Even to even number of teeth or odd to odd gives a number that ends with an eighth, odd to to even gives number that gives a half ending, adding a half link to either adds a quarter inch. 28 13 should be slammable, or at least really close depending on chain stretch.
A good chain will have a 16th stretch, and the slope of the chain takes up that slack. you could go 13.875 with that ratio. A 23 tooth sprocket should do the trick... and you'd need a half link.
Could always have it ground down to 13 5/8 and it would slam perfectly no half link. Don't know the exact radius of a mac 2, but it is probably at least an eighth shorter than the 2.1 SB8 I used to find clearance. doubt it would fit at 13.5 though, sooo...
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Could always have it ground down to 13 5/8 and it would slam perfectly no half link. Don't know the exact radius of a mac 2, but it is probably at least an eighth shorter than the 2.1 SB8 I used to find clearance. doubt it would fit at 13.5 though, sooo...
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