There are several sizes available. Most are 622 mm bead seat diameter.
depends the age and size
Any tire really.
yes, the dirt bike doesnt have to do with it. It depends on the tire size, and yes they both have the same size tires in frount and rear.
Becuse that's what it says on the sidewall of the tire... "inflate to...". Bike tires have a higher number there than car tires do. ;-). OK - actually it is a factor of the ratio of the tire's footprint size to the weight supported. Bike tires have a very small area that contacts the surface and therefore require a higher pressure to support the weight.
There shouldn't be, as long as the tires are the proper size for the bike
If you bought a new complete bike (not just the frame) you can look at the sidewall of the tires to find out what size you'll need. Many bike manufacturers also list tire requirements online.
The safety bicycle was safer because both of its tires were the same size.
the speed depends on how well tuned the bike is and also the size of the engine.
Well, inflating them a bit harder will make them a bit rounder. But if you overdo it the tubes/tires might burst. Most bike tires have their size written on the sidewall somewhere, if yours is a narrower kind you can have wider ones fitted.
MAYBE - , frame size has nothing to do with tire size. Style does, and if its a mountain bike, it will not work with a 27 (road racing) wheel and tire. Brakes will not fit.
Talk with a salesman, let them help determine what size dirt bike is appropriate for your. Be sure to tell them what you will be doing, play riding, racing, dual sport rides, etc. Select a model that is suitable for your skill level taking into account the bike's handling, power and size. Sit on the bike to make sure it is the right size and test ride each bike. Also, consider buying a used dirt bike.
It's more like a kid's street bike. It's not a freestyle bike because it doesn't have any platforms and no front brake. It's not really a racing bike because it has a Gyro rotor, although there's nothing really stopping you from using it in a race. Another thing about the bike is the wheel size is an odd ball 18" (as opposed to 20").