Folding Bikes - adding chainring or cog

I got a question to make a bike a bit faster do you add a chainring my bike has a single front 46 and a 6 speed starting with a 14 my bike is kent ultralite 16" wheels and sorry for my stupidity but which is high gear is it the smaller cog or the larger one ?

High gear is the smallest sprocket in the rear.

with 16" wheels it is hard to get higher gears in your case the easiest would be to replace the chainring with a bigger one i don't know if the kent has a replaceable chainring if not then you would need a new crankset as well don't forget in that case you will need to get a longer chain as well that should be cheap since any 6 7 or 8 speed chain would work chainrings come in various bolt circle diameters so check which one your kent has before you buy it would be a good idea to go to a LBS remember to ignore their laughter when they look at the kent

can i change the rear cogs all together is it possible and the front is welded to the crank two piece also what size of chainring can i use

how do you post pictures

I don't think you should change the rear. The smallest 6-speed Shimano freewheels I've seen start at 13t. What you get for your money is 7.7% higher gearing.

You should visit bike shops that carry folders. With a bit of luck, you could score cheap new parts ppl take off when they upgrade. New crank ftw!

no you can't change the rear you will have to do the front if the chainring is one structure then youre out of luck and will need to get another crankset try at the lbs they might have seconds at least they should have some used but good chainrings as for the size of chainring what size do you have now aim for about twenty percent higher number of teeth for example if your current one is fortytwo teeth then get one of fifty teeth but you might as well get a fiftytwo or fiftythree teeth ring they are common as muck you will in all probability need a onehundredandthirty millimeter bolt circle diameter crankset and the possibility is good that you will need a new bottom bracket too perhaps the best bet is to look out for a rubbish heap bike with the right crankset rescue the bike take off its crankset and slap it on your bike maybe with the bottom bracket included

the front is 46 what will happen if i put a higher teeth chainring 52 54 ? i am blind with such adaptations i bought the bike for 80 dollars so i have no problem spending a bit on a crank set whether a one piece or three what about tires what would be a good set .

I looked for a better picture of the bike. As the chains on the other side of the bike.

heres a You tube video of the bike.
http://uk.youtube.com/watch?v=O5Cw1vgIJFQ

The frame has elevated chainstays.
might have problems if you fit a monster chainring. It might hit the frame. Or the chain might.

on 46 chainring to 16" wheel. With a 14 tooth cog.
The gearing is 46 X 16 / 14 = 52.5"
or 3.28 times overdrive. wheel would turn 3.28 times for one turn of cranks.
a 13 tooth freewheel cog would be 56.6"

bigger bikes have top gears that are more than 80".

if you go for a different crank. Maybe a 53 tooth, as thats common on road bikes.
53 X 16 / 13 = 65.2"
still fairly low.