EMS wrote:Without going into a detailed calculation with lengths, radii and diameters, a quick estimate:
From 40 to 38 teeth is a 5% reduction in circumference, ergo in diameter. 4 links out of 108 is close to 4%, which means it is probably right. 4 or 5 links shorter chain will suffice. You can pick up any variation by adjusting the chain.
Will wrote:
You are comparing chain length to sprocket circumference. That doesn't work. Going from 40 teeth to 38 teeth is a 2 tooth reduction in circumference. The sprocket doesn't know how long the chain is.
Without going into a detailed calculation with lengths, radii and diameters
EMS wrote:Will wrote:
You are comparing chain length to sprocket circumference. That doesn't work. Going from 40 teeth to 38 teeth is a 2 tooth reduction in circumference. The sprocket doesn't know how long the chain is.
Following my original statement, Will:Without going into a detailed calculation with lengths, radii and diameters
what do you think will work?
17Mkensith wrote:I too am looking to change my ratio a little I do a lot of highway travel if I go to a 40 t what will i have to get for chain lenght and is 18 t for front
That would be the only one in the world then, right Mike? - An 18 tooth 630 counter sprocket would be a bit of a tight squeezeEMS wrote:Do you have a 79 with an original 630 chain and 18/42 sprockets?
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