Question: are 700c tires the same as 27?
Answer: These are NOT the same as the 700C tires found on modern road bikes. ... 27-inch and 700C tires are close enough in size that the inner tubes are compatible; i.e. you can use a 27-inch inner tube in a 700C tire, and vice-versa. However, you can NOT use a 27-inch tire on a 700C wheel, and vice-versa.