does any one know the gear sizes of the front and rear sprocket on a 1999 300EX
thanks

 

It schould be 13/38. Thats what it is on my 2000. Unless the gearing was diffrent that year.

 

13/38 for a '99.

 

Yep 13 and 38 for all years.

 

If you go with a smaller aftermarket tire such as a 20-11-9 you might want to bump up the front to a 14. I've been running a 14 since I put shorter tires on and it runs so much better. Today I put the 13 back on to see how it runs, didn't like it at all. Had to keep shifting and no top end at all.