Most AERO bottle solution.

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Alastair2308
Posts: 154
Joined: Mon Feb 24, 2020 7:16 am

by Alastair2308

I would like to know what is the most aerodynamic solution for my bottles.

It will be approx 45min Crit race. 45km/h+ average so nutrition on the bike is not critical.
The bike. Felt AR advanced Disk.
The bottles. Elite Crono CX TT bottles with carbon cages.
The diwntube of thr Felt is a VERY narrow kammtail. The bottles are SLIGHTLY wider than the down tube. And then a fair bit wider than the seat tube.

What would be best?
No bottles?
Or attempt to fill the frame up with the bottles?

Here is a pic of the bottle on the diwntube.
1000122732.jpg
1000122733.jpg
And then the seat tube bottle
1000122734.jpg

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Steve Curtis
Posts: 1435
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Location: Hampshire UK, Dublin Ireland and Geneva Switzerland.

by Steve Curtis

A backbottle in your jersey would be my suggestion.

X5SAE
Posts: 137
Joined: Sat Jan 14, 2023 7:16 pm

by X5SAE

Or some bottleholder mount attaching to your saddle.
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alanyu
Posts: 1797
Joined: Thu Jun 06, 2019 1:10 pm

by alanyu

Bottle in your pocket or after saddle.

The DT tube is old school narrow waterdrop, whatever bottle there simply destroys the aerodynamics. A bottle on ST gives less plenaty but still a plenaty.

Tifosiphil
Posts: 409
Joined: Wed Nov 14, 2018 11:09 pm

by Tifosiphil

Please do not attach any bottle under your saddle for crit racing, I have seen them to have a much higher chance of dropping a bottle than in traditional locations.

For crits (in the UK mind) I've never found a need for a bottle but I would probably go for a soft flask in a back pocket as I would imagine at most you would have 2-3 drinks and this will affect your aerodynamics less

gloscherrybomb
Posts: 275
Joined: Mon Jan 21, 2019 5:55 pm

by gloscherrybomb

alanyu wrote:
Sun Oct 06, 2024 9:56 pm
Bottle in your pocket or after saddle.

The DT tube is old school narrow waterdrop, whatever bottle there simply destroys the aerodynamics. A bottle on ST gives less plenaty but still a plenaty.
Not sure I agree with this. Of course it depends on the frame, but an aero bottle on DT fills in space and will generally be faster. I run an empty bottle on 10 mile TTs and the Cannondale aero bottle empty in crits (on a systemsix) for this reason.

The seat tube however is pretty much always a penalty - unless you've got a complete system like the new madone.

alanyu
Posts: 1797
Joined: Thu Jun 06, 2019 1:10 pm

by alanyu

gloscherrybomb wrote:
Thu Oct 10, 2024 3:42 pm
alanyu wrote:
Sun Oct 06, 2024 9:56 pm
Bottle in your pocket or after saddle.

The DT tube is old school narrow waterdrop, whatever bottle there simply destroys the aerodynamics. A bottle on ST gives less plenaty but still a plenaty.
Not sure I agree with this. Of course it depends on the frame, but an aero bottle on DT fills in space and will generally be faster. I run an empty bottle on 10 mile TTs and the Cannondale aero bottle empty in crits (on a systemsix) for this reason.

The seat tube however is pretty much always a penalty - unless you've got a complete system like the new madone.
Didn't you read the OP's description on tube shape? Aeroach has already shown data on such tube shape.

Cannondale aero bottles or the better Trek ones require a fluent transition from DT to bottles.

nigel379
Posts: 123
Joined: Sat Jun 20, 2009 3:23 am

by nigel379

alanyu wrote:
Thu Oct 10, 2024 7:32 pm
gloscherrybomb wrote:
Thu Oct 10, 2024 3:42 pm
alanyu wrote:
Sun Oct 06, 2024 9:56 pm
Bottle in your pocket or after saddle.

