I put a set of 8 tooth drivers on my 2003 RX-1 and it gave me lots of clearance.It originally came with the 9 tooth.I would also recommend the extrovert drivers to stop the ratcheting and plus you can run your track a lot looser and makes it easier on the slide rails.By installing the 8 tooth drivers,you are changing the gear ratio and if you did not want to loose your top speed,you will have to change the gears in your chaincase.The 8 tooth gives you a really good bottom end pull but you will loose approx. 10 mph on top end.Hope this helps.Jeff