Originally Posted by
cubewheels
I'm looking to increase weight even further for safety (lead weights at the back of the frame) for more intense uphill training. It should also improve braking performance which is paramount in chaotic traffic conditions.
Adding extra weight to the frame of a bike isn't going to make handling safer or improve braking performance. It will do the opposite. A loaded bike is a lot more sluggish and more difficult to handle and maneuver than a lighter bike. A 40+++ pound bike travelling at 25 MPH is also going to take longer to stop than a 25 pound bike travelling at 25 MPH.