Hi Gary, Not too sure about sizing the machine I have just bought, but it does appear to be Colnago MTB - Model= 'Maxim'. If you are still interested, please come back to me and tell me how to measure the frame as needed? No idea how far away from me you are - I am in West Norfolk - but to discuss it I am on Methwold 01366728030. The bike is a 26" wheeled one, with 21 gears and at the moment pretty scruffy as found neglected in a garage! Cheers, Richard