Bolt-On Hubs, Heavy Duty/Double Throw

this is a to Axl this is not a to Axl it's not even an Axl it's a skewer also known as a QR or quick release it relies on an axle built into the hub it used to be how we held our wheels in our bikes but they could come loose and they weren't very stiff so now we use these these are thresholds and there are a lot of things you have roads like two axles which are the same as gravel bike racks or which mostly started out as cyclocross bikes through accidents and those started out as mountain life through axles to understand why they're all different you need to understand the hubs this is a hub the hub which measures the space between the dropouts but all through axles are actually longer than the hub way the few axle is longer because it has to go through the hubs and each dropout all frames and forks have different thickness dropouts and use different thread pitches so there have to be a