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math and custom offset on wheels

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Old Apr 8, 2019 | 10:40 PM
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Default math and custom offset on wheels

this is for my 99 c5 trying to see if i have the right offset. i do have the TPE front and rears fenders. i also have upgrade calipers,rotors and hats below is my measurement i made on my own. the biggest issue is going to be the hats on the rotors. front are 1 3/8 thick rears are 3/8 thick (i do have extended studs frt and rears) on the bottom of each pics (PDF file) and my hats thickness and below is the stock thickness.
front wheel offset +45
rears wheel offset +57
front brakes setup dont have a pic for the rears


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File Type: pdf
rotors.pdf (242.8 KB, 119 views)
File Type: pdf
Scan_0001.pdf (243.8 KB, 91 views)

Last edited by ri-vette; Apr 8, 2019 at 10:44 PM.
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Old Apr 9, 2019 | 02:12 AM
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What wheel widths? Are the fronts fenders +1 and rears +2?
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Old Apr 9, 2019 | 06:01 AM
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Originally Posted by USAZR1
What wheel widths? Are the fronts fenders +1 and rears +2?
i have tpe rears and forgedstar f14 wheels. The rears are 19x12..with a 24mm offset.. they stick out maybe a 1/2 inch but barely noticeable..hope this helps..
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Old Apr 9, 2019 | 06:04 AM
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Sorry meant for ri-vette!
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Old Apr 10, 2019 | 07:22 AM
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Originally Posted by USAZR1
What wheel widths? Are the fronts fenders +1 and rears +2?
tpe are 2 in rears and 1 1/8 front. remember the problem is my custom hats on my rotors acting like a wheels spacer.
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Old Apr 10, 2019 | 03:44 PM
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Originally Posted by ri-vette
remember the problem is my custom hats on my rotors acting like a wheels spacer.
And, you never answered my question about wheel sizes. How much thicker are the rotor hats? Are those C5 rotors? Have you tried to fit any wheels, yet?
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Old Apr 11, 2019 | 07:57 AM
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Originally Posted by USAZR1
And, you never answered my question about wheel sizes. How much thicker are the rotor hats? Are those C5 rotors? Have you tried to fit any wheels, yet?
they are on the PDF file on first thread. all the brake sizing
front rotors thick is 1 3/8 stock rotors hat is 19/64
rear rotors hats are 63/64 stocks are 1/4
ive been told i have wildwood calipers and pads and coleman rotors and unknown hats

i bought the vehicle with the brake upgrade. they are a c5 lug bolt pattern (i matched up a stock front and rear hub Assembly from the parts store) with extended studs
im looking to fit 19" wheels front 11" wide and rears 13" wide
i already purchased 285/30/19 tires up front.

they only wheels i have are aftermarket wheels. weld wheels and the front poked out. i have not tired to fit stock wheels on.

thank you

Last edited by ri-vette; Apr 11, 2019 at 08:00 AM.
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Old Apr 11, 2019 | 07:46 PM
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19x11” with a +44 offset is 7.75” of backspacing fronts.
19x13” with a +41 offset is 8.65” of backspacing rears.
does this sound right??
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Old Apr 11, 2019 | 08:17 PM
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Originally Posted by ri-vette
19x11” with a +44 offset is 7.75” of backspacing fronts.
19x13” with a +41 offset is 8.65” of backspacing rears.
does this sound right??
Are these wheels you have, now, or just what you want to buy? If it's the latter, what is the offset on your 11" fronts that have too much poke? I assume they cleared your front brakes ok but just didn't have enough offset. Do you have a photo, with those wheels on the car?
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Old Apr 12, 2019 | 12:18 AM
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Originally Posted by USAZR1
Are these wheels you have, now, or just what you want to buy? If it's the latter, what is the offset on your 11" fronts that have too much poke? I assume they cleared your front brakes ok but just didn't have enough offset. Do you have a photo, with those wheels on the car?
those size are for the new wheels to fit my wide body. i contacted CCW. they gave me their numbers what my set up should be.
my back spacing is front 7 5/16" rears 8 3/8 these are weld wheels that are on my vehicle now.
my front wheels always poked out like a 1/2. i have 18" wheels idk about the width. also the fronts are very very close to hitting caliper and the spokes


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Old Apr 12, 2019 | 12:44 AM
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Those calipers look like nothing I've ever seen and those hats, too. If it were my car, I would install brakes that I absolutely knew were for that car. It would greatly simplify things and probably cost you less, in the long run.
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