Rear dropounts-How to DIY your bike with good carbon frame

Rear dropouts 

This is where your rear wheel’s hub fits into the frame. This determines what rear wheel and hub is compatible with your frame. 

Most older frames: Quick-release dropouts; 130mm wide on road bikes and 135mm wide on mountain bikes. Vintage bikes are often 126mm and fixed-gear track frames are 120mm. 

Newer mountain bike frames: 12x148mm Boost spacing is the current standard — older models may use the 12x142mm thru-axle standard.

Super-Boost spacing: 157x12mm. This is seen on some new mountain bike models. 
New road and gravel bikes: 12x142mm thru-axles (some odd models use the less common 135mm width).