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Hey Joel, are you running a 35 or 219 chain? I run 219 chain and run sprocket gears from 64 – 70 here at the local tracks and drivers (on the clutch) 17-19. You defiantly want to hit the top end as that is where the torque is at. For example at IMI at CKT everyone would hit the limiter at the end of the long straight and some hit it at the end of the back “straight” start/finish line.
Now, don’t get me wrong you don’t want to live on the limiter. It is a balance between the acceleration and top end speed. What I recommend is gear so that you hit the limiter more than you think and dial in from there.
Use the limiter on the longest straight as a tuning tool. You want to hit the limiter right before you are about to break for the turn coming off the longest straight. That is a general rule. Some like to sacrifice top end speed for acceleration for short tracks that need more acceleration than top end.
Thanks. I have been running a 219 chain with gearing from 65-68 and with an 18 in the front. I just put a 19 on it but have yet to run a race since making the switch I just didn’t want to get the gear ratio to low and smoke the clutch I just wasn’t sure where the safe zone is when it comes to gearing. Thanks for the help!
@Joel Small wrote:
Thanks. I have been running a 219 chain with gearing from 65-68 and with an 18 in the front. I just put a 19 on it but have yet to run a race since making the switch I just didn’t want to get the gear ratio to low and smoke the clutch I just wasn’t sure where the safe zone is when it comes to gearing. Thanks for the help!
The clutches should be fine with any gearing choice you make. A 67 18 seems to be a good place to start and then go up and down on the back sprocket in order to get close. The other drive gears are for fine tuning. That is what I recommend is focus on an 18 drive gear and start with a 67 and if you hit the limiter too soon drop a tooth on the rear. If you are not hitting the limiter add a tooth to the rear sprocket. Once you have it close you could use the other drive gears to fine tune.
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