Wheel Offset
Le Mans Master
Joined: Aug 2015
Posts: 6,086
Likes: 1,972
From: St. Charles MO
To end the suspense, the direct answer to your question is that both of the offsets being recommended will be fine on your car.
The 18x10.5 et56 will fit. It gives you 7.95" of backspacing, and it will fit just fine on a C4, front or rear. You might prefer the look with a bit less offset or a 1/4" spacer to set it out just a bit further, but either way will fit well. For reference, the 11" et50 fitment that Kevova mentions gives backspacing of 7.96". It also fits fine on the front or rear. It would add the entire extra 1/2" of width to the outside edge.
The factory offset for 9.5" wheels was 56mm. You have plenty of space to play with different offsets at that width. 54mm is close to the stock offset, and it's probably the most offset you'll ever want at that width. But you could try less offset or up to a 1/2" spacer if you wanted to play around to find the best look.
The 18x10.5 et56 will fit. It gives you 7.95" of backspacing, and it will fit just fine on a C4, front or rear. You might prefer the look with a bit less offset or a 1/4" spacer to set it out just a bit further, but either way will fit well. For reference, the 11" et50 fitment that Kevova mentions gives backspacing of 7.96". It also fits fine on the front or rear. It would add the entire extra 1/2" of width to the outside edge.
The factory offset for 9.5" wheels was 56mm. You have plenty of space to play with different offsets at that width. 54mm is close to the stock offset, and it's probably the most offset you'll ever want at that width. But you could try less offset or up to a 1/2" spacer if you wanted to play around to find the best look.
Last edited by MatthewMiller; Mar 13, 2019 at 10:16 AM.
Team Owner
Joined: Sep 2003
Posts: 25,365
Likes: 2,731
To end the suspense, the direct answer to your question is that both of the offsets being recommended will be fine on your car.
The 18x10.5 et54 will fit. It gives you 7.95" of backspacing, and it will fit just fine on a C4, front or rear. You might prefer the look with a bit less offset or a 1/4" spacer to set it out just a bit further, but either way will fit well. For reference, the 11" et50 fitment that Kevova mentions gives backspacing of 7.96". It also fits fine on the front or rear. It would add the entire extra 1/2" of width to the outside edge.
The factory offset for 9.5" wheels was 56mm. You have plenty of space to play with different offsets at that width. I wouldn't use any more offset than 56mm, but you could try less offset or up to a 1/2" spacer if you wanted to play around to find the best look.
The 18x10.5 et54 will fit. It gives you 7.95" of backspacing, and it will fit just fine on a C4, front or rear. You might prefer the look with a bit less offset or a 1/4" spacer to set it out just a bit further, but either way will fit well. For reference, the 11" et50 fitment that Kevova mentions gives backspacing of 7.96". It also fits fine on the front or rear. It would add the entire extra 1/2" of width to the outside edge.
The factory offset for 9.5" wheels was 56mm. You have plenty of space to play with different offsets at that width. I wouldn't use any more offset than 56mm, but you could try less offset or up to a 1/2" spacer if you wanted to play around to find the best look.
***11 @ 50 and 10.5 @ 56 would be identical I believe for back-spacing and so long as the OP has no issues with inner clearance outer rim edge is very close to maybe original.
Last edited by WVZR-1; Mar 13, 2019 at 10:06 AM.
Le Mans Master
Joined: Aug 2015
Posts: 6,086
Likes: 1,972
From: St. Charles MO
Conversation regarding spacers etc ain't actually relevant for the OP. I believe the OP mentions 10.5 @ 56 and the 9.5 @ 54. Neither 'if factual' are issues for the OP and the OP has a newer than '88 C4!
***11 @ 50 and 10.5 @ 56 would be identical I believe for back-spacing and so long as the OP has no issues with inner clearance outer rim edge is very close to maybe original.
***11 @ 50 and 10.5 @ 56 would be identical I believe for back-spacing and so long as the OP has no issues with inner clearance outer rim edge is very close to maybe original.
To the OP, I forgot to mention this, but have you considered running the 10.5 et56 both front and rear? That would fit well up front, too, and gives you the option of running a 285/35 or 295/35 tire at all four corners.
Last edited by MatthewMiller; Mar 13, 2019 at 10:19 AM.
