Originally posted by Vegassc400
Stock wheels weigh in around 45 to 48 pounds. 20's will be around 65+ pounds. I'd sure do it.
The Supra TT brake upgrade is the most popular. Do a search on your options.
In a very simplistic view of the problem:
use Mass x Velocity x Radius for angular momentum
the radius 8 inches for the 16 inch rims
the radius 10 inches for the 20 inch rims
Let's just assume the weights will be equal since the 20s will be made out of lighter and more durable materials (hopefully)
that leaves a simple ratio based on the radius since we are assuming the same weight
that comes out to 25% more momentum on the 20" rims
if you add more weight then this will increase as well
This also correlates with at least 20% less stopping power. The brakes on the cars are spongy so I would not recommend the rim upgrade without a brake upgrade unless you buy something real light. Even then the small brakes look funny.