Guess this is more of a bike fit question but it involves my PM.
My Quarq PM is compatible with the stock sworks 172.5 crank that came with my bike. I am pretty sure I am going to order a shorter 170mm FSA SL-K crank & here is why...
Received a bike fit from the shop where I purchased my 54cm bike. Looking back now, it is clear that these people should not be fitting anyone one a bike. Clueless would be an understatement after recently experiencing a Retul bike fit.
After riding a few months I began experimenting on my own with stem height/length and seat height/fore & aft. Using a plumb bob I figured out that the Sworks seat post with a 20mm setback did not allow me to move my saddle far enough forward to get my knee (I measured just behind the patella & try to intersect the plumb bob with the pedal axle).
So, I purchased a "Zero Setback" seat post that allows me to get much closer to a correct position as verified with a 3-D Video Retul bike fit I received two weeks ago. However, even with the new seat post my saddle is almost all the way forward & my shoe cleats are all the way forward to get my knee in the correct location.
I dislike the fact that the cleat position could be putting too much pressure toward my toes and not the ball of my foot as well as having the seat post so far forward makes me think there could be a little flex in the saddle rails & just not the optimal position.
So.....Here is my thought. I would gain 2.5mm of adjustabilty by moving to the shorter 170mm crank. I've run many of the suggested "crank length calculator equations" and the numbers imply there would be no performance loss with the 170mm crank.
Forget about the cost factor. Optimizing my fit to prevent injury is more important than dollars.
Lastly, I will have to send my PM back to Quarq to be calibrated for the new crank, correct?
I believe the bad news is that what all of the data is telling me is that my 54cm frame is too large???? Damn that is an expensive mistake. If that is true, I would love it if Specialized would hold their dealers accountable for selling an $8,000.00 bike to a customer in the wrong size and provide me with a proper sized frame.
Hmmm, maybe I will forward this to the Specialized customer support?
Thanks for your input.
My Quarq PM is compatible with the stock sworks 172.5 crank that came with my bike. I am pretty sure I am going to order a shorter 170mm FSA SL-K crank & here is why...
Received a bike fit from the shop where I purchased my 54cm bike. Looking back now, it is clear that these people should not be fitting anyone one a bike. Clueless would be an understatement after recently experiencing a Retul bike fit.
After riding a few months I began experimenting on my own with stem height/length and seat height/fore & aft. Using a plumb bob I figured out that the Sworks seat post with a 20mm setback did not allow me to move my saddle far enough forward to get my knee (I measured just behind the patella & try to intersect the plumb bob with the pedal axle).
So, I purchased a "Zero Setback" seat post that allows me to get much closer to a correct position as verified with a 3-D Video Retul bike fit I received two weeks ago. However, even with the new seat post my saddle is almost all the way forward & my shoe cleats are all the way forward to get my knee in the correct location.
I dislike the fact that the cleat position could be putting too much pressure toward my toes and not the ball of my foot as well as having the seat post so far forward makes me think there could be a little flex in the saddle rails & just not the optimal position.
So.....Here is my thought. I would gain 2.5mm of adjustabilty by moving to the shorter 170mm crank. I've run many of the suggested "crank length calculator equations" and the numbers imply there would be no performance loss with the 170mm crank.
Forget about the cost factor. Optimizing my fit to prevent injury is more important than dollars.
Lastly, I will have to send my PM back to Quarq to be calibrated for the new crank, correct?
I believe the bad news is that what all of the data is telling me is that my 54cm frame is too large???? Damn that is an expensive mistake. If that is true, I would love it if Specialized would hold their dealers accountable for selling an $8,000.00 bike to a customer in the wrong size and provide me with a proper sized frame.
Hmmm, maybe I will forward this to the Specialized customer support?
Thanks for your input.