*Product logistics is currently handled via printing serivce, delivery times are roughly a week.  Finish product photos will be uploaded as they're available.
The first drop in the Bad Investment Builds Cheat Sheet Series — where suspension math meets streetwear.
The front lays out the core equations for evaluating and optimizing suspension ride stiffness: motion ratios, spring forces, tire and bushing stiffness — the stuff that actually explains why your car feels the way it does. The back expands into a full infographic covering nominal ride frequency ratio, axle heave and pitch behavior over a bump, and the equations that tie sprung mass, corner stiffness, and wheel hop frequency together. Neon on black, sketchbook-meets-chalkboard energy — it looks like something pulled off a race engineer's wall.
This is real vehicle dynamics knowledge you can wear. Too soft in the rear and it feels unsupported, lazy to respond — great for offroad stability over reapeated bumps, not so great for the chicanes. Too stiff and it bucks and pitches like it can't settle, chasing its own tail down the road. This T-shirt explains the difference, and the math behind fixing it.
Soft, heavyweight feel with a relaxed drape — built for the cool garage, the paddock, or chilly meets. Tear-away label and printed inner neck so nothing scratches when you're leaned over an engine bay for three hours.
Wear it to start the conversation. Learning the how gives you more time to think about the why — and that's the whole point of Bad Investment Builds.
Follow @badinvestmentbuilds on Instagram and YouTube. Use the Ride Frequency Calculator at badinvestmentbuilds.com to dial in your own setup
This is for the highly engineered DIYer. Not the one with the most money — the one who did the math.
Product features
- Soft 3-end fleece with a luxurious hand-feel
- Adjustable hood with self-colored drawcords and metal grommets
- Spacious kangaroo pouch pocket to warm hands
- Durable details: double-needle topstitching, twill necktape, under 5% shrinkage
- Stable fabric blend (80% combed ring-spun cotton / 20% recycled polyester; heathers vary)

Care instructions
- Machine wash: cold (max 30C or 90F)
- Do not bleach
- Tumble dry: low heat
- Iron, steam or dry: low heat
- Do not dryclean