Best gearing for 18s

[FL-R]

I have a 86 bottom end, 89 long rod, ESR 310 ported for MX. I have 18s on the rear and thats all I run, I ride mostly MX but also alot of tight trails and hill climbs, but its all sandy. I have been runnin 13/39, but I recently changed to 14/38 and it seems a bit to tall. Has anyone ever ran 14/39 or 13/38 and had good luck.

[250r grave yard]

try it out you already seem to have the sprockets

my 265r had pipe carb advance timing and port work and it ran 14/36 with no bog

[86 Quad R]

with 18's you should be able to run a 14/38 with no problems at all running a 310. :cool:

[ZSNOW]

My 265 is running 13-38 and it pulls it too easy, im accually thinking about gearing to a 13-37..since all i do is roast the tires off coming out of corners.

[8686]

Originally posted by ZSNOW
My 265 is running 13-38 and it pulls it too easy, im accually thinking about gearing to a 13-37..since all i do is roast the tires off coming out of corners.

You should try 14/38 or 14/39. The larger sprockets will last longer and be easier on your chain.

[mxduner]

i have about the same setup as yours, and 14-38 is a hair tall for me to... except it is with 20" tires. with 18's i shoud easily pull 14-38 or even 14-36 as stated from others. Lets hear more about your setup. Which pipe do you run? which carb and reeds?

[FL-R]

I have a bottom end esr pipe, 38 A/S, and some boyseen carbon reeds.

[250r grave yard]

you should be rippin up a 14/36 sprocket setup with that

did you advance the timing

[86 Quad R]

Originally posted by 250r grave yard
you should be rippin up a 14/36 sprocket setup with that

did you advance the timing

X's 2 agree'd

[FL-R]

It runs out real good, No I have not done any timing mods yet. Its only been in the woods with these gears, i will be on a track this weekend and report back

[312R1]

I run 15-38.