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Low Stack Aero Bars/Systems
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I've traded a couple of emails with Slowman about the Profile Aeria Ultimate. Posting here instead of the main forum.

I'm looking for a low stack aero bar set up for an athlete. Probably she should have a 48cm P3, but is on a 51cm. The stock 3T Aura Pro are too tall, and I'd like to be able to tilt the extensions if it is an integral set. I'd have to check since the fit was done back in August, but I think that she's on no spacers and a flat stem right now. I don't know if I want to go to an adjustable stem.

We're looking at the existing TriRig and the newer Profile Aeria Ultimate. Are there any others that need to be considered...Enve, HED, other 3T model?


Brandon Marsh - Website | @BrandonMarshTX | Cervelo | RokaWetsuits | 1stEndurance |
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Re: Low Stack Aero Bars/Systems [-BrandonMarshTX] [ In reply to ]
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What are her coordinates?
Pad XY (to back, incl cushion)
Pad Width (centres)
Aerobar length (back of pad to tip of extensions)


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Re: Low Stack Aero Bars/Systems [-BrandonMarshTX] [ In reply to ]
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How low is low?

Is something like the Profile Design V+ series adequate?

Travis Rassat
Vector Cycle Works
Noblesville, IN
BikeFit Instructor | FMS | F.I.S.T. | IBFI
Toughman Triathlon Series Ambassador
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Re: Low Stack Aero Bars/Systems [cyclenutnz] [ In reply to ]
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I'll check, I don't have pad x/y. But, once the bike is back from tri bike transport I can get that.

I put a -25 degree, 105mm stem on the bike (P3). Again, keeping the basebar flat and tilting the bars/pads is one adjustment that the 3T bars on it lack.


Brandon Marsh - Website | @BrandonMarshTX | Cervelo | RokaWetsuits | 1stEndurance |
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Re: Low Stack Aero Bars/Systems [-BrandonMarshTX] [ In reply to ]
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A bit of surmise required here while we wait for more data
Assuming 9mm headset cover, 3T Aura Comfort with pads in back position (and just using the base pad position - ignoring the reach and stack impact of wider pad positions) would give PXY:
432,598
Or an Aerobar XY of 35,92

Using an XY tolerance for search of 5mm:

PD Aeria Ultimate would have space to go down another 20mm - so decent clearance between basebar and pads
Enve SES with team stem can also hit the XY in overmount position, but is very limited for pad width so that is something to watch for
Can just hit that XY on Tririg Alpha X with tilt bracket and Ergo pads and overmount. Don't want undermount as then the pads don't tilt

To get low stack on Zipp you lose the tilt, would need full coordinates to calculate for Vuka Aero
Hed not really in the picture compared to the adjustability of other brands now.


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Re: Low Stack Aero Bars/Systems [cyclenutnz] [ In reply to ]
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These measurements were not by me. Here is the reply:

If we did this correctly, x=18 inches (~45.72 cm) and y=22.75 inches (~57.785 cm)

Any advice or suggenstions on a bar replacement for the 3T Aura on the P3 would be great.


Brandon Marsh - Website | @BrandonMarshTX | Cervelo | RokaWetsuits | 1stEndurance |
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Re: Low Stack Aero Bars/Systems [-BrandonMarshTX] [ In reply to ]
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Are the Aura bars tilted up at all? That would make a difference to the stack calculation.
Is it possible to get a pic of the bike?

Closest the Aeria Ultimate can get is 454, 585 if the pads are flat and you use an STS type headset cover
TR Alpha X can't get there overmount
TR Alpha one can get there in the totally slammed position
Best Enve can do overmount is 448,584


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Re: Low Stack Aero Bars/Systems [cyclenutnz] [ In reply to ]
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This should show up. The bars are tilted, that is one of the main reasons for looking at newer ones combined with the drop.


Brandon Marsh - Website | @BrandonMarshTX | Cervelo | RokaWetsuits | 1stEndurance |
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Re: Low Stack Aero Bars/Systems [-BrandonMarshTX] [ In reply to ]
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That makes quite a difference - I get the bar tilt as 13deg using the top tube as a horizontal reference (image tilted up by 2/3 of a degree)
Which drops the measured reach by 14mm and measured stack by 15 for that style bar.
Then translating that to the ways the different aerobars tilt our targets are:
Enve 456, 591
PD AU 471, 593
TR I don't know the geometry of their tilt mechanisms, Alpha X will be sim to Enve, Alpha One sim to PD AU, though probably a larger effect.


Aeria Ultimate matches very closely



Enve requires more tolerance, note that it only has two pad width options so is very limited on that front.


Both options fairly heavy.
For the PD AU I'd suggest switching to the T1 AL extensions as they have a similar angle to the 3T
And the Race armrest would suit a petite athlete well when it is available.


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