Sprocket Ratio Question

[binge]

Right, Probably one for Keith here.


My pit bike is running rather well, It has a bit more top end power in it, But wont get there because it splutters. Carb needs setting up.

It currently gets to about 66mph before it splutters. So running properly, I know it will get to 75mph easily.


Current gearing is:

428 Pitch Chain
16t Front
39t Rear
12" rear wheel with a 130/70-12 tyre.
I make the rolling circumference 1524mm


It pulls really well on this gearing, and will easily pull off taller gearing.


Sprockets I have are:


17t front
35t rear




How can I work out the top speed with just the 17t Front fitted, And then just the 35t rear fitted.

And then both 17t front and 35t rear fitted.




Cheers




Ben

[P.addy]

you could try matching your bike to a bike on the list and then customising your sprocket and chain set
https://www.gearingcommander.com/

[Kickstart]

Hi

Gearing commander will give you the basics. Current gearing will give you 81mph @10250rpm.

All the best

Keith
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Traxpics, track day and racing photographs - Bimota Forum - Bike performance / thrust graphs for choosing gearing

[binge]

Cheers Keith.

Well if I run the taller gearing setting of the sprockets. 17t/35t. It will do 96mph.

Dropping the rear to a 33t would give me 101.8mph @ 10250rpm. Providing it will pull to said rpm.