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14 September 2010 #1
- Join Date
- 14 Aug 2010
- Location
- Chicago
- Posts
- 33
- Saab(s)
- 03' 9-3 SS Linear--gone, 06' 9-3 SC Aero--gone, 09' 9-3 SS Aero Auto--yeah
Why The Different Tire Sizes on Aero XWD?
I still can't figure our why they went with the sizes used. Why didn't they just use the 235/45/17 vs. the 225/50/17 "H" rated tire, not V or Z?
And the optional tire, 235/45/18, I don't think is the same diameter as the 225/50/17 so how do they get away with that?
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14 September 2010 #2
Frank Administrator
- Join Date
- 30 Jul 2010
- Location
- USA - Netherlands
- Posts
- 7,901
- Saab(s)
- previous: 2006 9-3, 2001-06 9-5, 2011 9-4X
Did your car came with the 225/50/17 tires? The Saab USA website listed P235/50R17-98V for the 2.0T XWD and Aero XWD as standard sizes. And the optional P235/45R18-98Y have the same diameter as the stock tires.
2009 USA specs here:
http://saabworld.net/showthread.php/...ifications-USA
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14 September 2010 #3
- Join Date
- 14 Aug 2010
- Location
- Chicago
- Posts
- 33
- Saab(s)
- 03' 9-3 SS Linear--gone, 06' 9-3 SC Aero--gone, 09' 9-3 SS Aero Auto--yeah
That must be a mistake.
The standard tire for the 09' Aero is 225/50/17 and optional is the 235/45/18. In 08', when XWD was optional and the 255 hp. was standard, it came with the 235/45/17. I believe the 10' XWD as well come with the 225/50/17. The Turbo X 18" wheels and 235/45/18 are optional on all models it appears.
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01 November 2010 #4
you can see the tire equivalences on this page: Tire Size calculator, table
225/50R17 is for more comfort in ride.
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18 December 2010 #5
in my Aero I have tires 235/45/17 94W and I am thinking to replace with 225/50/17 94W for more drive comfort but not sure yet.
for the ITV must fulfill the following steps:
- Load Rate the same or more.
- outside diameter with a tolerance of + / - 3 percent.
- Code of speed rating or above. (In the case of M + S tires allowed a lower level).
- The profile is the mounting rim for the tire.
odometer must be calibrated for a wheel with Diameter total :657 mm. (+2.06 %)?
some other software factors may be involved in malfunction like MPG, fuel gauge meter, ABS, TCS, .....the wheel sensor read 15 pulses per lap in a specified distance. if this distance in a lap is more then the odometer must be calibrated otherwise...........?Last edited by jlrSAAB; 18 December 2010 at 21:55.
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