Do you want a bike trailer or a bike seat? Can you mountain bike with a kid this age? What about my mountain bike – can I use it or do I need to buy a new one? There is tons of gear out there designed to help you comfortably tow a kid around, but before you put a credit card down, you need to bone up by asking the right questions. Lucky for you, we already asked the internet’s foremost expert on biking with kids.