pubmed/11417428 Link to comment Share on other sites More sharing options...
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