Sprockets & Speed

[mac90]

anyone have this worked out for thick pitch chain sprockets mainly 6 & 7 front-54 & 60 rears the most common??

[urmomzaripper]

Does Anyone Know Whats The Best Teeth Size I Should Go On The Back End If I Changed My Front Sprocket From A 14 To A 16?i Have The Gs-57 Bike.

[Haggard]

all well said fellas.
Originally, I was using a small chain with 6 tooth sprocket and 68 tooth rear.
Well all things wear out and my local dealer didn't have any chains in stock but what he did have was a brand new pocket bike(1 of many) that had a heavier gauge chain and sprocket set(chain gold in color) than the ones I've been using
Thought HEY!! this is the answer .Should last forever. Rear sprocket was same dimension as the ones i was using so bought rear sprocket,chain , clutch bell housing with bell and front sprocket.
Got home and checked and sure enough everything was same size and dimensions and would bolt right on and then I WOKE UP and realized that a heavier chain riding on the same diameter sprocket is going to have less teeth!
And sure enough, I'd just regeared my bike from a

6 and 68 (11.3 to1)ratio

to a

6 and 54 (9.0 to1)ratio

so now I am geared approx. 17% higher. lol

but no probs, I only weigh 230 lbs !!??!! lol yeah right.
anyways my question is why are these sprocket tooth counts not on the above chart, does anyone else use this heavier chain and why would a new stock pb with identical motor, tires etc. be geared that much higher than the rest??
Its a good thing I have pedals to get me moving off the line .
6or 7 pedals with the throttle cranked and i,m off to the races lol

~Haggard~

[RD RACING]

firstly, why do you think a heavier chain combined to the same size diameter sprockets be any different to the smaller gauge chain with matching sprockets. all outside diameters are the same from thin to larger chain / sprockets set ups, the only difference is the spacings of the teeth and chain links. example; a thin chain set with 6-68 is the same as a thick chain with 6 -68. this is why you can,t use either a thin chain on a thick chain sprocket and vise versa. its like trying a motor cyle chain on a push bike. won,t work.

[Hobarthermit]

Reading learning but godda ask silly QU
number of links matter?
Mitch.

[RD RACING]

no difference with extra links. its all to do with how many teeth.

[Haggard]

geez RD RAcing. Your makin my head hurt.!!! let me rephrase my statement by saying both rear sprockets have the same circumference and obviously, a chain with larger links is going to have a smaller tooth count on a same size sprocket(area wise).
just wasn't obvious when i ran into the store on the way home from work!!lol.
my question was ,is anyone else using this chain set and how could there be so much difference in the gear ratios on identical brand new pb's./68/6 on 1 and 54/6 on another.
thanks in advance
~Haggard~
also ,noone curious about the pedals?? : )

[RD RACING]

whats so hard in working this out ? your saying there are 2 sprockets with the same diameters, one is a thin chain size and the other is a thick chain size. the 68 is the thin type and the 54 is the thick type. the 54 has less teeth because of the chain link size. both diameters are equal this is why the 68 and the 54 are equal.

[Haggard]

yeah ok . ty. makes sense to me now. a little slow in the uptake i guess.

[Battle Guardian]

would running a 8 t -front, driving a 60 t rear would be a good combo for speed and acceleration?