Brooks vs Reebok Shoe Size - Which Runs Smaller?

Brooks runs about half a US size large compared to Reebok. If you wear Brooks in US 9, start by checking Reebok in US 9.5. Both brands use the same foot-length measurement; the difference is in the last shape, not the conversion formula.

Brooks to Reebok size chart

Starting Reebok size to check when you wear Brooks in each US men size.
US Men (Brooks) Brooks -> Reebok Foot length
7 7.5 246mm
8 8.5 254mm
9 9.5 262mm
10 10.5 271mm
11 11.5 279mm

Fit verdict

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

Why the sizes differ

Brooks runs about half a US size large compared to Reebok, with roughly 2mm between the matched fit records.

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