Steerer Length & Fork Offset
The length of your steerer tube and fork offset can make a difference to how your bike is set up and ultimately feels. The shorter the steerer the lower your stem and bars will sit. The shorter your offset the more twitchy and responsive your front end will feel. Short offset forks are more popular for street/park setups, whereas a longer offset would be used for a more traditional/trail setup.
For riders that want brakes on the front, some companies offer modern made forks with 990 brake mounts. Modern geometry and manufacturing methods ensure strong, lightweight 990 brake mount forks. If you are after front brakes for your next BMX build this is something to consider.
Materials, Manufacturing and Warranty
Most BMX forks are made from 4130 Chromoly, however, the thicknesses, lengths and the machining process are always vastly different. Invest casted dropouts and heat-treating increase the strength and durability of the fork with some companies offering a lifetime warranty.
Finally, like most things in life, all forks come at a price. Prices for forks can start as low as $100 (AUD) to as much as $350. Prices can vary depending on brand, and strength. More expensive forks offer lifetime warranties, thicker tubing and investment cast dropouts.