backspace help
backspace help Just need a clarification
Backspace on ruff rims 9.5 width
centerline 4.75
offset 45mm
lip width 3"
4.75+0.45+3=8.2 backspace
Does this sound right? Just want to make sure because I'll be looking for a 12 bolt and want everything to line up. Thanks
Backspace on ruff rims 9.5 width
centerline 4.75
offset 45mm
lip width 3"
4.75+0.45+3=8.2 backspace
Does this sound right? Just want to make sure because I'll be looking for a 12 bolt and want everything to line up. Thanks
Your math is a little off....
Total width of the rim is roughly 10.5", as you include the beads;
Offset of 45mm = 1.77"
So, you take half the rim width, 5.25", add the offset, 1.77" = 7.02"
This gives you an approximate backspacing of 7"
Total width of the rim is roughly 10.5", as you include the beads;
Offset of 45mm = 1.77"
So, you take half the rim width, 5.25", add the offset, 1.77" = 7.02"
This gives you an approximate backspacing of 7"
a 12 bolt, if its like a Moser will fit stock wheels fine and you can apply the same rules with that rear as you do with a stock GM 10 bolt. IF its an old style 12 bolt from a older GM, then I can see why your doing the math.
leadfoot, you use the advertised rim width not the width from edge to edge, that's not how manufacturers measure them.
9.5" with a 45mm should sit right at the edge of your fenders.
9.5/2 = 4.75 + 45mm (1.77") = 6.52" backspace.
9.5" with a 45mm should sit right at the edge of your fenders.
9.5/2 = 4.75 + 45mm (1.77") = 6.52" backspace.
Not always.....If you don't include the additional width incurred with the beads, you might not have enough clearance on a "tight" application, and this is why some manufacturers include it.
