True-to-Size Millimeter Sizing Comparison
Brooks Addiction Walker 2 vs Brooks Adrenaline GTS 25
Detailed size conversion chart, cavity measurements in millimeters, and crowd-sourced fit advice for choosing your perfect size.
Interactive Size Converter
Select what size you wear in the Addiction Walker 2 to see your calculated size in the Adrenaline GTS 25.
Complete Size Conversion Matrix
Direct millimeter-calibrated mapping comparing all available sizes between both shoes.
| Addiction Walker 2 (US) | Internal Cavity | Adrenaline GTS 25 Equivalent | Match Accuracy | Fit Difference |
|---|---|---|---|---|
| US 4.5 | 229 mm | US 4.5 | 53% | +4.0 mm |
| US 5 | 233 mm | US 4.5 | 100% | 0.0 mm |
| US 5.5 | 236 mm | US 5 | 88% | +1.0 mm |
| US 6 | 239 mm | US 5.5 | 88% | +1.0 mm |
| US 6.5 | 243 mm | US 6 | 100% | 0.0 mm |
| US 7 | 246 mm | US 6.5 | 88% | +1.0 mm |
| US 7.5 | 249 mm | US 7 | 88% | +1.0 mm |
| US 8 | 253 mm | US 7.5 | 100% | 0.0 mm |
| US 8.5 | 256 mm | US 8 | 88% | +1.0 mm |
| US 9 | 263 mm | US 8.5 | 65% | -3.0 mm |
| US 9.5 | 266 mm | US 9 | 88% | +1.0 mm |
| US 10 | 269 mm | US 9.5 | 88% | +1.0 mm |
| US 10.5 | 273 mm | US 10 | 100% | 0.0 mm |
| US 11 | 276 mm | US 10.5 | 88% | +1.0 mm |
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Frequently Asked Questions
How does the Addiction Walker 2 size compare to the Adrenaline GTS 25?
The Adrenaline GTS 25 provides about 4mm more internal length than the Addiction Walker 2. We suggest ordering 1/2 size down in Adrenaline GTS 25. The Addiction Walker 2 has an internal fit offset of -4mm compared to 0mm for the Adrenaline GTS 25.
Do these shoes fit wide feet comfortably?
The Addiction Walker 2 has a standard medium width profile, while the Adrenaline GTS 25 is standard medium.