4-C. Four C Active suspension. Critical tyre sizing?

Lancee · Aug 2nd, 2014, 14:34

How critical is the tyre sizing on a car with the 4-C active suspension?

Car is running (as purchased) on 235/45/R18 tyres at the moment, I see the recommended size is 235/40/R18.

Only a 23.5 mm difference in overall diameter but enough to cause issues?

Showing DTC's; SUM 0220 Position sensor, calibration not completed and,
SUM 0222 Solenoid, calibration not completed.

Car is at Volvo main dealer on Monday for a SUM re-calibration.

Dtp · Aug 2nd, 2014, 15:37

I think the calibration on Monday should clear the code. I have 235 x 40 x 18 for my road tyres. I use team dynamics 235 x 40 x 17 for track use as the tyres are cheaper and get no codes using these wheel/tyre combination

harveys · Aug 2nd, 2014, 15:59

The 4-C and AWD is where tyre size matters,to the car that is. Along at all 4 are the same shouldn't be a problem.

But the insurance company could have different idear for the wrong Size tires fitted,if it's not factory standard size then it's a modification.

Aug 2nd, 2014, 14:34	#1
Lancee Premier Member Last Online: Today 23:38 Join Date: Jun 2009 Location: Devon	4-C. Four C Active suspension. Critical tyre sizing? How critical is the tyre sizing on a car with the 4-C active suspension? Car is running (as purchased) on 235/45/R18 tyres at the moment, I see the recommended size is 235/40/R18. Only a 23.5 mm difference in overall diameter but enough to cause issues? Showing DTC's; SUM 0220 Position sensor, calibration not completed and, SUM 0222 Solenoid, calibration not completed. Car is at Volvo main dealer on Monday for a SUM re-calibration. Last edited by Lancee; Aug 2nd, 2014 at 14:36.

Aug 2nd, 2014, 15:37	#2
Dtp Member Last Online: Apr 5th, 2015 19:49 Join Date: Apr 2012 Location: Malvern	I think the calibration on Monday should clear the code. I have 235 x 40 x 18 for my road tyres. I use team dynamics 235 x 40 x 17 for track use as the tyres are cheaper and get no codes using these wheel/tyre combination

Aug 2nd, 2014, 15:59	#3
harveys Master Member Last Online: Feb 10th, 2022 22:33 Join Date: Jul 2007 Location: newton abbot in sunny Devon	The 4-C and AWD is where tyre size matters,to the car that is. Along at all 4 are the same shouldn't be a problem. But the insurance company could have different idear for the wrong Size tires fitted,if it's not factory standard size then it's a modification.

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