There is no single answer, and anyone giving you one without asking two questions is guessing. The two questions are: what wheel size, and how much disassembly are you prepared to ask of whoever packs the bike. Those two answers together define the box.
Match the box to the disassembly level
| How far the bike is stripped | What the box has to clear | Consequence |
|---|---|---|
| Both wheels on, bars turned | Full wheelbase and the full wheel diameter | The largest box, close to carrier oversize limits, most expensive to ship |
| Front wheel off, laid beside the frame | Frame length plus the wheel lying alongside | The common shop pack. Big saving in length, modest gain in width |
| Both wheels off, bars and pedals removed | Frame triangle plus two wheels flat | Smallest practical box. Needs clear packing instructions |
| Frame only, wheels shipped separately | Frame triangle only | Smallest box, two consignments, higher total freight |
Pick the row your instructions will actually describe, not the one you hope for. Customers pack to the instructions in the box, and a carton sized for a fully stripped bike with instructions that say nothing about pedals will come back damaged.
The wheel sets a floor
Whatever you strip, a wheel has to fit, and wheel diameters are one of the genuinely standardised dimensions on a bike. Under ETRTO, bead seat diameter is 559 mm for a 26 in wheel, 584 mm for 27.5 in or 650b, and 622 mm for 29 in and 700c. Add the tyre, which is where a wide mountain tyre and a narrow road tyre part company significantly. That figure is the smallest the box face can ever be.
Frame size matters less than you would expect
Frame sizes are quoted in centimetres of seat tube or in S, M and L, and those numbers do not translate directly to a box dimension. What actually changes with frame size is the wheelbase and the standover, and those change less between a medium and a large than most people assume. Size the box to the largest frame you ship and the smaller ones will pack fine with a little extra padding. Running two box sizes across a frame range rarely pays for the second die and the extra stock line, although with the die included on iBox orders the calculation is different from a supplier who charges for tooling.
Check the external dimension against the carrier
Bike boxes live near carrier oversize thresholds by nature. Once you have an external dimension, run the length plus girth sum, where girth is twice the width plus twice the height, and compare it with your own rate card. Surcharge steps are cliff edges. An inch over a threshold costs the same as a foot over it, and sometimes a slightly deeper strip-down moves the whole programme under a step.
Ordering
Minimum order is 100 boxes. Pricing starts from about $0.48 per unit at bulk volumes and is confirmed on your written quote, with the die, the plates, design support, US shipping and a digital proof included. Lanes are rush (expedited production with air freight), standard (air) and cost saver (sea), from about 7 business days, plus 2 to 5 for delivery. Boxes are made at West Chicago and at Guangzhou.
If you want the measuring method rather than the decision, how to size a bike box covers it in order. Otherwise send the wheel size, the largest frame you ship and your disassembly instructions through the quote form.
