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mark '87 930's Avatar
Join Date: Feb 2006
Location: Toronto, Ontario
Posts: 727
Stock 9X16 rear wheels, what are you guys running? speedo is now off.

I just got a new set of rears 245/45 , I previously had 245/50's on there, so the lower profile is a smaller tire altogether.

My speedometer is no longer accurate which I was expecting. It's about 10% off now.

I know the 245/45 is the stock tire size, but I'm just curious if you guys runs something else. Maybe the PO had the speedo calibrated to the larger tire size?
1987 930
1956 Chevy 3100
2009 Subaru Forester
2003 KX250 X2(I like my toys!!)
Old 06-26-2007, 05:13 AM
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wcc wcc is offline
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Join Date: Aug 2005
Location: Michigan
Posts: 3,334
Mine has the 245/45 stock size and the speedometer is off anyways. It always reads faster then what I'm actually going. For example, I passed one of the radar speed signs and it was about 5mph slower then what my speedometer said. So by going to a smaller size would make it off even more.
Old 06-26-2007, 06:30 AM
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Join Date: Feb 2004
Location: South Bay Area, CA
Posts: 348
Ditto here - I'm running SO3 245/45x16's and my speedo reads about 10% faster than my GPFS says I'm actually travelling.

'87 930
'73 911T
Old 06-26-2007, 09:03 AM
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