Since I'm a size M, I think it's around 23-24cm. I bought it without trying it on, hoping it would fit, but it didn't fit me, as I usually wear 24.5cm. It's difficult to know if something fits without trying it on, isn't it? (^_^;) Perfect for the coming season. Retail price is 3080 yen. I've lowered the price, so please feel free to purchase. I'm not negotiating on the price, sorry m(_ _)m