Thanks Bud! I didn't have to do anything with the speedo.. The tires are pretty much the same as stock.. They are about 25 inches tall... Plus as I said before the ABS only has to be calibrated on Chevrolets.. One of the first things I did when I thought about going to the 17" wheels was measured the factory size on my Dad's 92 Ranger so I would kinda know where I needed to be...