Going to be about the Same as 20" Stock Setup, Because of the Width..
Now if the Tires are a tad lighter, you are golden, My New 20" with New tires
were 52 LBS...?, Stock Was 51 LBS...? (tires were roached), I will have to check tho
So you should go FASTER, with more Grip.. WOULD Like to see what your actual weight is