What size is Adidas US 8 in Reebok?

About Reebok US 8 (EU 41), matched by ~25.4 cm. Then adjust for the specific model.

Is a Adidas 8 the same as a Reebok 8?

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 8 maps to about 25.4 cm on that brand’s chart. The nearest Reebok row at that length is US 8 / EU 41.

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 8 in Reebok?: About Reebok US 8 (EU 41), via ~25.4 cm.
Where is the full size table?: Adidas to Reebok compare.