If you are buying a BMX for doing tricks, you would want to buy one with lesser number of teeth on it. This is so that you can start to ride off faster after doing your twists and turns. However, if you like to go a longer distance, if that is what you mean by long rides, choose one installed with larger number of teeth on chainrings, eg one with 48 teeth.
This is a GT BMX 43T (teeth) chainring. You should be able to find BMX with 28T (teeth) right up to 48T (teeth) chainring.
A BMX with larger wheel size instead of the common 20” will also help you cover more distance. You can calculate your gear ratio and how far you can go each revolution by knowing your wheel size, the number of teeth on your chainring and on your rear sprocket.
There is a table posted at link to article BMX Madness Gear Ratio and Sizing Charts which shows the distance you can cover based on the above information. I have also extracted from the site to show you how that is calculated:
“For example, if your front sprocket is a 45 tooth, and your rear sprocket is a 16 tooth, then your gear ratio would be 2.8125 (45 divided by 16 = 2.8125). You then take that number (in this case 2.8125) and multiply it by 20 (the diameter of a BMX wheel). 2.8125 x 20 = 56.25 (the gear size). You can apply this simple formula to cruisers (BMX bikes with 24" wheels) by multiplying the gear ratio by 24 instead of 20.”
If "long rides" means ride for a longer period, you have to note that most BMX are made of steel to handle the stress of load during jumps from a height so it is a heavier bike to ride. Make sure that you choose a frame size that is suitable for your height. If the bike is too small, you are more likely to stand up to pedal, each time you want to relieve the fatigue on your legs. That will damage your pedals more quickly than they should.
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