Strange question. MTB tires are usually 2-and something inch wide, a handle bar will be around 20 inches wide, the rear hub about 6 inches and the saddle is thereabouts too.
Use the size that fits your cycle
the overall frame size. not specific to wheel size, as most mtb wheels are 26 inch.
No.
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.
1.You should look for material and frame of the mountain bikes (The bike made with aluminum alloy is the most commonly considerable mountain bike) 2.Check the type of brake (Disc type or rim brakes) Always go for Disc type. 3.Wheel size of the bike is another important factor. More choices of mountain bikes are here,outdoorpursuites/best-hardtail-mountain-bikes/
A bike for a 4 year old normally requires stabilizers, unless at least he or she is able to ride solo. A typical bike that suits this purpose is one with a mountain bike (MTB) frame.
If you want a mountain bike for trials, I would suggest any bike under 25lbs with non-curved tube frame, under 14 inch frame size.
The size of a child's bike ranges from a 12 inch wheel size for ages 2-5 to a 24 inch wheel size for youth ages. Usually a child with a height of 28-38 inches will need a 12 inch wheel size while a child that is 48-60 inches tall will need a wheel size of 20-24 inches.
Most of the time, the tire will have the size on it. If not, you can look the size up online or have your local bike shop check the wheel size.
The best dirt bike for a would be a Honda CRF 100 for a male and a CRF 70 for a girl. Of course the real size of the bike depends on the size and experience of the rider.
Depending on the length of his/her inner leg is depending what size bike he/she can fit on but the majority of 12 year olds ride a 85 (small wheel or big wheel depending on the length of the riders inner leg)
There's no fixed answer to that. The best bike would be the one best suited to your riding, your size and your wallet. If you want one that doesn't suck horribly if you have to ride it a few miles on roads, get a XC (cross-country) one.
The revolutions per minute of a bike wheel depends on the size of the wheel, the speed you are riding, and other factors. It is generally thought it can spin at 2 revolutions per second.