Pudding86 wrote:
Hi Eric!
I’m looking for a new bike and trying to choose between the PX or the P5 disc.
Here is my measurement:
Height: 177cm
Inseam: 84cm
Pad X: 58cm
Pad Y: 45cm
Pad Z: 21cm (center to center)
Saddle height: 74,5cm
Saddle setback: 5cm
My current bike is a BMC TM01 2015, size M-S and it’s a little small for me. My bikefitter wants me to get a little more playroom in reach (forward). I’ll attach a picture of my current position.
My own conclusion is size M in PX for some playroom in reach. And size 51 or 54 in P5d with EX10 for tilt and more reach. What is your recommendation?
My main races is half-IM and IM but sometimes I like to compete in lokal TT-races in my triathlonclub (I’m often at the top in the results). The P5d is faster but the PX is a little more comfortable?
Thanks in advance!
hi, thanks for reaching out. FWIW, I always disliked the M-S BMC knowing that there was a M-L out there.
I think you have your X and Y backwards, so I'm going to proceed presuming you have a pad stack of 580mm and a pad reach, to *back* of pad, of 450mm.
With those fit coordinates, I'd also conclude a size M PX bike would be best. The size S would fit, but you couldn't get much longer, whereas the M you can get a little bit lower and reasonably longer if need be, especially considering your comment about feeling like your current bike is a little small for you and seeing the picture.
The P5d is a little more complicated. I don't know that I'd lean toward a 54cm... you'd be in the lower left quadrant with only 5mm of stack to play with whereas the 51cm would give you 25mm of reach and 25mm of stack to play with. You'd need to *know* that your future position would be zero mm lower and more than 25mm longer to make me feel comfortable that you'd need the 54cm.
Can you confirm that my presumption is correct about your fit coordinates and that they're to the back of pad?
Does the PX and P5d advice make sense?
Eric
Eric Reid
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