Quote:
Originally Posted by StilOwnMy1stCar
I had some real concerns also with the backspacing. After looking around on the forums and web, I have found some guys with 245/45-17 and 5" b.s., but the majority are 17x8 with 4.5 or 4.75 b.s. I use CAD for a living and was planning on getting the specs for the tires when I pick them out and drawing a section view that I can tape to the rim to see if there is any obvious interference before I buy anything. Here is my email to Yearone about the backspacing:
"I want to order a set of the Yearone Cast Magnum wheels for my 69 Camaro, but I am not sure what backspace to order, 4.5" or 5". I know the 17x8 with the 4.5" BS should fit fine, but the 17x9 with the 5" BS looks like it has a deeper dish on the outside (trim ring area on stock wheels) which is what I want. I am planning on running a 245/45-17 tire on all four corners. I am open to running a 235/45-17 tire to get the stance right. Right now I have stock suspension and drum brakes, but after the rim install, I am going to lower the car so the top sidewall is covered by the fender lip and install a 13" brake kit. My question is will a 5" BS rub with the stock suspension?"
Response: "Thank you for contacting Year One.
Due to car-to-car production tolerances and also due to possible unknown chassis, suspension or sheet metal issues our internal policy is to not recommend oversize tires or wheels. We recommend careful measuring or using a tire/wheel simulator if oversize tires or wheels are desired. We also recommend measuring both sides of the car as we sometimes find less clearance on one side.
During our trial fitting the 17 x 9 wheels cleared the stock suspension. Any scrubbing noted was only of the tires. The tires sizes you are considering are narrower than the tires we trial fit so that should help.
Follow up from me and YO: "Can you tell me what size tire rubbed? I would prefer to fit the largest tire I can" "We were using 275-40-17 tires."
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I don't think they were using 275's up front. On the rear they may clear, but are 1/4" further out than the 17X9.5 with 5.5" bs, which is snug. Rolling the fender lip might make it work fine in the rear, but it won't work up front without a lot of rubbing. Stick with the 245's on the front, though I don't think that 9" wheel will work; maybe if the car isn't real low, but not lowered like you want to do. The ideal combo up front is a 17 X 8" wheel with 4.75" bs and a 245 tire; the one you have coming is 3/4" further out than that, I think it will rub badly. 275's have been done up front, but they used a different wheel and offset, plus you need to limit steering so it doesn't rub on the frame.