What is the longest reach (back of pad) and lowest stack for a 58 P5d with the stock bar? And What about with ex10?

For some reason the fit tool on the Cervelo website is off. For example, 512 stack and 526 reach shows as possible with riser at +1 and pad hole at +45, but the red crosshair on the chart is 10mm to the right of the shaded fit area.

Hi, sorry, was out of town and away from a computer for the weekend.

With a Pad Stack of 630mm and a Pad Reach of 470mm you are squarely in the center of the range for a 56cm P5d.

There's no way I'd prescribe a 54cm. The slightest need for increased reach and you're stuck on a bike that's too small. Any gains from the mono-post situation would be lost by having a sub-optimal position. IOW, I could see you getting slightly longer than where you're at in your picture. Besides, even on a 56cm you'd still have nearly 40mm of exposed mono-riser, so likely avoiding elbow pad/basebar interaction.

On a 56cm, you have the flexibility to get out to a reach of 500mm at a stack of 610mm, ie. 20mm lower than you are now, so plenty of room to grow, and could get significantly lower if need be, not that I think you need to but sometimes when you get longer or shorter cranks it's more comfortable a little lower. But back on point, the extra reach of a 56cm might come in handy as, like me, you ride with your elbows at the front of your tilted pads, perhaps an indicator of needing more reach, which jives with what I'm seeing in the picture.

Speaking of tilt, you'll want the newer model P5d that comes with the EX10 tiltable mono-riser. Provides great fit flexibility.

56cm P5d... make sense?

Eric

Hi Eric,

I've ended up going for a p3x in large (30% discount which swayed me) and LBS have a scheduled build for 14th December due to backlog. I just need to decide on base bar orientation prior to this. Do you or can someone else with knowledge let me know what the drop of the base bar is please?

Again thanks for all your help.

James

Hi

Would I be able to fit on a P5 disc with the standard bars or would I have to change to the p3X bars. Happy for the pads to be a little closer together if that’s the only thing.

I am 177cm height and currently ride a 2019 P2 size 54.

I also currently use 165mm cranks

Saddle height - 734mm

Arm pad reach (BB to back of pad) - 414mm

Arm pad stack BB 699mm

Arm pad width - 280mm

Thank you very much

Thanks for the response. I have been riding road bikes for around 6 year but only started triathlons around 4 years ago. I have done a couple of 70.3's now and am planning on doing a lot more in the future. I did have a fit when i brought the bike but was going more for comfort to be honest as had not been on the tri bars before. I previously used my super six road bikes with extensions.

How low do I need to go for me to fit the 51 or 54.
Here is a terrible pic of me on my P2

Trying to finalize which route to go re: bikes. Likely down to a Cervelo Px (3/5/series) if I go full bike if it works for me, or something like the Tririg Omni if I keep my rim wheels and crankset/PM.

Current Fit (reach is too short) on a size Small Shiv TT. Looking to get longer and tilt the bars.

Pad X Reach (Saddle to back of pads): 490
Pad Y Stack: 620
Pad Z (CtC): 160

SH: 78cm (with 165 crank)

Previous stack as low as 590.

EDIT: Prior to the Shiv TT, I was on a ~2011 P3 56cm. but don't have the measurements for that bike.

Cervelo calculator has me at Size L for the P3x and PX series with room to get longer like I need. Sound right?

Sorry, realized I missed that. Setback is roughly -6 to -6.5cm, and I am riding slack constrained by the frame (and roadie history - originally setup by Joe Santos similar on a P3). Don't have the forward seat post, otherwise would have moved it forward.

PadX from BB right now is 465 to center of pads, around 430 to back of pads.

Hi
Apologies if this has been answered already in the previous 584 posts...

I'm looking at a new P-series.
I have fit co-ords from a previous fit so can suss out stack / reach etc (my current bike does have a limiter that my saddle is as far forward as possible on a relatively slack seat tube angle of 76 degrees and no 'slider' style clamp to offer large ranges of fore-aft. It's just the length of saddle rail for adjustment).
I'm relatively long leg / short torso and arms so a fairly high seat post length - so the seat post setback is more than it would be for someone at 5ft tall at the same angle.)

