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Depends on how he used described the spacing. 3 3/4 inches is bit more than 95mm - so 5 by 3 3/4 is the same as saying 5x100 (mm). Basically, they are really close lug spacings - assuming that he measured them himself. Now if the wheel is stamped with 3 3/4" - you will have a problem, since industry usually marks them as 4" inches being equivalent to 100 mm. So if it was 5 x 4" spacing, you are OK. 5 x 3 3/4" spacing, could be a problem. There is no way that fit a standard Celica that takes a 5 x 100 wheel.
What I would be more concerned about is "offset" - how much are the wheel mounting pad (that part that touches your hub) is offset from the center of the wheel. As well as bore centers (how big around the center hole is in the wheel). If they came off a Celica (I'm assuming 7th generation??) - you should be OK, but doesn't hurt to check them out.
EDIT - I'll bet he meant 3 3/4" backspace - how far the face of the wheel mounting pad is from the back edge of the wheel. That measurement is basically 1/2 the width of the wheel + offset. A 3 3/4" backspace would be appropriate for 7.5" wide wheel with 0 offset or a 7" wide wheel with a 13mm offset. Make sure before your buy - that will not work for the Matrix.
For a 2003-2008 Matrix - for factory like fitment (i.e., no clearance issues, speedo will be correct, etc.):
16" wheel - 5 x 100 lug pattern, 16" x 6.5" wheel (diameter x width), 39mm backspace, 205/55-16 tire
17" wheel - 5 x 100 lug pattern, 17" x 7" wheel (diameter x width), 45mm backspace, 215/50-17 tire
centerbore is 54mm? I can't remember offhand.
If you need more detail and diagrams - hit the Tirerack website and look for their tech articles, a ton of information there.
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2002 Corolla S, 1.8L 1ZZ-FE VVT-i
2003 Matrix XRS, 1.8L 2ZZ-GE, VVTL-i (RIP)
2009 Matrix XRS, 2.4L 2AZ-FE VVT-i
Last edited by fishexpo101; 09-30-2009 at 05:02 PM.
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