Topic: I make big big bo boo
in Forum: C3 Engines, Driveline and Handling
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I know I know. If I know so much why am I have so much trouble? Trial and era baby. I have been going at this for days. Reading and asking lots of questions. You spend a lot of money on wheels and they are the wrong size and you can not take them back. You will learn a whole lot and fast.
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Lifetime MemberManteca, CA - USA
Joined: 11/20/2005
Posts: 3623
Vette(s): 1978,two tone,Metalic Rootbeer & gold
1975 L48 4 speed
Frank, I have not seen that variety. My only aquaintence is with the plate that fits over existing studs and takes up 1/2" or so of threads. Sounds like some one has been looking at this problem.
Jimmy B.
Just can't wait to get on the road again. 
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[QUOTE=frstvette]Offset:
The distance from the centerline of the wheel to the wheel bolt up face, and is described as Positive or Negative.
Positive Offset describes the bolt up face and outside of rim is farther towards the outer part of the wheel.
Negative Offset Offset describes the bolt up face and outside of rim is farther towards the inner part of the wheel.
Backspace:
Backspace is the distance from the edge of the inner rim to the wheel bolt up face.
The width of the rim determines the centerline and from there you can calculate backspacing and offset:
Complete Info Here
Example: On a 10" rim, centerline is at 5". A 4.5" B/S is 5" - 4.5" = .5" positive offset (outer rim face away from the bolt up face). Changing to a 4" B/S is 5" - 4" = 1" positive offset. So while a 4.5" B/S pushes the rim out .5", a 4" B/S pushes the same rim out 1". [/QUOTE]
The distance from the centerline of the wheel to the wheel bolt up face, and is described as Positive or Negative.
Positive Offset describes the bolt up face and outside of rim is farther towards the outer part of the wheel.
Negative Offset Offset describes the bolt up face and outside of rim is farther towards the inner part of the wheel.
Backspace:
Backspace is the distance from the edge of the inner rim to the wheel bolt up face.
The width of the rim determines the centerline and from there you can calculate backspacing and offset:
Complete Info Here
Example: On a 10" rim, centerline is at 5". A 4.5" B/S is 5" - 4.5" = .5" positive offset (outer rim face away from the bolt up face). Changing to a 4" B/S is 5" - 4" = 1" positive offset. So while a 4.5" B/S pushes the rim out .5", a 4" B/S pushes the same rim out 1". [/QUOTE]
Good info - thanks Frank! 
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Bladenboro, NC - USA
Joined: 1/22/2006
Posts: 1058
Vette(s): 1972 conv., sunfire yellow, blk interior, blk vinyl and convertible top. Off frame restoration with American Speed 383 stroker engine producing 500hp plus a 200hp NOS system. MSD ignition. Hooker super competition headers with chambered exhaust.
Lifetime MemberModerator
Moses Lake, WA - USA
Joined: 4/16/2005
Posts: 2134
Vette(s): 1976 L48 4-spd, Mahogany Metalic exterior, Buckskin interior 350ci/350hp, 3rd owner, fiberglass spring, 255/50-16's Torq-Thrust II
Guys that are running the wide wheels have to move the brake cable bracket from the side of the trailing arm to the top. If you have to off set the sway bar then you may need to go with offset trailing arms.
in Forum: C3 Engines, Driveline and Handling
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