I have been wearing Reebok's running shoes for about 8 years. Although I like Reebok, they have sizing issues and the sizes are not consistent across their shoe lines. My size is US 7 or 23.5-24cm. When I buy other brands' shoes and boots, I always buy US 7 and never had problems. Reebok is the only one I have to actually try on before purchase or needed some exchanges because of their Women's US 7 isn't accurate or consistent. I have had to buy US 7.5 for Reebok Easy Tone and Run Tone, and another pair of Reebok's walking shoes were 7.
For these particular running shoes, I got 7, and they were way too big. I could fit in 2 fingers behind my heel. I returned them and got 6.5. They were then way too small - they damaged my toenails during my first run in them and my toenail has turned black. I could not return the shoes anymore because I wore them. So I donated the shoes. I was so disappointed.