TT Aero Extension Bar

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Bounding box: 44 × 318.3 × 50.0 mm
Engine: 3D Printing B-rep
Parameters: 17
Published: November 4, 2026

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The prompt

I want to draw a time trial bicycle extension bar, such as the Speeco TTX reference images, with a parametric model that allows to modify the design's dimensions and were all of the body's surfaces are generated through truncated NACA profiles parallel to the ground so as to minimize air resistance

Parameters

Name	Value	Range
Extension length	280 mm	120 – 400
Rear airfoil chord	44 mm	25 – 80
Mid airfoil chord	38 mm	20 – 80
Tip airfoil chord	28 mm	15 – 70
NACA thickness ratio	0.18 mm	0.08 – 0.3
Truncated trailing-edge thickness	2 mm	0.5 – 6
Chord taper transition	0.55 mm	0.1 – 0.9
Tip vertical rise	28 mm	0 – 80
Upsweep start position	0.55 mm	0 – 0.85
NACA points per side	24 mm	8 – 60
Loft sections	20 mm	5 – 40
Base bar diameter	31.8 mm	22 – 40
Clamp wall thickness	4 mm	2 – 10
Clamp width along base bar	20 mm	8 – 40
Radial clearance	0.3 mm	0.1 – 1
Overlap with airfoil body	1.5 mm	0.5 – 4
Clamp bolt hole diameter	5.5 mm	3 – 10

Every value above is a live dimension. Open a model like this in the editor and each one becomes a slider you can drag before exporting.

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