C5 wheels on C4 ?
Thread Starter
Heel & Toe
Joined: Feb 2003
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From: Felton DE
C5 wheels on C4 ?
What are the pros and cons to putting the 17" front 18" rear combo on C4s? Do you have to flash the prom to recalibrate the speedo for the size change in rear? Thanks
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Re: C5 wheels on C4 ? (95sport)
:cheers:
Not sure of any Pro's or Cons. Yes if you are going from 17 to 18" rear wheels you will have to recalibrate speedo
:steering:
Not sure of any Pro's or Cons. Yes if you are going from 17 to 18" rear wheels you will have to recalibrate speedo
:steering:
Elite Torch Red Member
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From: Exit 89 GSP,Lakewood,NJ The Land Of Mojo
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Re: C5 wheels on C4 ? (jackdaroofer)
:cheers:
Not sure of any Pro's or Cons. Yes if you are going from 17 to 18" rear wheels you will have to recalibrate speedo
:steering:
Not sure of any Pro's or Cons. Yes if you are going from 17 to 18" rear wheels you will have to recalibrate speedo
:steering:
Instructor
Joined: Jan 2003
Posts: 110
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From: Cleveland Ohio
Re: C5 wheels on C4 ? (95sport)
It depends on the installed height of your wheel tire combo - I lost 2/10th of an inch going to 18" wheels (275/40-17 vs. 275/35-18) - so for me, it wasn't that big of a deal. The Tire Rack at http://www.tirerack.com has all of the specs on the various brands of tires in terms of height, recommended rim width, etc.
I went with 275/35-18, but 285 or 295 18’s might be a closer fit depending on which size 17’s you’re running.
I went with 275/35-18, but 285 or 295 18’s might be a closer fit depending on which size 17’s you’re running.
Thread Starter
Heel & Toe
Joined: Feb 2003
Posts: 24
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From: Felton DE
Re: C5 wheels on C4 ? (johnboy89)
Thanks everyone! I'm new to the forum and am amazed at the wealth of knowledge and experience in here, and how willing everyone is to help. Thanks. :)
Le Mans Master
Joined: Apr 2000
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From: Shelton CT
Re: C5 wheels on C4 ? (95sport)
Thanks everyone! I'm new to the forum and am amazed at the wealth of knowledge and experience in here, and how willing everyone is to help. Thanks. :)
Team Owner
Joined: May 1999
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From: Columbus Ohio
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Re: C5 wheels on C4 ? (Mr Mojo)
:cheers:
Not sure of any Pro's or Cons. Yes if you are going from 17 to 18" rear wheels you will have to recalibrate speedo
:steering:
Only if the tire diameter is different. Do some measuring.
Not sure of any Pro's or Cons. Yes if you are going from 17 to 18" rear wheels you will have to recalibrate speedo
:steering:
Only if the tire diameter is different. Do some measuring.
Like Mojo said your goal is to keep the same overall diameter. :yesnod:
[Modified by Blue 92, 12:51 PM 4/13/2003]
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Instructor
Joined: Jan 2003
Posts: 110
Likes: 0
From: Cleveland Ohio
Re: C5 wheels on C4 ? (Blue 92)
Not all tyres of identical size are actually the same dia. (or tread width for that matter) - actual size does and tread width does vary somewhat from manufacturer to manufacturer. Point being, check the manufacturers specs closely for the most accurate info when comparing tyres.
Drifting
Joined: Jul 2002
Posts: 1,705
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From: OKC Oklahoma
Re: C5 wheels on C4 ? (Mr Mojo)
:cheers:
Not sure of any Pro's or Cons. Yes if you are going from 17 to 18" rear wheels you will have to recalibrate speedo
:steering:
Only if the tire diameter is different. Do some measuring.
Not sure of any Pro's or Cons. Yes if you are going from 17 to 18" rear wheels you will have to recalibrate speedo
:steering:
Only if the tire diameter is different. Do some measuring.
Burning Brakes
Joined: Jun 2002
Posts: 908
Likes: 0
From: Waipahu Hawaii
Re: C5 wheels on C4 ? (95sport)
What are the pros and cons to putting the 17" front 18" rear combo on C4s? Do you have to flash the prom to recalibrate the speedo for the size change in rear? Thanks
[Modified by Hawaiian Punch, 5:16 PM 4/15/2003]
Drifting
Joined: Jul 2002
Posts: 1,705
Likes: 5
From: OKC Oklahoma
Re: C5 wheels on C4 ? (Hawaiian Punch)
con's....speed-o will read about 5 miles off with stock size tires that comes on the 18 inch C-5 rear rim's. :thumbs:
Instructor
Joined: Jan 2003
Posts: 110
Likes: 0
From: Cleveland Ohio
Re: C5 wheels on C4 ? (_freakmonkeydogboy_)
If you get 285/35-18’s, they are a ‘perfect’ match (for 275/40-17's)- I bought 275's 'cause the tires I wanted weren't available in 285's at the time from my dealer - plus I saved some money.
I gave up only 2/10ths of an inch in height (i.e., Dia.) - which means my car sits lower by only 1/10th inch (1/10th of an inch less rubber appearing in the wheel well).
Kumho Specs
275/40-17: 25.7” dia
285/35-18: 25.7” dia.
My tires (275/35-18) are 25.5" in Dia.
I gave up only 2/10ths of an inch in height (i.e., Dia.) - which means my car sits lower by only 1/10th inch (1/10th of an inch less rubber appearing in the wheel well).
Kumho Specs
275/40-17: 25.7” dia
285/35-18: 25.7” dia.
My tires (275/35-18) are 25.5" in Dia.
Burning Brakes
Joined: Jun 2002
Posts: 908
Likes: 0
From: Waipahu Hawaii
Re: C5 wheels on C4 ? (_freakmonkeydogboy_)
con's....speed-o will read about 5 miles off with stock size tires that comes on the 18 inch C-5 rear rim's. :thumbs:which is why you should get 35 series tires on the rear instead of 40 series, then you won't be off but maybe 1 mph, which is practically neglegible :D
When the car is lowerd, you dont get much of a change in the ride, untill it reaches a curtain point, which is the point that I'm presently at right now.
You are 100% right though about the speed being only a mile or 2 off. Mahalo and Aloha. :thumbs:
[Modified by Hawaiian Punch, 5:18 PM 4/15/2003]
Pro
Joined: May 2001
Posts: 717
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From: Springdale PA
Re: C5 wheels on C4 ? (95sport)
Thanks everyone! I'm new to the forum and am amazed at the wealth of knowledge and experience in here, and how willing everyone is to help. Thanks. :)
Instructor
Joined: Mar 2003
Posts: 176
Likes: 0
From: Holtsville NY
Re: C5 wheels on C4 ? (95sport)
Maybe I'm just silly but when you talk about tires and fractions of an inch I just can't see a giant difference. Wouldn't a new tire and a well worn tire be different in diameter as well as the difference between a properly inflated tire and an underinflated tire. :confused:
Instructor
Joined: Jan 2003
Posts: 110
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From: Cleveland Ohio
Re: C5 wheels on C4 ? (Epyon127)
...also, if your tires are of a smaller diameter, as are mine, it takes you longer to get where you are going - so you are always having to leave a little earlier than you normally would, which is what I have to do now - after awhile it gets to be a real pain.
I think it has something to do with that space-time continuum thing, but I’m not sure.
I think it has something to do with that space-time continuum thing, but I’m not sure.
