These are nice because they have the bolt to secure the spacer to the hub replacing the bolt holding the rear rotor. These wouldn't work for me because I change my back wheels very often and put the stocks back on. It would be just another procedure making me late to the track. If I was using these spacers to permanently install my rear wheels, I would consider this style. Any of these hub centric spacers do snap into the wheel very tight, and unless the hub centric ring is a perfect fit the wheel would have to be tapped on with a rubber hammer to properly sit on the hub. I pushed them on my 2nd set of wheels and they fit very tight and stay on the wheel not the hub. I think with the 20mm spacers you will need to get a little longer lugs. I think part of my problem was that I didn't get enough lug into the hub. The 15mm still gave me the clearance I needed and add 5mm of lug depth without hitting the parking brake mechanism inside the rear rotor. Good luck.Cruzinquick