Reebok vs Brooks Shoe Size - Which Runs Smaller?

Reebok and Brooks run true to each other. Keep your usual size when switching. If you wear Reebok in US 9, start by checking Brooks in US 8.5. Both brands use the same foot-length measurement; the small differences are in last shape, not the conversion formula.

Reebok to Brooks size chart

Starting Brooks size to check when you wear Reebok in each US men size.
US Men (Reebok) Reebok -> Brooks Foot length
7 6.5 246mm
8 7.5 254mm
9 8.5 262mm
10 9.5 271mm
11 10.5 279mm

Fit verdict

  • Reebok: True to size (60% of buyers)
  • Brooks: True to size (65% of buyers)

Why the sizes differ

Reebok and Brooks are close enough to treat as the same size at the brand level. The measured gap is about 2mm.

Reebok foot length is measured in millimetres, then mapped to US size. The Brooks starting size stays the same because of each brand fit bias, not a different conversion formula.