Why no fit?

vrracing · 12-27-2013, 02:10 PM

It's 90 S5 vert.

Ted, I did a couple of searches on how wheels are measured and both DiscountTire and Gemplers says its from bead seat to bead seat. That makes sense to me as the bead seat is the interface to the tire. So assuming the rim/flange is 1/2" a 9.5" wheel will have a total width of 10.5".

Of course that realization totally negates my calculations in that previous post.

Here are some shots of the front wheel measurements. My wife doesnt wait for the iPhone to focus and she wears weird socks.

TOTAL WIDTH

BEAD WIDTH

HUB TO INSIDE EDGE

And the rear

TOTAL WHEEL WIDTH

BEAD WIDTH

HUB TO INSIDE EDGE

vrracing · 12-27-2013, 02:20 PM

Re-doing the math...

Doing the math:

Fronts:

8" wheel with a total width of 9" = 228mm
half of 228 = 114mm
40mm offset means
74mm to outside of wheel
154mm to inside of wheel

measured distance from hubface to outside of fender = 64mm
measured distance from hubface to suspension = 170mm

So our 40mm offset 8" wheel should extend 10mm beyond the outside of fender and have 16mm of clearance on inside.

Rears:

9.5" wheel or 10.5 total width = 266mm
half of 266 = 133mm
if we switch from a 20 to 40 offset...
93mm to outside of wheel
173mm to inside of wheel

measured distance from hubface to outside of fender = 90mm
measured distance from hubface to trailing arm = 170mm

leaving 3mm jutting out beyond the fender and smashing into the trailing arm 3mm

RETed · 12-27-2013, 02:32 PM

Quote:

Originally Posted by vrracing

HUB TO INSIDE EDGE

Okay, this is backspacing...
...and this is for the fronts, 8.0", +40?
That looks like right around 6.0" on the tape measure...

The wheel widths are correct...

-Ted

12-27-2013, 02:10 PM	#1
vrracing Rotating Assembly Join Date: Oct 2008 Location: TX Posts: 102 Rep Power: 17	It's 90 S5 vert. Ted, I did a couple of searches on how wheels are measured and both DiscountTire and Gemplers says its from bead seat to bead seat. That makes sense to me as the bead seat is the interface to the tire. So assuming the rim/flange is 1/2" a 9.5" wheel will have a total width of 10.5". Of course that realization totally negates my calculations in that previous post. Here are some shots of the front wheel measurements. My wife doesnt wait for the iPhone to focus and she wears weird socks. TOTAL WIDTH BEAD WIDTH HUB TO INSIDE EDGE And the rear TOTAL WHEEL WIDTH BEAD WIDTH HUB TO INSIDE EDGE __________________ 90 S5 Vert. JDM Tii with BNR Stage1 turbo. Pineapple Racing street port. Bonez cat-forward. Corksport cat-back with Vibrant UltraQuiet resonator. RTek 2 wZeitronix w/b. HKS EBC. Vis CF Tii hood. 3000GT wing. Ground Control coilover kit with KYB AGX shocks. Red and Black leather RX8 seats. Corksport Odura lip & bumper caps, OEM Tii skirts

12-27-2013, 02:20 PM	#2
vrracing Rotating Assembly Join Date: Oct 2008 Location: TX Posts: 102 Rep Power: 17	Re-doing the math... Doing the math: Fronts: 8" wheel with a total width of 9" = 228mm half of 228 = 114mm 40mm offset means 74mm to outside of wheel 154mm to inside of wheel measured distance from hubface to outside of fender = 64mm measured distance from hubface to suspension = 170mm So our 40mm offset 8" wheel should extend 10mm beyond the outside of fender and have 16mm of clearance on inside. Rears: 9.5" wheel or 10.5 total width = 266mm half of 266 = 133mm if we switch from a 20 to 40 offset... 93mm to outside of wheel 173mm to inside of wheel measured distance from hubface to outside of fender = 90mm measured distance from hubface to trailing arm = 170mm leaving 3mm jutting out beyond the fender and smashing into the trailing arm 3mm __________________ 90 S5 Vert. JDM Tii with BNR Stage1 turbo. Pineapple Racing street port. Bonez cat-forward. Corksport cat-back with Vibrant UltraQuiet resonator. RTek 2 wZeitronix w/b. HKS EBC. Vis CF Tii hood. 3000GT wing. Ground Control coilover kit with KYB AGX shocks. Red and Black leather RX8 seats. Corksport Odura lip & bumper caps, OEM Tii skirts