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Rear wheel offset question for Dart owners #567500 12/30/09 11:48 PM 12/30/09 11:48 PM
Joined: Jan 2003 Posts: 5,653 Detroit area 6PAX OP master
6PAX OP master Joined: Jan 2003 Posts: 5,653 Detroit area	I have a question for Dart owners who have ordered custom offset wheels for their cars while still using the stock length rearend. I'm trying to figure out what rear offset to order when I order a pair of rear wheels for my 70 Dart. I want to order wheels that will be as close to centered in the wheelwell as possible. I have taken a bunch of measurements based on the wheels I have on the car now which are off-center to the outside. They are 15x8 with 4 1/4 backspacing. Based on my measurements it looks like 4 5/8 backspaced wheels would put the center of the wheel in line with the center of the wheelwell. I was just curious if any other Dart owners have done this and if so, what have you come up with for a rear offset? Does my 4 5/8 estimate sound about right?

Re: Rear wheel offset question for Dart owners [Re: 6PAX] #567501 12/31/09 12:28 AM 12/31/09 12:28 AM
Joined: Feb 2003 Posts: 101 Oregon R RoadRaceDart member
RoadRaceDart member R Joined: Feb 2003 Posts: 101 Oregon	You want 1/4" positive offset wheels. Take the wheel width, add 1" for the lips of the rim, divide by 2 and add 1/4". So if the wheel is 7" wide this is 4 1/4" backspacing. 8" wheel 4 3/4" backspacing. 10" wheel 5 3/4" backspacing. Your measurements are very close, but you want the wheel to be slightly closer to the spring than the body to avoid rubbing in corners. I have 17x9" wheels under my '67 Valiant and they just squeak in there with 255/40R17 tires. Joshua

Re: Rear wheel offset question for Dart owners [Re: RoadRaceDart] #567502 12/31/09 08:30 PM 12/31/09 08:30 PM
Joined: Jan 2003 Posts: 5,653 Detroit area 6PAX OP master
6PAX OP master Joined: Jan 2003 Posts: 5,653 Detroit area	Quote: You want 1/4" positive offset wheels. Take the wheel width, add 1" for the lips of the rim, divide by 2 and add 1/4". So if the wheel is 7" wide this is 4 1/4" backspacing. 8" wheel 4 3/4" backspacing. 10" wheel 5 3/4" backspacing. Your measurements are very close, but you want the wheel to be slightly closer to the spring than the body to avoid rubbing in corners. I have 17x9" wheels under my '67 Valiant and they just squeak in there with 255/40R17 tires. Is this based on the wheelwell lips not being trimmed at all? If so, if I were to remove 1/4" from the wheel lip I could then go with a 5" BS wheel, correct?

Re: Rear wheel offset question for Dart owners [Re: 6PAX] #567503 01/01/10 05:34 PM 01/01/10 05:34 PM
Joined: Jan 2003 Posts: 5,270 Missouri M MY340 master
MY340 master M Joined: Jan 2003 Posts: 5,270 Missouri	Quote: I have a question for Dart owners who have ordered custom offset wheels for their cars while still using the stock length rearend. I'm trying to figure out what rear offset to order when I order a pair of rear wheels for my 70 Dart. I want to order wheels that will be as close to centered in the wheelwell as possible. I have taken a bunch of measurements based on the wheels I have on the car now which are off-center to the outside. They are 15x8 with 4 1/4 backspacing. Based on my measurements it looks like 4 5/8 backspaced wheels would put the center of the wheel in line with the center of the wheelwell. I was just curious if any other Dart owners have done this and if so, what have you come up with for a rear offset? Does my 4 5/8 estimate sound about right? \|I believe with 4-5/8" backspacing you'll have little or no clearance bewtween the tire & spring without wheel spacers or offset shackles. \|What's your tire to leaf spring clearance right now\|? 1970 FE5 Duster 360/904/3.91's SOLD 1973 TB3 SpaceDuster 340/4spd/4.10's SOLD Moparless for now but when the opportunity is right I'll have another one.

Re: Rear wheel offset question for Dart owners [Re: MY340] #567504 01/01/10 05:54 PM 01/01/10 05:54 PM
Joined: May 2004 Posts: 533 North Dakota 440abody mopar
440abody mopar Joined: May 2004 Posts: 533 North Dakota	I had Stockton Wheel make me a set of 15x7's with 4.75 inches of bs for my 73 Swinger, and have about a 1/2 inch of clearance from the sidewall of my tire to lip of the quarter panel as well as the spring using a 255-60-15 tire. That was the widest tire I could get under the car with out moving the springs inboard. Hope this helps, if not I can take a few pics if you need them. 5703908-dartrightrear08.jpg (89 downloads) 73 Dart Swinger 440/727 8.75 w/3.55's 34 Ford 3w coupe with a soon to be 1958 392HEMI!

Re: Rear wheel offset question for Dart owners [Re: 440abody] #567505 01/01/10 08:00 PM 01/01/10 08:00 PM
Joined: Jan 2003 Posts: 5,653 Detroit area 6PAX OP master
6PAX OP master Joined: Jan 2003 Posts: 5,653 Detroit area	Quote: I believe with 4-5/8" backspacing you'll have little or no clearance bewtween the tire & spring without wheel spacers or offset shackles. \|What's your tire to leaf spring clearance right now\|? I am in the process of installing an offset shackle kit so clearance on the backside of the tire shouldn't be a problem.

Re: Rear wheel offset question for Dart owners [Re: 6PAX] #567506 01/07/10 11:37 AM 01/07/10 11:37 AM
Joined: Jan 2003 Posts: 5,653 Detroit area 6PAX OP master
6PAX OP master Joined: Jan 2003 Posts: 5,653 Detroit area	If anyone else has had any experience on this topic I would appreciate your input. I an preparing to order wheels with custom backspacing and I want to make sure I get it right since I won't be able to return the wheels.

Re: Rear wheel offset question for Dart owners [Re: 6PAX] #567507 01/07/10 12:32 PM 01/07/10 12:32 PM
Joined: Aug 2005 Posts: 11,543 chicagoland,usa B buildanother I Live Here
buildanother I Live Here B Joined: Aug 2005 Posts: 11,543 chicagoland,usa	Had lil red-warlock etc, 15x8 slots on a 69 dart re-drilled stock axles, and they were IIRC 4 1/2" backspace. Don't think I had moved the springs in the 1" shackle way, but the 26x8 slicks were close enough to outer lip, that I did trim it down some. 20 years ago, a little foggy on the memory.

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