Depends on how hard your going. If you at the track then heck yes its way more dangerous than if your riding an easy going trail same with snow boards if you doing the cliffs the kickers and the rails and your going out of bounds then that makes it more dangerous than the "bunny hill". So it just all depends on what your going to be doing on your board or you bike. Both are fun and i recommend both one during summer and one during winter Go out and have fun.
mountain bike riding
yes it is :) because it keeps you fit and healthy
That's a matter of opinion. You have to come up with your own ideas and try both.
If we wear not a helmet it is dangerous
There's only one way to find out... Its not that dangerous unless you are riding in the rode.
On a dual sport bike, one is supposed to wear; a riding jacket, pants with pads, full face street helmet, MX boot and leather gloves.
although you've probably got the answer... Trial Bike riding?
more for drag racing, not trail riding
Yes it is. I do like riding my bike. I did like riding my bike
If you're riding a cruiser about $900 a year, if you're riding a sport bike about $5,000 per year.
Bicycles don't pollute, take less space to park and are less dangerous for pedestrians.
is a bike mechanical