• You can use a QR but yours is either not up to the task or you're not doing it up tight enough. Personally I wouldn't use one but Sheldon would (he suggested the steel Shimano ones not the lighter versions).

    You also need to sort the chainline out. A crooked chain will wear out very quickly or, as you've found out, slip. Usually when you need to take off quickly which will result in balls meets top tube = no fun.

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