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View Full Version : Help with front and back sprockets


SLSD400exGUY
03-15-2005, 01:42 PM
what would be the BEST front and back sprockets(teeth size) to pick up speed?
47501exracer
03-15-2005, 01:49 PM
If you want speed, go with a 16 tooth front or you could drop a couple teeth in the rear. I think with a 16T front the sprocket guard might not fit. Correct me if I'm wrong guys. Remember with these changes you will lose low end torque.
no limit
03-15-2005, 02:23 PM
going to a 16 tooth you do need to remove the case saver, which is kinda nice to have when your chain snaps. yound be better to leave the 15 front and go smaller in the back
my400exrules
03-15-2005, 05:13 PM
they r right 15 or 16
SLSD400exGUY
03-15-2005, 05:31 PM
okay 15 front what size back???
redhondi400
03-15-2005, 05:37 PM
36 may work for you. 2 teeth in the back is like 1 tooth up front I think.
47501exracer
03-15-2005, 05:39 PM
That's correct. Try that out first.
SLSD400exGUY
03-15-2005, 05:46 PM
okay cool ill have to try that out.

Also what is the stock front and rear sizes? im to lazy to run out side right now lol.

thanks
RednEX
03-15-2005, 05:58 PM
15/38
SLSD400exGUY
03-15-2005, 06:05 PM
what if i went with a 14T front and a 36T rear? would it help in going any faster?

the reason im asking this is my friend has a 400ex but upgraded to a 440 kit and i cant keep up with him. ill do this stuff frist and when i get the money ill up too.
blue416ex
03-15-2005, 06:06 PM
hold up i thought when u dropped teeth in the rear it lowered your top speed and increased tourque and bottom end grunt and when you increase the rear it gains speed and loses bttom end grunt ???:confused: :confused:
SLSD400exGUY
03-15-2005, 06:07 PM
i dont know. Thats why im asking lol

what if i went with a 14T front and a 36T rear? would it help in going any faster?

the reason im asking this is my friend has a 400ex but upgraded to a 440 kit and i cant keep up with him. ill do this stuff frist and when i get the money ill up too.
blue416ex
03-15-2005, 06:13 PM
im in the same boat as you SLSD400ex i ave a 15t front and a 39 and a 36 rear i have my 36 on now but i want a little more grunt and not as much topend im a little ok ALOT confused on gearing someone please axplain this for us ( i think were both completely lost pon this) :confused:
SLSD400exGUY
03-15-2005, 06:24 PM
ye my friend bump down on his front and it added a bit more torque.

so im not sure!!
RednEX
03-15-2005, 06:24 PM
Go to this site and type in what gears you have and make up a MPH if you dont know exactly. and keep changing the gears till you come up with what you want.

Just a heads up you need a lot of motor to pull a tall gear so dont try to go to fast or it will take you a mile to get up to top speed.






http://www.bluetraxx.com/gearratio_calc.htm
SLSD400exGUY
03-15-2005, 06:28 PM
thanks that will help me out big
RednEX
03-15-2005, 06:30 PM
on average you will change 5 MPH for every tooth on the front and 2MPH for every tooth on the back.
blue416ex
03-15-2005, 06:32 PM
one specifically for the 400ex!!!

http://home.earthlink.net/~gellett/400ex.htm

have fun :devil:
SLSD400exGUY
03-15-2005, 06:55 PM
even better