Granny Wheels

Transporting groceries, bottles, or bulky items on a bicycle or e-bike can be challenging—especially when dealing with shifting loads, odd shapes, or heavy items like glass bottles. One of the oldest DIY cargo solutions is the classic milk crate, but many riders struggle with the same questions:

• How do I mount a crate securely on a rear bike rack?
• Will it wobble or slide around?
• Is it safe on bumpy roads or steep hills?

To answer these questions, we shot a new test video demonstrating how a fully loaded milk crate performs when strapped to the Granny Wheels Rack Expander. Below is the complete walkthrough, plus our findings from real-world testing.

Why Use a Milk Crate for Bike Cargo?

Milk crates are practically made for bikes:

• They’re tough and rigid
• They hold bottles and tall items upright
• They have built-in handholds and tie-down points
• They’re cheap or free
• They fit on almost any bike rack with the right accessories

But their square shape and tendency to shift make secure mounting essential.

This is where the rack expander + flat bungee system becomes a game-changer.

The Setup: Fully Loaded Crate + Rack Expander

For the test, we filled the crate with:

• Bottles of milk (the primary weight)
• Tall jars and other bottles to fill the sides

The crate was packed tight and heavy—the kind of load that normally causes wobbling or squeaking on a standard rack.

Step-by-Step: How We Secured the Crate

1. Place the crate on the rack expander

The wide surface of the expander prevents “teetering,” giving the crate a flat, stable footprint.

2. Use two adjustable flat bungees in a cross pattern

Cross-strapping stops both side-to-side and front-to-back movement.
This is much more stable than simply strapping over the top.

This setup takes less than 30 seconds and works on any rear rack.

Does It Actually Work? Our Test Ride Results

We took the loaded bike out for:

• bumps
• corners
• sudden stops
• uphill and downhill riding
• slow-speed maneuvering
• rough patches of pavement

The result?

✔️ No wobble
✔️ No rattling
✔️ No shifting inside the crate
✔️ Bungees stayed fully tensioned
✔️ Crate remained rock-solid, even when shaken by hand before the ride

The wide rack expander combined with flat adjustable bungees with tri-glide webbing slide buckles creates a secure, predictable cargo setup that feels stable even with a tall, heavy load.

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Who Is This Setup Perfect For?

• Grocery shoppers
• Commuters
• Students
• E-bike delivery riders
• Anyone carrying bottles, jars, or bulky everyday cargo

If you’ve ever tried to carry a fully loaded crate on a narrow rack and felt it sway, this system eliminates that problem entirely.

A milk crate is one of the most useful everyday cargo solutions for bikes, but only when secured correctly. With the right anchors and a stabilized platform, even a heavy crate full of bottles becomes easy and safe to transport.

If you’re looking to upgrade your cargo capacity without switching to a front basket or a full cargo bike, the Granny Wheels Rack Expander is one of the simplest ways to instantly carry more, safely.