Sprockets Lots of hills what sprocket is best?

[hadleyhero]

Hi this is my first post. I have been reading lots of post since I joined and have learned alot. I live in western PA with many hills. What size tooth sprocket will give me more power to go up hills and will I lose speed by increasing the sprocket teeth. any help will be greatly appreciated!
thanks Jill

 

[Fabian]

If you have a lot of hills in your area, there is only one solution to your problem: a SickBikeParts shift kit.

It's the only solution that works.

 

[hadleyhero]

Ok Will check it out thanks.

 

[Cali-Rider]

If you prefer not using a shift kit, and don't mind staying at lower speeds there are modifications that you can do to increase the torque of your motor. You would be able to use the standard rear sprocket but have more power at the low end of your RPM range. Jaguar has TONS of info regaurding the subject but what I found were the most helpful were these:

Champher (round) the piston where the transfer ports are:
http://www.dragonfly75.com/motorbike/pistonramp.html

Lengthen your intake manifold to about 5"-6"
http://www.dragonfly75.com/motorbike/EIntake.html

Lengthen your exhaust:
http://www.dragonfly75.com/motorbike/ExhExt.html

I have the shift kit and it does work well, but it does leave about 10x more things to go wrong, which isn't fun when you live in the mountains. I would also look into a better rear sprocket to hub adaptor.

 

[jeffuehrer]

Hi this is my first post. I have been reading lots of post since I joined and have learned alot. I live in western PA with many hills. What size tooth sprocket will give me more power to go up hills and will I lose speed by increasing the sprocket teeth. any help will be greatly appreciated!
thanks Jill

Welcome to the forum Jill. The more the teeth on the sprocket the more the torque (50 tooth). Less teeth equals more speed (30 tooth). I have a few hills in my neighborhood and a 44 tooth works perfectly. Keep in mind though more teeth will also give you more vibrations.

 

[crassius]

you might try lifting your needle one notch to get a bit richer at hill climbing speeds

 

[Fabian]

Hi Jill

As the other members have pointed out, more teeth on the rear sprocket will give more hill climbing power, but you will have reduced top speed, and vice versa, less teeth on the rear sprocket will give you less hill climbing power but more top speed.

If you want the best of both worlds, i.e. excellent hill climbing power and good top speed, you will need to purchase a SickBikeParts shift kit, that sends engine power through to the rear cassette, enabling you to change gears when going up hills, just like a car fitted with a (manual) stick shift gearbox.