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i Ian.
I have decided on a QR, just not sure which model yet. Probably a PRSix or a X-PR.
I am 5'9" and 85.9cm inseam. About 155lbs. Torso length 57.9cm & arm length 61.1cm.
Pad X: 480
Pad Y: 645
Setback: -45
Seat Height: 767
Thank you so much for your assistance!
Swazi1,
Well, both those bikes are brilliant so you can't go wrong either way...
33+ inch inseam at 5'9" - okay, that's leggy. Almost makes me think your Pad X of 480 is measured to the middle of the pad??? I'm gonna presume so and prescribe from a Pad Y of 645 and a Pad X of 440 (most pads are ~80mm "long" so if I subtrack 40mm I should have a Pad X of 440 to back of pad).
If it's the PRsix... you should get the 52cm bike with a 90mm stem, position the arm pad bracket forward and mount the arm rest in the front hole. Then, there's a "clam shell" with the stem/bar clamp - put that in the mid position (one half of shell on top of base bar and one half below), add in 35mm of pedistal and you're dead-on 650. Here's the wonderful part - let's say I'm wrong about your Pad X and it really is 480 to rear - no worries, it's same bike, same stem but position the arm pad bracket rearward, mount the arm cup in the rear most position and you're at 480.
If it's the X-PR...you've got some choices to make in terms of which front end you choose:
1) Profile-Design 1-Seventeen Stem with PD Sonic 35A aerobars: "mortal" stem, aluminum aerobars, super easy to adjust.
2) PD 1-17 stem again but now with PD Supersonic Ergo 35SLC: "mortal" stem, carbon aerobars, my favorite bracket, brilliant
3) Quintana Roo Aero Stem with the PD Aeria Ultimate front end: "super" set up now with all lines hidden and very sexy.
- there's something to be said about BTA (Between The Aerobars) hydration that goes with these set ups. #3 has the super high-tech hydro thang while #s 1&2 have a more common BTA. Both give you want you need in terms a straw in the face as a constant reminder to drink, refillable, computer ready, etc.
If you do the PD 1-17, Sonic 35a's or the Sueprsonice (#1 or 2 above) get the 54cm with a 110mm stem set in the -17deg position, put 5mm spacer under the stem, 20mm in aerobar pedistal, then mount the pads dead center for 480 to rear and mount 'em all the way back for 440 or some where in between to find your spot
If you go with the QR aero stem and the Aeria Ultimate front end... get the 54cm bike with a 90mm stem. Now you have some choices to make: 1) put the clam shell doubled up below the base bar then add 20mm spacer under stem and 20mm of aerobar pedistal, 2) put the clam shell half above, half below and do 10mm of spacer under stem and 30mm pedistal, or 3) put both halfs of the clam shell atop the bar, slam the stem, and do 40mm of pedistal under the aerobar. All three of those prescriptions result in the same Pad Y of 645. Then pads are mounted slightly foward of center to get 480 or three holes in front of max-back to get 440.
Ian
PS. If it were an athletic racer it'd do #3 in the above paragraph and if it were a less skilled rider I'd do #1 in the above.
Ian Murray
http://www.TriathlonTrainingSeries.com I like the pursuit of mastery
Twitter - @TriCoachIan