Frankfurt Airport has high quality strong cardboard bike boxes. They sell them for 25 EUR and you get a roll of packing tape. You can buy the boxes in Terminal 1 in front of ticket counter 460. The guys who wrap the luggage in plastic are the ones who sell you the ticket to pick up the boxes. You then walk over to the "Service Point - Luggage Storage" about 50m away and that guy gives you the boxes. Good idea to give them a call to make sure they have boxes in stock. Phone number is buried down in their website. Frankfurt has no problem whatsoever with you assembling/disassembling your bike anywhere. Frankfurt is a great airport!!
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