Originally posted by HoosierContour:
None, HP is a function of the engine not the wheels. The dyno might tell you otherwise, but your wheels cannot rob you of horsepower.


You are very much incorrect here.

Rim weight and diameter do very much affect the power put to the ground.

Larger diameter rims do so by making the weight you are trying to accelerate a larger diameter weight. This has a very pronounced effect on power production.

That 10lbs unsprung (which is ~40lbs! regular weight for real world driving & handling) per 1" is a good general rule of thumb.

Also more weight in general works the same way to reduce useable power. Then remember to factor in the weight increase on top of the larger diameter.

People may seem to like the bling bling looks of large heavy rims (or worse heavier chromed units) but the performance loss they incur is like shooting yourself in the foot twice. Ugly and performance robbing.

You can probably go with a set of ultra lightweight 17's over the stock 16" and come out fairly close in the power department, but otherwise you are going to take a major hit in performance. I mean a lot more then you can see on a static dyno too!

2000 SVT #674 13.47 @ 102 - All Motor! It was not broke; Yet I fixed it anyway.