Chris Wilson Posted May 16, 2011 Share Posted May 16, 2011 A chap has tried to measure some rims to check the offset, but I diasgree with his figures. Based on his e-mail, what do you guys get the figure to? Thanks ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ according to https://www.rsracing.com/tech-wheel.html#backspace and given that the width of the wheels is 9.5j and the back space = 5.5 inches that means offset = 6 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Quote Link to comment Share on other sites More sharing options...
dandan Posted May 16, 2011 Share Posted May 16, 2011 (edited) If the wheel width is 9.5 in between the beads (i.e. an actual 9.5" wheel) and he measure the 5.5" from the furthest inward point of the wheel to the hub face I get 6mm too because a 9.5" wheel will actually measure 10.5" total width. So the centreline for zero offset is 5.25" in from the edge of the wheel. If he's measuring 5.5" then that's as good as 6mm offset. If it's an 8.5" wheel (measuring 9.5" total) then I make it 19mm. Edited May 16, 2011 by dandan (see edit history) Quote Link to comment Share on other sites More sharing options...
JamieP Posted May 16, 2011 Share Posted May 16, 2011 half of 9.5 = 4.75. take the 4.75 off the 5.5 back space leaves 0.75 so the offset works out +19mm? Quote Link to comment Share on other sites More sharing options...
DaveR Posted May 16, 2011 Share Posted May 16, 2011 half of 9.5 = 4.75. take the 4.75 off the 5.5 back space leaves 0.75 so the offset works out +19mm? Yeah, that...! Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted May 16, 2011 Author Share Posted May 16, 2011 I was getting +19 mm too. He has taken months to get round to measuring them, and much prodding, I don't think I can bear any more If the rims were nearer I'd go and see for myself, but he is in London somewhere. Cheers. Quote Link to comment Share on other sites More sharing options...
JamieP Posted May 16, 2011 Share Posted May 16, 2011 Dan is right, i forgot you measure the inside of the wheel, at 10.5" overall its +6 offset. Quote Link to comment Share on other sites More sharing options...
garethr Posted May 17, 2011 Share Posted May 17, 2011 To be sure... Place the wheel face down on a flat surface. Put a straightedge across the top. Measure the distance from the straightedge to the flat surface in mm. Measure the distance from the straightedge to the mounting face in mm. If he can't manage that, then there is no hope. Quote Link to comment Share on other sites More sharing options...
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