I am going to one down in the front and would like to go two up in the rear and was wondering if a stock lenth chain would fit. I have the 13t on alredy and have to order the 43t. The problem is I want to go riding now and dont want to buy two chains. I know stock length will fit on 13t 41t as it sits now. Will first gear be gone with the new sprockets. I am looking for more torque and bite so am I going in the right direction?