hate to break it to u but this is the 21st century and we do kinda care about funstionality and weight

the tiny things u called are called cogs we dont use freewheels anymore

and those little things in the  front are called sprockets.

we've come a long ass way from freewheels and chain rings

and with those tiny little things there's a simple math equation where the gear ratio is the same on a 45-16(front number is the chainwheel or sprocket and back number is the freewheel or cog) the standard chainwheel and freewheel ration as it is on those tiny little 25-9 like most people ride and even those 23-8 so we can get jsut as much speed as u can with that big chainwheel and huge freewheel even faster if u gear it non standard like 27-9.

while doing this we took off about a half a pound and fixed some major problems with the freewheels breaking.

so u can still pedal ur ass anywhere u want with less weight more functionality and some

Brand SPanking new tiny sprocket thingy's

plus it's alot harder to get the dreaded locking of ur pants in the chain and teeth of the sprocket when it's smaller and more out of the way

so your much less prone to injury

lol

i guess iu was a little harsh but it feels good ot be a smart ass every once and a while

but yeah

the first thing to do is buy a back wheel and see how many teeth it has the buy the sprocket that corresponds with it

here's the chart

these are the standard ones

u can add teeth to front for more speed

1st number is spocket second is rear cog

22,23/8

25/9

28/10

30/11

33/12

36/13

39/14

41/15

44/16

so yeah

just let me know if ur gonna update

i worked at a bike park and store i can turn u towards some good stuff

sounds good

go hit a dirt jump really really fast and when u over clear it land as hard as u can on ur back wheel

then u'll be ready

or do a huge street gap and either case and taco ur wheel or land hard enuff to blow it up