True-to-Size Millimeter Sizing Comparison

Allbirds Tree Runner vs Nike Vomero 18

Detailed size conversion chart, cavity measurements in millimeters, and crowd-sourced fit advice for choosing your perfect size.

Shoe Aunisex
Allbirds Tree Runner
4.7(6,450 reviews)
Fit TendencyTrue to Size
Width ProfileStandard (Medium)
View Full Tree Runner Breakdown
Shoe Bmen
Nike Vomero 18
4.8(213 reviews)
Fit TendencyRuns Large (+4mm)
Width ProfileStandard (Medium)
View Full Vomero 18 Breakdown
Fit Verdict

Vomero 18 Runs Slightly Larger

The Vomero 18 provides about 4mm more internal length than the Tree Runner. We suggest ordering 1/2 size down in Vomero 18.

Length Delta+4 mm
Width DeltaIdentical

Interactive Size Converter

Select what size you wear in the Tree Runner to see your calculated size in the Vomero 18.

Recommended Size in Nike Vomero 18
US 8100% Match

Internal shoe cavity difference: 0.0 mm (snugger)

Complete Size Conversion Matrix

Direct millimeter-calibrated mapping comparing all available sizes between both shoes.

Tree Runner (US)Internal CavityVomero 18 EquivalentMatch AccuracyFit Difference
US 3.5240 mmUS 70%+31.0 mm
US 4243 mmUS 70%+28.0 mm
US 4.5247 mmUS 70%+24.0 mm
US 5250 mmUS 70%+21.0 mm
US 5.5253 mmUS 70%+18.0 mm
US 6257 mmUS 70%+14.0 mm
US 6.5260 mmUS 70%+11.0 mm
US 7267 mmUS 753%+4.0 mm
US 7.5270 mmUS 788%+1.0 mm
US 8273 mmUS 7.588%+1.0 mm
US 8.5277 mmUS 8100%0.0 mm
US 9280 mmUS 8.588%+1.0 mm
US 9.5283 mmUS 988%+1.0 mm
US 10287 mmUS 9.5100%0.0 mm
US 10.5290 mmUS 1088%+1.0 mm
US 11293 mmUS 10.588%+1.0 mm
US 11.5297 mmUS 11100%0.0 mm
US 12300 mmUS 11.588%+1.0 mm
US 12.5303 mmUS 1288%+1.0 mm
US 13307 mmUS 12.5100%0.0 mm
US 14313 mmUS 1376%-2.0 mm

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Frequently Asked Questions

How does the Tree Runner size compare to the Vomero 18?

The Vomero 18 provides about 4mm more internal length than the Tree Runner. We suggest ordering 1/2 size down in Vomero 18. The Tree Runner has an internal fit offset of 0mm compared to 4mm for the Vomero 18.

Do these shoes fit wide feet comfortably?

The Tree Runner has a standard medium width profile, while the Vomero 18 is standard medium.