The 15T countershaft sprocket came in today. I rushed to put it on, looking forward to tons o' speed! But the stock chain is too damn short for it!! Only one tooth larger than stock, and you can't push the axle far enough forward to fit the thing! That sux! So now I have to get a longer chain but how long ?? I honestly thought some of you guys said you could easily run a 15T with the stock chain, but it's impossible. What's the deal ? ? L.L.