Offset of those running 19x11 rear wheels and 305 tires
#21
Pro
Thread Starter
Both my 19's & 20's have 8.650 backspacing the tires on my 19's were about 1/4" overhang past the rim & with -5 neg camber had about 1/8" poke.
The tires on the 20's are under 1/8" past the rim & with same camber only poke 1/16" the picture with the stick had more camber than I have now, around -9
1st picture is 19's 2nd & 3rd are 20's
Forgot to add that I have what CCW calls 2" lip, I measured the rears & were about 2-7/16" most of the 3" lip I have seen poke a lot more unless you run more camber.
The tires on the 20's are under 1/8" past the rim & with same camber only poke 1/16" the picture with the stick had more camber than I have now, around -9
1st picture is 19's 2nd & 3rd are 20's
Forgot to add that I have what CCW calls 2" lip, I measured the rears & were about 2-7/16" most of the 3" lip I have seen poke a lot more unless you run more camber.
#24
Pro
Thread Starter
#25
Drifting
Thanks FYRAMS. That's what I thought. CCW seems adamant about an offset of 58mm on the rear. All the measurements I do indicate they will stick out more than I would like. It seems lots of guys are using offsets in the 65mm range with no issues, but CCW keeps suggesting 58mm. I can't quite figure that out.
#26
Le Mans Master
Both my 19's & 20's have 8.650 backspacing the tires on my 19's were about 1/4" overhang past the rim & with -5 neg camber had about 1/8" poke.
The tires on the 20's are under 1/8" past the rim & with same camber only poke 1/16" the picture with the stick had more camber than I have now, around -9
The tires on the 20's are under 1/8" past the rim & with same camber only poke 1/16" the picture with the stick had more camber than I have now, around -9
what is -5, and -9 negative camber? that is not degrees....
-.5 degree, -.9 degree??
thanks for clarifying
#27
Pro
Thread Starter
Thanks for everyones help. I just ordered the following. I'll let you know how it all turns out. Expecting 8-12 weeks for delivery.
Wheels (CCW SP505 - Polished):
Front: 19 x 9.5 with a 54mm offset
Rear: 19 x 11 with a 62mm offset
Tires (Michelin Pilot Sport 4s):
Front: 265/30/19
Rear: 305/30/19
Wheels (CCW SP505 - Polished):
Front: 19 x 9.5 with a 54mm offset
Rear: 19 x 11 with a 62mm offset
Tires (Michelin Pilot Sport 4s):
Front: 265/30/19
Rear: 305/30/19
Last edited by testpros; 09-24-2018 at 04:05 PM.
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FYRARMS (09-24-2018)
#29
Drifting
#30
Pro
The popular offset for those exact wheel/tire sizes in the Forgestar offerings is 55mm. Mine is below. The fitment is flush. I believe CCW uses a slightly less aggressive offset, so 62mm would be a good bet. Honestly, just let CCW pick the offset. They have done a gazillion C5s.
#31
Le Mans Master
Forgestar runs a slightly different offset than other brands because they were initially having an issue with needing to grind the axle stubs to clear their center caps. By changing the offset they eliminated that problem. One thing to watch out for with trying to not stick out is that you run the risk of your tires rubbing on the inner fenderwell.
#32
Le Mans Master
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Specs for my CCW SP 16a wheels
Fronts - 19" x 9.5" with 7.30" backspacing and an offset of +52 with a 1" lip
Rears - 19: x 11" with 8.15" of backspacing and an offset of +64 with a 2" lip
Running Michelin PSS 265/30/19 fronts and 305/30/19 rears. They do not hang out.
Wheels were designed around a future big brake kit working with them.
Hope this helps. Good luck with your choice of wheels.
Fronts - 19" x 9.5" with 7.30" backspacing and an offset of +52 with a 1" lip
Rears - 19: x 11" with 8.15" of backspacing and an offset of +64 with a 2" lip
Running Michelin PSS 265/30/19 fronts and 305/30/19 rears. They do not hang out.
Wheels were designed around a future big brake kit working with them.
Hope this helps. Good luck with your choice of wheels.
#34
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#35
#37
Le Mans Master
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Here's a pic of my 19x11's, with +54 offset and BFG 295/35/19 tire. I'm guessing a 305/30 will see a small amount of "poke".
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Dark Sarcasm (01-20-2019)
#39
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edit: A 19x11 with +61-65 offset will allow a 325/30/19 tire to be fitted, with almost zero poke. A 305 tire will require from +54-56 offset, for minimal to zero poke.
Last edited by USAZR1; 12-08-2019 at 03:34 PM.