I have 50.5 cm reach to back of pad on a 54 p5d, using p3x cockpit (and revolver mono blackbird armrest).

I was in an accident last summer where the fork on my bike snapped just under the stem, sending me flying at quite some speed. I had quite a long stem which probably leveraged a lot of force to the fork when hitting a pot hole, damaging the carbon.

After that I've been looking at bikes that are built without a stem being mounted to the fork but with an integrated stem. It just feels more safe. Problem is I ride quite long and low and it's hard to find bikes like that to my fit numbers.

Until I looked into the P5d. First it seemed too short, but then I noticed that the reach spec is to the back of the pad. So I was hoping to get some help from someone who knows if my assumptions described below are correct?

I've had a bike fit done and I have the saddle at 765mm (172,5 cm crank arms) and at -50mm from BB. My arm pad stack is 625 and my arm pad reach is 535 to center pad. I'm 181cm tall.

Translated to the tool on the cervélo official site, I interpret that my numbers are equivalent to a pad stack of 625 and a pad reach of 490, since these measurements are to the back of the pad? Many pads seem to be around 90mm, so a deduction of 45mm is reasonable when comparing the numbers?

If I have the above assumptions right, then I would be able to fit into both a size 56 and a size 58? My stand over height is limited at 82 which also is fine with the 80,4 on the size 58.

So from the above numbers, I reckon a size 58 would fit me the best, leaving my elbows pretty much in the centre reach-wise and being 42 yo it's not likely I'm gonna need to get any lower.

Sorry if you've answered this elsewhere, but how did you get the EX-10 monoriser on your P5d?

thanks,
Eric

Edit: Also, your equipment choice deserves a pic!

I am between 6'3 and 6'4 (192cm). I like the P5 Disc and would be (grudgingly) prepared to spend extra on the EX-10 riser that I would definitely need for the pad width. However I also spotted that the basebar is only 38cm wide in all frame sizes and unless I am mistaken it cannot be swapped. I have broad shoulders and my handlebar on the road bike is 44cm. Is it a reasonably safe assumption that this will be a very unhappy relationship with the basebar and the P5d is just not for me?

Since the Cervelo Aerobottle is kind of useless I turned it into a toolkit. Here are the pictures of how I did it in case anyone is interested

I don't understand why people find it useless... it's not the greatest but you can work with it pretty good.

Just managed to finish my fitting with the PX cockpit. That makes it a new world for me, much better position (just waiting for tririg cups to arrive and that will be a finish to the position). Wanted to post a video but don't know how to... but really recomend this setup if you need tilt or some extra comodity.

Now deciding between POC cerebel vs Giro Aerohead (probably will go with the POC)

I am between 6'3 and 6'4 (192cm). I like the P5 Disc and would be (grudgingly) prepared to spend extra on the EX-10 riser that I would definitely need for the pad width. However I also spotted that the basebar is only 38cm wide in all frame sizes and unless I am mistaken it cannot be swapped. I have broad shoulders and my handlebar on the road bike is 44cm. Is it a reasonably safe assumption that this will be a very unhappy relationship with the basebar and the P5d is just not for me?