But one item I can't see or find in the geometry charts is the seatpost angle.
And surely all stack/reach co-ords for sizing the correct bike must have an underlying assumption that you can get the saddle in the right place w.r.t. the BB, particularly the set back.

For ref, my current saddle (adamo Prologue) is 44mm behind the BB centre, measured to the tip of the saddle nose.
Saddle height 811mm BB centre to top surface of saddle measured in the centre (for fore-aft) of the saddle.
175mm cranks.

Or am I worrying about nothing ?

Many thanks.

Hi again.

If I may ask... here goes with my current bike fit numbers, if you could see what size you think I should be on, For a P-Series disc, please.

Height 6 ft 0 (183cm).
Relatively long femur vs everything else.

Saddle. Adamo Prologue (= PL 1.1 in the new range).
Saddle nose 44mm behind the BB.

175mm cranks (but will probably drop to 170mm on a new bike).

Stack - BB to top of arm pads. 435mm

Reach. BB to rear of arm pad. 710mm

Saddle top to arm pad drop, 100mm

Arm pad width (inside edge to inside edge) 85mm.
Aero bar extensions 90mm apart, measured on centre lines.
Outside edge to outside edge of pads 280mm
(Profile Design F35 pad on a J5 bracket)

Saddle distance, BB to top surface of saddle (at saddle centre in fore-aft direction) 811mm on 175mm cranks.

I'm limited in drop / getting low by a long standing neck injury that limits my ability to lift my neck / head upwards/backwards - so too low and I just can't look up to see where I'm going (and think a position where people stare 3" in front of their wheel and not look up the road is a recipe for a big crash - certainly in the UK with the state of the roads, morons in cars etc).

I can see myself maybe getting a bit longer and lower vs the current front end position, but not needing to go any further backwards or up.
(I don't feel cramped and knees are nowhere near hitting my arms, I've done a few IMs in basically this position.

Use of bike - half and full IMs as main target / reason.

(When the neck problem flared up badly a year or two ago I had to resort to a mega-rise stem to do a couple of races - but then all bets were off, it was a really compromised position just to do the event and accept the extra 15 minutes on the bike)

I THINK I'd be on a 56 with quite a few spacers under the arm pads (58 just maybe but probably end up with a short stem).
But want to check / confirm with someone who actually knows.

(Getting a new fit done properly is not possible at present here in the UK which is a PITA due to Covid restrictions).

Thanks very much in advance.

Let me try that one again (sorry I'm an eeejit and had added some figures up the wrong way / written down wrong)

Reach 450mm
Stack 695.

(The reason for the change in numbers : my pads are now 15mm further forward than the fit co-ords I had - my arms are in the same place but the pads further forward on my arms rather than point of my elbow - just more comfy). I added 15mm to the wrong value 😖).

Hi Eric,

In reading through some of the previous responses, I wanted to ask you to confirm my suspicions. So here are the measurements:

Height 180 cm, not long legged, long torso, just medium!

I’m currently on a 7 year old medium QR CD0.1

I’ve changed the stem to a 100mm stem and have a pad x measurement of 645mm and a pad y of 450.

I’m looking to get a p series. I think I would have more flexibility with a 56, but I’m not sure if a 54 would work if I swapped out the stem

Thanks,

My last tri bike was a 2014 P2, size 54. I am signed up for Tulsa next year and went ahead and ordered a 2020 P3 in the same size, but they sent me a 56. I'm curious if anyone can look at my old fit coordinates and tell me if I can make the 56 work or if I need to send it back and get the smaller size. The only reason I ask is b/c I ride a 56 on my gravel bike.

These are old fit coordinates, so probably close, but not perfect as I haven't been on a TT bike in a couple of years.

Stack: 511
Reach: 398

Saddle Height: 764
Nose to Bar: 520
Drop to Pad: 85
Setback from BB: -0.5
Pad Stack/Reach: 643/455
Crank length: 165

FYI, the 56 frame sitting in my office has 170 cranks.

Any thoughts on if I can even get close?