This neat little guy attaches to your existing cafe/wheel lock, so you only need the one key!
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What a good little solution, it's the sort of thing that you look at and go "gee, they really thought about that"

Abus has made the wheel locks that you find on many e-bikes and town bikes, compatible with this chain. Simply plug it into the hole on the other side of the key barrel and Bobs your Uncle, you have a new lock with the same chain. 

The adapter chain can be inserted into all ABUS frame locks whose product names contain a combination of four numbers.