Racers or race engine specialists, rear sprocket knowledge needed!!!

[Chop-chop]

If your setup is not at all torque-challenged, 11t at the front and 27 or 28 at the rear would be the way to go - however do keep in mind that you may not be able to use a 3-point hub adapter with the 27 tooth as it's too small to work. The only way u can physically fit a 27t is by using the 6-bolt disc rotor mount.

 

[Street Ryderz]

If your setup is not at all torque-challenged, 11t at the front and 27 or 28 at the rear would be the way to go - however do keep in mind that you may not be able to use a 3-point hub adapter with the 27 tooth as it's too small to work. The only way u can physically fit a 27t is by using the 6-bolt disc rotor mount.

Have you done this?

In the original post the poster's use of the term screaming at 43 mph did not indicate alot of torque or rpm since with his setup 43 mph is only 7k rpm, and that being just above the engines rated out put which is normally asperated and stock muffler/no pipe is not what most would consider any real gains and in fact if he'd have gone up to a 36 or 40t he'd have gone faster with way better throttle response.

I run 11/30 gearing and trust me, it takes double the torque to pull that and be able to unload it up to 10-11k.

Below a certain rpm, depending on the timings, it's all engine until the ports come into play and trying to pull a smaller gear in this area properly takes more understanding of how to produce that torque than many will ever learn, and this is why their modified engine efforts don't produce what they thought they would and end up going slower than a good stock setup!

 

[mountain80]

Speed/Ratio Calculator

* Enter Parameters Below * Motor Speed RPM (example: 8000) * Motor Sprocket Teeth (example: 10) * Wheel Sprocket Teeth (example: 36) * Tire Diameter Inches (example: 26) Speed and Gear Ratio Calculation Results Top Speed: MPH Gear Ratio: :1 Rollout 75% Speed

smolikperformance.com

 

[mountain80]

With what? Funny how you busted my balls saying this couldn't be done, yet now your claiming higher r's and speed than I posted,LOL I've still not got over 73,72.8 to be honest with 11/30 gearing and that's only 10,600 rpm so that the engine stays together, Think we are going to need some proof of that!

That speed is 100% correct according to the calculator. Math cannot lie.

 

[Street Ryderz]

That speed is 100% correct according to the calculator. Math cannot lie.

What speed is correct, what math?

 

[Karl Snarl]

Have you done this?

In the original post the poster's use of the term screaming at 43 mph did not indicate alot of torque or rpm since with his setup 43 mph is only 7k rpm, and that being just above the engines rated out put which is normally asperated and stock muffler/no pipe is not what most would consider any real gains and in fact if he'd have gone up to a 36 or 40t he'd have gone faster with way better throttle response.

I run 11/30 gearing and trust me, it takes double the torque to pull that and be able to unload it up to 10-11k.

Below a certain rpm, depending on the timings, it's all engine until the ports come into play and trying to pull a smaller gear in this area properly takes more understanding of how to produce that torque than many will ever learn, and this is why their modified engine efforts don't produce what they thought they would and end up going slower than a good stock setup!

I used to be one of those guys long ago. Till I remembered what my dad and about every other male figure in my life said when I was a kid, " What are you , stupid? Don't be stupid, we have enough idiots in the world."