What size is Adidas US 11 in Reebok?

About Reebok US 11 (EU 45), matched by ~27.9 cm. Then adjust for the specific model.

Is a Adidas 11 the same as a Reebok 11?

Not always. Labels can map to different foot lengths — use cm, then model fit.

Brand-to-brand size at a fixed US label — matched by foot length (cm), not guesswork.

Adidas US 11 maps to about 27.9 cm on that brand’s chart. The nearest Reebok row at that length is US 11 / EU 45.

Same chart cm can still feel different on foot. Read the guides:

Adidas: Samba OG (runs narrow) · Gazelle (runs big) · Ultraboost 1.0 (true to size) · Campus 00s (true to size) · Handball Spezial (true to size)

Reebok: Club C 85 (true to size)

What size is Adidas US 11 in Reebok?: About Reebok US 11 (EU 45), via ~27.9 cm.
Where is the full size table?: Adidas to Reebok compare.