True-to-Size Millimeter Sizing Comparison
Teva Original Universal vs Teva Tirra
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 Original Universal to see your calculated size in the Tirra.
Complete Size Conversion Matrix
Direct millimeter-calibrated mapping comparing all available sizes between both shoes.
| Original Universal (US) | Internal Cavity | Tirra Equivalent | Match Accuracy | Fit Difference |
|---|---|---|---|---|
| US 4.5 | 233 mm | US 3.5 | 20% | +6.8 mm |
| US 5 | 237 mm | US 3.5 | 67% | +2.8 mm |
| US 5.5 | 240 mm | US 3.5 | 98% | -0.2 mm |
| US 6 | 243 mm | US 4 | 98% | -0.2 mm |
| US 6.5 | 247 mm | US 4.5 | 98% | -0.2 mm |
| US 7 | 250 mm | US 5 | 98% | -0.2 mm |
| US 7.5 | 253 mm | US 5.5 | 98% | -0.2 mm |
| US 8 | 257 mm | US 6 | 98% | -0.2 mm |
| US 8.5 | 260 mm | US 6.5 | 98% | -0.2 mm |
| US 9 | 267 mm | US 7 | 98% | -0.2 mm |
| US 9.5 | 270 mm | US 7.5 | 98% | -0.2 mm |
| US 10 | 273 mm | US 8 | 98% | -0.2 mm |
| US 10.5 | 277 mm | US 8.5 | 98% | -0.2 mm |
| US 11 | 280 mm | US 9 | 98% | -0.2 mm |
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Frequently Asked Questions
How does the Original Universal size compare to the Tirra?
Both shoes share a very similar length profile. We recommend ordering your standard size in both. The Original Universal has an internal fit offset of 0.2mm compared to 0mm for the Tirra.
Do these shoes fit wide feet comfortably?
The Original Universal has a standard medium width profile, while the Tirra is roomy/wide.