about as big as they always was
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)
Yes, both in physical size and hp.
The big wheel bike is called a "penny-farthing."
You would fit, but if you're still growing, I'd recommend a bigger bike such as a 125cc. If you're stuck on two stroke bikes (like me) then you should buy a used 85cc because you will grow and need to switch to a 250cc in about a year.
Depends on height and weight.
yeah you can BUT your going to have to buy a new swing-arm new wheels+tyres new sprocket and a new rear brake line. hope this has helped.
The big wheel is the front.
For professional motocross, the biggest bike that is allowed to be raced is a 450 four-stroke. For local race purposes there is a Vet class that allows any size bike to be raced (usually up to 525 since that's the biggest motocross bike that KTM makes).
Motocross is a big sport?
The CR85R expert cannot race in the regular 85cc class in the AMA. A cr85r expert can race in any desert race in the 85 class, including AMA. In motocross its a different story, it depends on what the rules of the track are. Most of the they have a special class for the 85 experts but the problem is that they line you up with the 125 two strokes, and a 125 two stroke is compared to a 250 four stroke so your racing with the big bikes. Hope I Helped, KEEP RIDING!!!!!!
the penny farthing
i have a ktm 85sx and a kx 85 small wheel. i am a midgit but i can ride them. i am twelve. this should help. a kx 85 big wheel is an awesome bike. although if he or she is small it will be too big. a ktm big wheel is expensive but is worth it. it is still quiet big. these are some seat heights kx 85 = 840mm ktm 85 sx = 850mm rm 85L = 850mm cr 85 = 860mm yz 85 = 840mm but all these are ajustable my bros 14 and he rides a ktm 85sx big wheel. he is 170cm tall.