Hey Ian, thanks in advance for all the help you've provided on this forum already.
Unfortunately I don't have coordinates from a former tri bike but I hope you can provide some help anyways.
I'm 189cm / 6'2" tall with a 91cm / 35.8" inseam.
My current bike has a reversible seatpost, which would get me closer to the tri fit, were it not that the saddle height is already maxed out so I can move forward but not up.
I was able to test ride a Cervelo P-Series in size 56 in a bike shop nearby and that already felt much better than my road bike with clip on bars.
The Speedmax CF seems like a much more interesting package overall to me though, so I'm wondering if you can help me figure out what sizing could work.
The P-Series I test rode had quite a bit of exposed seatpost, the saddle was set to 80cm (from BB) and could maybe have gone a little bit higher.
The pads felt best in the most middle position in all directions, so middle fore/aft and middle sideways. Unfortunately the cup had an annoying edge that was messing with my arm near my elbows but that's probably just a pad that doesn't agree with my arms very much.
Position wise it actually felt pretty comfortable without finetuning much so that gives me good hope I can actually get a good fit on the 56 P-Series.
If I do some naive comparison based on the size charts, which probably is not the smartest thing to do, I think I'd end up with a Medium Speedmax CF disc? Medium feels a bit weird though as I happily fit my Grizl in Large.
It seems like the disc models of the Speedmax CF range are quite a bit bigger at the same size than the previous rim brake models.
Hope you can help out, if I can provide any more info then please let me know! :)
Let me say this first - the position your ride on your road bike is (even with the reversible post) probably very different from your optimal TT position. Also, forget the old sizing (56, 58, 60, etc) - most bikes are going with T-shirt sizes now away (SM, Med, LG). As an example QR sizes their bikes by frame stack height (brilliant and deceiving) - you'd fit on a 54. However a tri bike "titles" it's size, what matters first and foremost is the Pad Y and Pad X. That's the determiner.
Based on your morphology I'd put your Pad Y near to 675-685mm and your Pad X around 490-500mm. For the Canyon Speedmax CF you have two options and now-a-days two options is GREAT because bikes are hard to come by...
If you got a size Large with the 90mm stem that comes stock you'd fit nicely with lots of room to move fore-n-aft to detail the cockpit. The pad height on the large bottoms out around 660 - I'm thinkin' you're around 680 so there's some room to go lower but not a ton.
If you got a size Medium with the 80mm stem that comes stock - the pad height would be great, right in the middle with room to go up and down for perfect but I'm worried the cockpit would be too short (max is 495) - if that were the case... you could acquire a 90mm stem from Canyon to get the length needed.
Ian Murray http://www.TriathlonTrainingSeries.com
I like the pursuit of mastery
Twitter - @TriCoachIan