Draft data: Fit verdict is not fully verified yet. Do not treat as final advice.

Does the Brooks Glycerin 21 Run Big or Small?

True to Size True to size
Stick with your usual size. · confidence: low

Interactive suggestion based on this model’s fit offset (+0 US). Always confirm with a retailer return policy.

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Width
Plush midsole — length TTS
Break-in
None

Summary

VERIFY BEFORE PUBLISH: Glycerin usually TTS; prioritize width choice over length tricks.

US / UK / EU / cm chart

General reference chart (not brand-official). US_M is this model’s primary system.

USUKEUcm
65.53924.0
6.5639.524.5
76.54025.0
7.5740.525.5
87.54126.0
8.584226.5
98.542.527.0
9.594327.5
109.54428.0
10.51044.528.5
1110.54529.0
11.51145.529.5
1211.54630.0
1312.547.531.0

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