Sprockets

Has anyone noticed changes to anti-squat when changing sprockets? I am considering going to 42 to help reduce anti-squat when I raise (slightly) the rear with the adjustable lower mount on the Ohlins.
 
Has anyone noticed changes to anti-squat when changing sprockets? I am considering going to 42 to help reduce anti-squat when I raise (slightly) the rear with the adjustable lower mount on the Ohlins.

Lower gearing moves the torque lower in the rpm's, which technically would make the bike want to squat more, as there is more torque sooner, speeding up the weight transfer when you launch the bike.
However, that should be a minimal if noticeable effect on most street bikes.
But, proper suspension setup and adjustment for the bike's use, is going to be the real determining factor in how it handles at any point.
 
Lower gearing moves the torque lower in the rpm's, which technically would make the bike want to squat more, as there is more torque sooner, speeding up the weight transfer when you launch the bike.
However, that should be a minimal if noticeable effect on most street bikes.
But, proper suspension setup and adjustment for the bike's use, is going to be the real determining factor in how it handles at any point.
Hey six, I am rereferring to chasing the anti-squat percentage back down as I raise the rear ride height and increase the swing arm angle.
Essentially reducing the size of the rear sprocket or increasing the size of the front (or lowering the pivot point) will reduce the amount of anti-squat percentage for a given swing arm angle.

I am wondering if anyone has noticed the changes to anti-squat with the 40-46 rears most of us are running.

1719347322766.png
 

Attachments

  • Anti-Squat Sportbike Suspension Tuning.pdf
    830.5 KB · Views: 45
If going with a 520 EK 3D and a 42 CreaCarbon rear sprocket any recommendations for a 520 18 tooth front?
 
How does this look for a 520 conversion then. Thinking about ditching the CreaCarbon rear sprocket idea.
Any better suggestions?

Front sprocket SL CrMo 18 tooth (same as the GSX-R 2017 - 2022)
1719615034561.png


DID 520ZVM-X (seems to be the lightest of the heavy duty 520s vs RK520ZXW EK520Z3D EK520ZVX3 etc.)
1719615312267.jpeg


SL RSX Steel 42 tooth for the Rotobox wheels.
1719615529467.png

 
I did a 520 conversion with Vortex sprockets and rear aluminum on my '03 Gsxr1k(530 stock), and my friend's 2018 Gsxr1k(525 stock) last year.
A D.I.D chain on the '03, and an EK on the '18
Both bikes lost over 2.3 lbs...which is alot of rotating mass.
My '03 is still an unfinished project.
The '18 has over 2k miles on the 520 conversion...and the chain still does not need adjusted.
 
How does this look for a 520 conversion then. Thinking about ditching the CreaCarbon rear sprocket idea.
Any better suggestions?

Front sprocket SL CrMo 18 tooth (same as the GSX-R 2017 - 2022)
View attachment 1684913

DID 520ZVM-X (seems to be the lightest of the heavy duty 520s vs RK520ZXW EK520Z3D EK520ZVX3 etc.)
View attachment 1684914

SL RSX Steel 42 tooth for the Rotobox wheels.
View attachment 1684915

That looks like a great setup
 
That looks like a great setup
Thanks Six,

If I want to go Aluminum on the rear sprocket it looks like the K-Factory M1s only come in 530
It might be tough to get a 520 CreaCarbon
We can get a 520 Vortex in the F5 PTFE Hardcoat

Assuming it is a more sensible option with a 520 conversion to stick with steel sprockets. Anyone have weights for the RSX and RST Superlights?
 
Some more data points:
  • SuperSprox Stealth 530 / 44 0.521kg so a 520 / 42 should be around 0.475kg
  • Rotobox Alloy 520 / 42 0.341kg
  • CreaCarbon 520 ./ 44 0.311kg so 42 should be 0.284kg
  • Superlite RST Steel 520 / 42 0.675kg
  • Standard Steel 530 / 43 0.957kg so a 520 / 42 should be around 0.7kg
 
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