• It's a European frame so it is more than likely that it is a 700C - but to be 100% sure, put in a wheel of that size and see how much clearance there is.
    Compare these two photos:

    The one on the left is a Raleigh that was designed for 27", the one on the right is for 700C (they are the same set of wheels).

    I'm running a wheel building class in mid-June if you want to learn mechanics and save some £££ on new wheels.

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