I checked out those 20inch SB Niche Misano m117s, they look good. The 10.5 with the 315 tires may be to wide going into the shocks and sway bars. My 10inch with 295 tires are close. The 315 is only about 3/8 inch wider than the 305. The 10inch with the 305 tires should be OK, about 15lbs...