True-to-Size Millimeter Sizing Comparison
Jordan 4Rm vs Jordan Spizike Low
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 4Rm to see your calculated size in the Spizike Low.
Complete Size Conversion Matrix
Direct millimeter-calibrated mapping comparing all available sizes between both shoes.
| 4Rm (US) | Internal Cavity | Spizike Low Equivalent | Match Accuracy | Fit Difference |
|---|---|---|---|---|
| US 7 | 267 mm | US 7 | 100% | 0.0 mm |
| US 7.5 | 270 mm | US 7.5 | 100% | 0.0 mm |
| US 8 | 273 mm | US 8 | 100% | 0.0 mm |
| US 8.5 | 277 mm | US 8.5 | 100% | 0.0 mm |
| US 9 | 280 mm | US 9 | 100% | 0.0 mm |
| US 9.5 | 283 mm | US 9.5 | 100% | 0.0 mm |
| US 10 | 287 mm | US 10 | 100% | 0.0 mm |
| US 10.5 | 290 mm | US 10.5 | 100% | 0.0 mm |
| US 11 | 293 mm | US 11 | 100% | 0.0 mm |
| US 11.5 | 297 mm | US 11.5 | 100% | 0.0 mm |
| US 12 | 300 mm | US 12 | 100% | 0.0 mm |
| US 12.5 | 303 mm | US 12.5 | 100% | 0.0 mm |
| US 13 | 307 mm | US 13 | 100% | 0.0 mm |
| US 14 | 313 mm | US 14 | 100% | 0.0 mm |
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Frequently Asked Questions
How does the 4Rm size compare to the Spizike Low?
Both shoes share a very similar length profile. We recommend ordering your standard size in both. The 4Rm has an internal fit offset of 0mm compared to 0mm for the Spizike Low.
Do these shoes fit wide feet comfortably?
The 4Rm has a standard medium width profile, while the Spizike Low is standard medium.