Sprocket Gearing for duning and racing up dunes

[JTmachining]

Use the gearing calculator on BHQ to get u close.

[WINDYCITYJOHN400]

13/43 3.30

13/42 3.23

13/41 3.15

14/40 3.07

14/43 3.07

13/39 3.00

14/42 3.00

14/41 2.92

15/43 2.86

14/40 2.85

15/42 2.80

14/39 2.78

15/41 2.73

15/40 2.66

15/39 2.60

 

13, 14, 15

 

39, 40, 41, 42, 43

 

 

 

 

 

CottonBranchRacing

 

The higher the final gear ratio number = Jack Rabbit starts.

 

The lower the final gear ratio number = More top speed.

 

Stock is 14-41

[naoh05]

Ok I get it... But then y would my dad say if I go 13/43 I would be able to pull the dune in 4th gear? Wouldn't I be able to in a different gearing?

[sprinklerman]

Ok I get it... But then y would my dad say if I go 13/43 I would be able to pull the dune in 4th gear? Wouldn't I be able to in a different gearing?

Why don't you ask him and see what his reasoning is behind his advice?

[naoh05]

I love my dad but idk if he really knows y

[CottonBranchRacing]

Jackrabbit lol

[possum]

your dad is onto something. Sounds like he has a clue. On smaller motors I like 16-17 /41 running 1st to 3rd up hills. might be an option. So uour not shifting every half second and still get that mph up

[WINDYCITYJOHN400]

Some people are saying things in the street about a 13 t front sprocket being bad for the chain. Any truth to that?

More teeth on the drive sprocket shares load over more of the chain. But low power bikes that need the gearing aren't really a threat to chain life as much as bikes with Mas Powers.

[CottonBranchRacing]

We put 100 hp on a 13tooth sprocket, it wasn't the chain that went bad

 

it was the sprocket itself

 

 

CottonBranchRacing

[WINDYCITYJOHN400]

This is DDQ's bike tho.

 

37HP isn't going to eat a sprocket.

I know a guy who ran a 12 for a few seasons.