I just realized the previous owner had put the wrong size on the car.

dezau · 08-09-2014, 10:41 PM

Instead of 225/45-17, 255/40-17, he put 245/45-17, 255/45-17.
I'm buying tires soon, how would 1 inch less tire change my ride? Ride harsher? Tire Wear?

I always wondered why the car with ZSP looks lowered... Free 1 in" drop ftw & no wonder the speedo's been off by a lot... =_=

850CSi · 08-10-2014, 12:32 AM

Depending on how long that was the case, it would also mean your odo is off.

Probably not a big deal tho.

dezau · 08-10-2014, 12:40 AM

Well it's had the 1" taller tires the whole 2 years I've owned the car

Tom Droze · 08-10-2014, 02:00 AM

My car has the same situation, stock was 225/45/17 and when I bought the car it had 225/45/18, so the tire is one inch taller than stock. I was curious about the speedometer accuracy so I downloaded a GPS speedometer ap to my smart phone; at an indicated 70 MPH I'm actually going 68 MPH. I was told the speedometer in our cars are about 4 MPH fast so in my case it actually helped to improve speedometer accuracy.

08-09-2014, 10:41 PM	#1
dezau Enlisted Member 39 Rep 42 Posts Drives: C63 S Join Date: Apr 2012 Location: Space Coast, FL iTrader: (0)	I just realized the previous owner had put the wrong size on the car. Instead of 225/45-17, 255/40-17, he put 245/45-17, 255/45-17. I'm buying tires soon, how would 1 inch less tire change my ride? Ride harsher? Tire Wear? I always wondered why the car with ZSP looks lowered... Free 1 in" drop ftw & no wonder the speedo's been off by a lot... =_=
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08-10-2014, 12:32 AM	#2
850CSi 16 years and counting... 101 Rep 471 Posts Drives: '06 325i 6MT Join Date: Nov 2005 Location: Wisconsin iTrader: (2)	Depending on how long that was the case, it would also mean your odo is off. Probably not a big deal tho. __________________ E90 325i 6MT + E61 530xiT 6AT = N52B30*2
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08-10-2014, 12:40 AM	#3
dezau Enlisted Member 39 Rep 42 Posts Drives: C63 S Join Date: Apr 2012 Location: Space Coast, FL iTrader: (0)	Well it's had the 1" taller tires the whole 2 years I've owned the car
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08-10-2014, 02:00 AM	#4
Tom Droze Major 413 Rep 1,286 Posts Drives: 2012 BMW 328i (e92) Join Date: Jul 2014 Location: Scottsdale, Arizona iTrader: (0)	My car has the same situation, stock was 225/45/17 and when I bought the car it had 225/45/18, so the tire is one inch taller than stock. I was curious about the speedometer accuracy so I downloaded a GPS speedometer ap to my smart phone; at an indicated 70 MPH I'm actually going 68 MPH. I was told the speedometer in our cars are about 4 MPH fast so in my case it actually helped to improve speedometer accuracy.
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