My 5-Lug plans (um, back to 4-lug!)

Topic: My 5-Lug plans (um, back to 4-lug!) (Read 10409 times) previous topic - next topic

My 5-Lug plans (um, back to 4-lug!)

Reply #60 – November 19, 2007, 11:18:30 PM

Stock

14x5.5s have a +1.12" offset (27.4mm) BS=4.37" FS=2.13"
15x7.0s have a +0.88" offset (22.4mm) BS=4.88" FS=3.12"

17x8.0s have a +1.18" offset (30.0mm) BS=5.68" FS=3.32"
17x9.0s have a +0.98" offset (25.0mm) BS=5.98" FS=4.02"

This is assuming the wheel is actually 1" wider than the advertised width.
Factory offsets come from my '85 Helm manual.

In my current case (described earlier), going to 9" wheels would push it out .7" (4.02-3.32)=.7

My 5-Lug plans (um, back to 4-lug!)

Reply #61 – November 19, 2007, 11:29:03 PM

Yeah, that's about right. Turbines have a 4.95" backspace (verified just last week) which is about 24mm offset assuming an 8" wide lip to lip wheel - I just round off to 5". The new wheels have a 6" backspace and 25mm offset so I expected the rim lip to be 1" farthur out. It's close enough for horseshoes and hand grenades. All I care about is that the center point is approximately the same. They fit perfectly as a rim lip 1/4" from the strut is about as close as you want to go! I suppose I could have a bit more as I always push the top of the spindle in as far as possible before tightening up the strut bolts (for obvious reasons). Everything is on target as far as tread edge location WRT the fender lip - like I said, the actual dirty part of the tread is slightly more inboard with these new tires/rims.

And yes, you having the 30mm offset are in good shape so long as you can resist upgrading :D

My 5-Lug plans (um, back to 4-lug!)

Reply #62 – November 20, 2007, 11:56:14 AM

I assume that camber is adjusted (sans C-C plate) by drilling out the rivet and loosening the three bolts, then prying with a piece of wood to move the plate? There's no reason to lift the car or remove the wheel right? I am going to do the camber thing as I liked when I had a lot of negative camber previously (must have been worn ball-joints as it went away when I installed the 2k03 Cobra arms.) I may look at the lip after that. If that doesn't do it, I am considering the 235/45/17's to help shrink down the tire a bit. Thanks for all the suggestions people - it's nice not to have to suffer all alone :hick:

My 5-Lug plans (um, back to 4-lug!)

Reply #63 – November 21, 2007, 11:14:30 AM

Darn, I already have 1 deg of negative camber as it sits :(

I can swap these out for 235/45/17 which are 0.2" narrower and 25.3" tall vs. 25.7" tall or...

245/40/17 which is 1" shorter - 24.6" versus 25.7"

...or I could add a 1/4" spacer under the spring (get me 1/2" height) & mess with the lip (I don't see much to gain here with the inner fender there.)

Any opinions here?

My 5-Lug plans (um, back to 4-lug!)

Reply #64 – November 21, 2007, 03:22:48 PM

...as I continue the conversation with myself, I ordered the 1/4" spring spacers today. I figured instead of making the sidewalls shorter, I'd just raise the fender the same amount (1/2"). Can't wait to install the spacer on the drivers side and go for a ride!

My 5-Lug plans (um, back to 4-lug!)

Reply #65 – November 21, 2007, 04:34:10 PM

In the back, I have long studs for the stupid Weld wheels. Do these long lugs look good or stupid? They stick out the same distance as the hub cap.

My 5-Lug plans (um, back to 4-lug!)

Reply #66 – November 21, 2007, 04:36:16 PM

Looks fine to me?

My 5-Lug plans (um, back to 4-lug!)

Reply #67 – November 21, 2007, 08:58:46 PM

Not to hi-jack your thread (you're doing a kick ass job btw:D ) but since you've done some research on this I'll ask ya. Do you think these would fit my T-bird: http://www.fordracingparts.com/parts/part_details.asp?PartKeyField=5088 without having them hit the fender or having to roll the lip? They are 17x8 wheels. Also any idea as to what tire to run? Thanks and sorry again for the hi-jack :hick:

My 5-Lug plans (um, back to 4-lug!)

Reply #68 – November 22, 2007, 12:25:07 AM

Quote from: thunderjet302;189019

Not to hi-jack your thread (you're doing a kick ass job btw:D ) but since you've done some research on this I'll ask ya. Do you think these would fit my T-bird: http://www.fordracingparts.com/parts/part_details.asp?PartKeyField=5088 without having them hit the fender or having to roll the lip? They are 17x8 wheels. Also any idea as to what tire to run? Thanks and sorry again for the hi-jack :hick:

Well, I'm going to defaut to Jeremy's comments as he has 8" wheels in the front.

Quote from: JeremyB

My '87, with 17x8 +30mm offset wheels and 225/45/17 tires is at the ragged edge of rubbing. (-5/8 degree camber)

also...

Stock

14x5.5s have a +1.12" offset (27.4mm) BS=4.37" FS=2.13"
15x7.0s have a +0.88" offset (22.4mm) BS=4.88" FS=3.12"

17x8.0s have a +1.18" offset (30.0mm) BS=5.68" FS=3.32"
17x9.0s have a +0.98" offset (25.0mm) BS=5.98" FS=4.02"

With only 15mm offset, you are pushing the tread about 7-10mm or ~0.3 - 0.4" toward the fender lip This could easily get you into trouble if you use a wide tire &/or the car is lowered. This calculator is a fun way to compare tire sizes on old versus new rims http://www.1010tires.com/TireSizeCalculator.asp?action=submit . As I am finding out, it is difficult to find a narrow enough tire when you grow the diameter and width of the rim - the choices are few. Also read both pages here http://www.carbibles.com/tyre_bible.html though some of the info is tailored to FWD european cars. Some good info here on how much the section width will change from the "measuring rim" that the tires advertised width is based on compared to the actual rim width you are using http://www.tirerack.com/tires/tiretech/tirespecskey.jsp . As far as which tire to run? You can compare tires on the 1010 site above. Also, the "tyre bible" will let you compare tires & shows how the new tires fits compared to the old tire (side view). Good luck!

Edit: oh, and do a few searches here: http://www.corral.net/forums/forumdisplay.php?f=307 - huge volume of people pass through there who have tried all sorts of wheel/tire combinations.

My 5-Lug plans (um, back to 4-lug!)

Reply #69 – November 23, 2007, 10:00:21 PM

I have some reading to do. Thanks :D