Carrier iruCart

A compact cycle trailer that doubles as a cart.
Carry a lot in style.

iruCart is a compact size trailer designed to connect to the saddle and be towed. Or it can be used as a carry cart. It can even carry iruka in Sleep mode.

Attach and detach with a touch.

Just snap on the coupler underneath the saddle. It takes only a second to attach or detach.

Amazingly large capacity.

The large capacity platform is 80cm in length, and will carry even large luggage with no problem. It carries up to 15 kg.

Carry on wheels

Detach from the coupler and it becomes a carry cart. You can easily roll your luggage.

Optimized for iruka

By fitting the wheels into the slot, you can carry iruka in Sleep mode.

Some places such as JR stations may require you to store iruka in a bicycle bag then place it in iruCart.

For bikes other than iruka

With the optional coupler (included with iruka purchase), you can use iruCart on small-wheeled bicycles other than iruka.

It utilizes the same coupler as iruCarry. The coupler is compatible with saddles with a rail width of 44mm(center distance, allowance ±1mm). M5 hex wrench is required to mount the coupler.


Size W350mm x L1180mm x H300mm
Adaptive wheel size Within 600mm
Maximum loading capacity 15kg

The weight and shape of your luggage may affect your bike’s ability to brake and maneuver on curves and downhill slopes. Please use caution when riding. Bikes that tow trailers, and rear-cars, etc, do not fall under the definition of “Ordinary Bicycle” stated in Japan’s Road Traffic Law Article 63, Item 3. When you ride a bike with a tow, you may face certain regulations, and pedestrian lanes where ordinary bikes are allowed may be restricted.


When I was traveling in Norway, I saw a bike trailer for the first time in my life. At the point, I was starting to feel I needed something bigger than the saddlebag I’d been using for my overnight road trips. If I had a trailer, I could attach it to my bike and carry more. That would be nice.


After I came home from the trip, I purchased a German bike trailer. It carried a lot as I expected, but I wasn’t satisfied with its maneuverability. Because it attached to the rear wheel axle, the entire length of the bike was doubled. It was more difficult to park and created a larger inner wheel difference on curves. The problems were less noticeable on country roads, but I was hesitant to use it on urban streets. As a result, the trailer ended up in the corner of my garage, collecting dust.


Soon after I began designing iruka, I decided I should make a compact trailer that would be easy to use on urban streets. The first prototype would attach to the seat post, but after testing several versions, I finally settled on the type that utilized a coupler on the saddle rail. The coupler can be shared with iruCarry.


I tried loading various things on the iruCart prototype – tennis racket bag, guitar, a box full of books – and rode around Tokyo. I felt a subtle vibration on the saddle every now and then, as if iruCart was assuring me “your luggage is safe, here.” It was a pleasant feeling.

Just before finishing the final design drawing, I came up with this idea – iruCart could carry iruka if I included a slot for a wheel. So I made the last minute change on the design.



Masaki Mark Kobayashi
Founder and President, iruka Inc.