A client approached PrototyperLab with the goal of creating a set of Halloween-themed bicycle costumes that were fun, visually recognizable, low-cost, and easy for end users to install. The challenge was designing costumes that mounted securely to an adult bicycle without interfering with wheels, pedals, chain, or rider movement.

PrototyperLab developed four designs—T-Rex, Unicorn, Rocket, and Eggplant—and produced a 50-unit small batch for retail testing.

The Problem

The client needed a seasonal novelty product that met four strict requirements:

• Safe during riding — no contact with moving bike components
• Low manufacturing cost — suitable for one-time Halloween use
• Simple assembly — tool-free, 5–10 minute setup for customers
• Small batch production — only 50 units required for market testing

Traditional factories would reject the project due to low MOQ, and most costume concepts conflicted with bicycle geometry and rider motion.

The Solution

PrototyperLab designed a lightweight foam-based costume system using:

• EVA foam sheets for structure and shape
• Laminated printed graphics for artwork
• Universal Velcro strap mounting for any adult bicycle
• Internal foam ribs in select areas to maintain shape

Each costume was engineered with clearance zones mapped around wheels, pedals, knees, and cables.

Final designs included:

• T-Rex — head and tail panels with reinforced edges
• Unicorn — horn stiffener, mane panels, fold-flat graphics
• Rocket — reduced-size fins for knee clearance
• Eggplant — dual-layer curved body and stable stem piece

Our Process

1. Engineering & Geometry Mapping

The team identified all mechanical and rider movement zones:

• Wheel rotation paths
• Pedal arc and crank clearance
• Knee sweep radius
• Brake and shifter cable lines

Costume boundaries were defined around these paths to guarantee no interference.

2. Prototyping & Fit Testing

Rapid prototypes were fabricated and tested for:

• Riding stability
• Wind deformation
• Strap slippage
• Frame fits across multiple bicycle types
• Shape retention during motion

Adjustments were made until all four designs passed clearance and stability requirements.

3. Attachment System

A universal mounting system was created:

• EVA foam fold lines pre-scored for shape formation
• Color-coded or indexed strap points to prevent misassembly
• All components attach using Velcro—no tools required
• Installation time: 5–10 minutes

4. Small Batch Production (50 Units)

Once prototypes were approved, PrototyperLab produced:

• Precision-cut foam panels
• Laminated graphics
• Pre-folded structural pieces
• Mounted Velcro straps
• Individual QC and flat-pack packaging

Total run: 50 units across all four designs

All units shipped on time and within budget.

The Outcome

The client received four market-ready bicycle costume SKUs:

• T-Rex
• Unicorn
• Rocket
• Eggplant

All designs met the project requirements:

• Safe for riding
• Lightweight and stable
• Fast, tool-free installation
• Low cost for seasonal use
• Compatible across adult bicycles
• Successfully produced in a small batch of 50 units

The product line is now suitable for Halloween events, parades, social rides, and e-commerce launch testing.