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@hippy
http://www.sjscycles.co.uk/product-Tufo-Tufo-S22-Pro-Road-700c-x-21mm-Training-Tubular-tyre--Red-Black-10701.htm
Just remember even though it's 21mm it's not necessarily lower profile than a 23mm. Usually it will be but not all, ie. some trial and error may be needed.