Older 10 speed style road bikes are 100mm in the front and 130mm in the rear. 90s style mountain bikes are 100mm in the front and 135mm in the rear.
Now there is Boost and Boost+ standards, and quick release skewers and through axles. You can convert a through axle wheel to use quick release skewers, but not the other way around.
Over Lock-nut Diameter (OLD) is the distance between the outside of the lock-nuts on a hub. This matches the width on the frame's fork and rear dropouts.
| Front | F axle | Rear | R axle | Bike type |
|---|---|---|---|---|
| 96mm | 120mm | Vintage road | ||
| 100mm | 8mm BO | 110mm | 8mm BO | Vintage track |
| 100mm | 9mm BO | 120mm | 10mm BO | Modern track |
| 100mm | 9mm QR | 130mm | 10mm QR | 5-10sp Road bike |
| 100mm | 9mm QR | 135mm | 10mm QR | Disc brake road bikes w/ QR |
| 100mm | 9mm QR | 135mm | 10mm QR | 8-10sp Mountain bike |
| 100mm | 12mm TA | 142mm | 12mm TA | Modern road bike |
| 110mm | 12mm TA | 148mm | 12mm TA | Boost road bike, ebikes |
| 100/110mm | 12mm TA 15mm TA |
142/148/ 150/157mm |
12mm TA 15mm TA 20mm TA |
Modern mountain bike |
*BO = Bolt on
*QR = Quick release
*TA = Thru axle