sprocket help

[HSV_Hunny04]

What size sprockets would best suit a 140cc for riding hills and farm land and some forestry?? as the one on it is a 15 tooth on the front

 

[8r3nd0]

What's on the back? 15/41 is pretty standard mate but for paddocks and a little less torque for hills I'd just drop the back one tooth.

 

[nickv1980]

14T or 15T front will be fine smaller front sprocket will give you less speed but better take off and low end power . i run 14/39 on my 150 but it revs to the moon so i still get the best of both worlds decent speed and great low end power

 

[Barnesd09]

Have a go with this spreadsheet. May help with selection and if you play with the numbers if will give you an idea what changing sprokets does for speed.
Higher speeds take longer to achieve.
View attachment gearing calc.xls

 

[HSV_Hunny04]

ok thanks for your help will look in to it further thanks again