Dealer install wrong tire size?
04-24-2009, 07:42 PM
#11
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might be my 2nd scotch that's doing it! :-)
here we go - I know car is staggered F/R. let's forget the fronts, period. I replaced the 2 rear tires. the replacements are NOT the same size as the original REAR tires. they should be 275/30/19. they put on 285/35/19.
My paperwork has a few lines regarding tires. 1 line says : "mount and balanced 2 Continental 275-30-19 Tires on the rear..."
2nd line says : "Replace 2 rear tires p check force variation and balance / / CONTISPORTCONTACT2 P285/35R19X - See
Arnie"
the actual part # shows 285/35R19 99Z
Sooooo, my guess is they couldn't get the right size, and assumed the slightly larger tire would be fine. I don't really believe this, because I have full faith and trust in my dealer (known them a very long time). could just be a tech confusion. who knows, but I'll go tomorrow and deal with it.
here we go - I know car is staggered F/R. let's forget the fronts, period. I replaced the 2 rear tires. the replacements are NOT the same size as the original REAR tires. they should be 275/30/19. they put on 285/35/19.
My paperwork has a few lines regarding tires. 1 line says : "mount and balanced 2 Continental 275-30-19 Tires on the rear..."
2nd line says : "Replace 2 rear tires p check force variation and balance / / CONTISPORTCONTACT2 P285/35R19X - See
Arnie"
the actual part # shows 285/35R19 99Z
Sooooo, my guess is they couldn't get the right size, and assumed the slightly larger tire would be fine. I don't really believe this, because I have full faith and trust in my dealer (known them a very long time). could just be a tech confusion. who knows, but I'll go tomorrow and deal with it.
04-24-2009, 08:09 PM
#12
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IMHO the size difference is "significant" - about 1/2 " larger rolling radius. Aside from speedometer error this may cause onboard electronics to have a headache ... esp if they are comparing front and rear tire speeds ... might cause your stability control system to think something is slipping or out of wack!
http://www.miata.net/garage/tirecalc.html
http://www.miata.net/garage/tirecalc.html
04-24-2009, 08:18 PM
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My Ride: 2008 535xi / Platinum Grey / Black leather / Step Auto / Sport / Premium / Cold weather / 18" wheels / Logic 7 / Comfort / ipod / Navigation / Fold Down Rear Seats / Rear Airbags / Sirius SAT / Spoiler / Extended Clear bra / Bluetooth. (Previously owned a 2002 sport 525I Loaded).
On order: 535xi Platnium Grey with Black interior, Step Auto, Sports package, Premium package, Cold weather package, 18" wheels, Logic 7, Comfort access, ipod adapt, Navigation, Sat radio, Rear spoiler, Extended Clear coat bra.
Take the car back as soon as possible. Luigi524td is on the money with his explanation.
04-24-2009, 10:06 PM
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Mine are 245/35/19 and 275/30/19 CSC3 on m166's.... I think the dealer defintely screwed up by using a 285 with the other tire being 275... I'm sure the car's computer would be confused...
04-25-2009, 12:47 AM
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My Ride: F11 535i M-Sport,, Silver, Black Leather, LED Adaptive headlights
Model Year: 2015
Engine: N55
The rolling radius of your wheels has been increased from 323.8mm to 341.05 mm, so the new wheels have an increased circumference of 108.39 mm or 5.33%
This will mean that your speedo is reading too slow, when you are at an indicated 70mph you will in fact be doing 73.73mph.
In UK it is illeagl to have a speedo which reads slow, they must be either accurate or read fast, wouldn't be surprised if it was the same where you are.
This will mean that your speedo is reading too slow, when you are at an indicated 70mph you will in fact be doing 73.73mph.
In UK it is illeagl to have a speedo which reads slow, they must be either accurate or read fast, wouldn't be surprised if it was the same where you are.
04-25-2009, 05:07 AM
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Well I think it's unanimous.. you guys are definitely well respected by me, and I will be going back. called dealer today, and they only have 1 team on, so it looks like Monday. these aren't stocked tires, so we'll see.
This disappoints me, because the cushy drive was so noticeable, I immediately knew something was wrong. And yes, they do look a slight bit different (taller)..
Thanks all.
This disappoints me, because the cushy drive was so noticeable, I immediately knew something was wrong. And yes, they do look a slight bit different (taller)..
Thanks all.
04-25-2009, 12:04 PM
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My Ride: 2008 550i Jet Black on Black Leather, SAT with Paddles, Logic 7, Comfort Seats, NAV, Sport Package, PDC, Xenons, Sirius, Trinity 12W LED Angel Eyes, RPi GT Exhaust, M rear spoiler, ACS Roof Spoiler, Tinted Tail Lights, Bimmian Carbon Fiber Pillar Trim, Bimmian Shadow 550i emblem, RPi Scoop, E60 Forum Cling, Mtec bulbs in fog lights, Mtec 2W LED for License Plate Light Bulbs, K&N Filter, Bimmian LED Smoked Side Markers, Blackout roundels, Carbon Fiber Kidney Grills.
Retired Rides - 1989 325i convertible, 1995 M3, 2002 X5, 2005 545i, 2008 X5 (Lemon)
Let us know how the dealer sorts out their little "brain fart"!! 
