Most AERO bottle solution.

[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.

And then the seat tube bottle

[Steve Curtis]

A backbottle in your jersey would be my suggestion.

[X5SAE]

Or some bottleholder mount attaching to your saddle.

[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]

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]

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]

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]

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]

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.

[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]

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]

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?

[kiwisurf]

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…