![]() You’ll note in the drawings above, we took the time to add the rear shock. Here’s what our “illustrations” ( and we use the term “illustrations” lightly!) look like: It’s best to make drawings of both sides of the car, and have one drawing for the inside (brake drum mount surface to the inner wheel well) and another for the outside (brake drum mount surface to the outer wheel well lip). It’s much easier if you have a visual to work with when keeping track of the dimensions and eventually figuring out what will work on your car. The bottom line here is, you absolutely must measure both sides. It could be where the spring perches were welded to the housing and so on. It could be manufacturing tolerance stack up. Most cars vary dimensionally from side to side. Move to the other side of the car and start all over again. Repeat the process with the inside and outside measurements at horizontal, 90-degrees and 45-degrees front and back of center. The raised lip on the register skews the dimensions.ģ. Never clamp over the axle register in the drum. At the same time, take measurements from the brake drum to the outer body (most likely, the wheel well lip). ![]() Clamp a straight edge (in this case, a carpenter’s level) on the brake drum and take measurements from the brake drum mount surface to various locations on the the inner wheel well. Here’s how the common hand tools system works:ġ. We’ll also give you some insight into a special tool that pretty much does it all when it comes to determining backspace. There are dozens of ways to determine rear wheel dimensions, but what follows is an easy way to figure it out using common hand tools. This means that the tire can either be tucked up inside the stock wheel well of your car (which is good) or you’ll have to jack the car up and let it hang out in the breeze. For example, you might be able to purchase a 15- x 8-inch wheel with backspaces that range from two inches all the way up to five-plus inches. Wheels are available in a wide array of dimensions. You have many choices, but you have to get it right the first time as most shops simply won’t accept an exchange if the wheels show any signs of mounting ( can you blame them?). Summit Racing offers 117,000 different wheel items. The big factor in running larger tiresis getting the right backspace wheels. You just have to determine how much “tire” can actually fit within the existing wheel well without creating interference on the inside or the lip. Sure, big rubber could fit if the wheel wells were carved out, but it’s also possible to get some big tires under the back without any real drama. A good example of a wheel well-restricted car is the 1970 Chevy Novashown in the accompanying photos. In some cars, it’s easy to stuff the back-end full of rubber without resorting to reconstructive surgery (tubs, moving springs, moving frame rails and so on). Big back tires have always been the telltale sign of a true ground pounder.
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