I like to keep at least one set of replacement bearings on hand for every hub that I have. For this purpose, I've prepared the table below which lists the bearing sizes for all of the hubs that I currently have.
| Hub | Bearing Dimensions | Designation | Quantity | ||
|---|---|---|---|---|---|
| Inner Dia | Outer Dia | Width | |||
| A2Z New | 15mm | 28mm | 7mm | 6902 | 2 |
| A2Z Old | 15mm | 26mm | 7mm | 15267 | 2 |
| DT Swiss 240s | 15mm | 28mm | 7mm | 6902 | 2 |
| DT Swiss 240s converted to 15mm thru | 17mm | 28mm | 7mm | 17287 | 2 |
| Hope Pro 2 | 20mm | 32mm | 7mm | 6804 | 2 |
| Novatec 711 | 15mm | 28mm | 7mm | 6902 | 2 |
| Novatec 881 | 20mm | 32mm | 7mm | 6804 | 2 |
| Tune King | 17mm | 26mm | 5mm | 6803 | 2 |
| WTB Laserdisc Super Duty | 30mm | 30mm | 9mm | 6904 | 2 |
, but there is surprisingly little information ...