The DT tube is old school narrow waterdrop, whatever bottle there simply destroys the aerodynamics. A bottle on ST gives less plenaty but still a plenaty.
Not sure I agree with this. Of course it depends on the frame, but an aero bottle on DT fills in space and will generally be faster. I run an empty bottle on 10 mile TTs and the Cannondale aero bottle empty in crits (on a systemsix) for this reason.

The seat tube however is pretty much always a penalty - unless you've got a complete system like the new madone.
Didn't you read the OP's description on tube shape? Aeroach has already shown data on such tube shape.

Cannondale aero bottles or the better Trek ones require a fluent transition from DT to bottles.
That's not true: according to both Trek and Cannondale their bottles test faster on every frame they tested including round tubes. Trek even went so far as to claim they saw about the same amount of aero gains with their bottles on every frame they tested.

alanyu
Posts: 1797
Joined: Thu Jun 06, 2019 1:10 pm

by alanyu

nigel379 wrote:
Fri Oct 11, 2024 6:25 pm
alanyu wrote:
Thu Oct 10, 2024 7:32 pm
gloscherrybomb wrote:
Thu Oct 10, 2024 3:42 pm
alanyu wrote:
Sun Oct 06, 2024 9:56 pm
Bottle in your pocket or after saddle.

The DT tube is old school narrow waterdrop, whatever bottle there simply destroys the aerodynamics. A bottle on ST gives less plenaty but still a plenaty.
Not sure I agree with this. Of course it depends on the frame, but an aero bottle on DT fills in space and will generally be faster. I run an empty bottle on 10 mile TTs and the Cannondale aero bottle empty in crits (on a systemsix) for this reason.

The seat tube however is pretty much always a penalty - unless you've got a complete system like the new madone.
Didn't you read the OP's description on tube shape? Aeroach has already shown data on such tube shape.

Cannondale aero bottles or the better Trek ones require a fluent transition from DT to bottles.
That's not true: according to both Trek and Cannondale their bottles test faster on every frame they tested including round tubes. Trek even went so far as to claim they saw about the same amount of aero gains with their bottles on every frame they tested.
1. Saving compared to "round bottles" on "a range of bikes" . OP asked for fastest option
2. CFDed, not tested.

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Matt28NJ
Posts: 262
Joined: Tue Jul 14, 2009 3:16 am

by Matt28NJ

The OP asked for advice for a crit.

Please do not suggest he puts the bottle behind the saddle. If you're not sure what a crit is, I'd research that, first.

The Trek aero bottle solution is probably your best bet. For a 45 min crit, it won't matter much.

TobinHatesYou
Posts: 13439
Joined: Mon Jul 24, 2017 12:02 pm

by TobinHatesYou

I just installed the RSL cages on my 54cm Gen 6 Madone and will probably take them off. It is very difficult to remove the ST bottle and 750mL Purists do not feel very secure in their place. 650mL Purists seem okay, but the 750s get top heavy and can roll out sideways.

I may put them on for crits and run an empty ST bottle.

K4m1k4z3
Posts: 396
Joined: Sun Nov 05, 2017 1:33 pm

by K4m1k4z3

Steve Curtis wrote:
Sun Oct 06, 2024 8:14 am
A backbottle in your jersey would be my suggestion.
Maybe 1 - 3 of these package filler air pillows in the back pockets would be an even better (lighter) solution provided water is not required?
But yeah, they'd probably be better suited to like a hillclimb TT or similar.
Has anyone experimented with those?
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kiwisurf
Posts: 8
Joined: Wed Nov 23, 2016 1:43 pm

by kiwisurf

TobinHatesYou wrote:
Sat Oct 12, 2024 6:49 am
I just installed the RSL cages on my 54cm Gen 6 Madone and will probably take them off. It is very difficult to remove the ST bottle and 750mL Purists do not feel very secure in their place. 650mL Purists seem okay, but the 750s get top heavy and can roll out sideways.

I may put them on for crits and run an empty ST bottle.
I use the RSL cage with Elite Fly bottles and they fixed great. No rattle or other noices at all, also fine on pave as well.

One downside, they squizzed a bit to much when in cage, so may change for new bottles may one‘s in a saison…

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