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Viewing Topic: Think I might have put the wrong size tyres on!

#85897
PostWed Jul 02, 2008 9:03 am
RedRummy
Location:Hove
Drives: 1994 Mazda RX-7
Joined:13 Mar 2007
Posts:1141

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Oops..

Just changed my rear tyres.... used to have 245/45 17 but thought I'd go for something wider and put on 255/40 17..

Now the back end feels really unstable at speed... feels pretty unsafe.

Feels like the tyres are moving about on the rims.... if you know what I mean.. (doubt they are, but it feels weird)

Not sure of the offset of these rims, but it should be able to handle a jump from 245/45 to 255/40 no?

Not sure if it has only affected the tracking and that needs sorting out or what.
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#85898
PostWed Jul 02, 2008 9:09 am
Administrator AdamR
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Location:Brighton
Drives: 1993 Subaru Impreza WRX
Joined:25 Jul 2006
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its not the offset, its the width Smile

I bet its the balancing...


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#85902
PostWed Jul 02, 2008 9:58 am
RedRummy
Location:Hove
Drives: 1994 Mazda RX-7
Joined:13 Mar 2007
Posts:1141

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it feels like its steering from the rear... like HICAS LOL

You mean balancing as in not balanced properly when they put them on?

or tracking?
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#85903
PostWed Jul 02, 2008 9:59 am
Administrator AdamR
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not balanced properly when you had the tyres fitted

either that or one has less/more pressure than the other, enough to make it feel like that


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#85904
PostWed Jul 02, 2008 10:04 am
RedRummy
Location:Hove
Drives: 1994 Mazda RX-7
Joined:13 Mar 2007
Posts:1141

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hmm... I'll check the pressure and take them back then...

bloody muppets.
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#85941
PostWed Jul 02, 2008 7:14 pm
Stu C
Location:West Sussex
Drives: 1994 Nissan Skyline R33 GTS25t
Joined:06 Sep 2006
Posts:1935

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Is it tram lining? Mine does it like mad Confused


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My car eats all my money.......
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#85945
PostWed Jul 02, 2008 7:36 pm
Jock
SJC Member
Location:Brighton
Drives:Fast
Joined:13 Oct 2006
Posts:4035

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im with Stu,
wider wheels are causing the car to tramline,
mines got alot worse when i went from 245's to 255's


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#85946
PostWed Jul 02, 2008 7:57 pm
RedRummy
Location:Hove
Drives: 1994 Mazda RX-7
Joined:13 Mar 2007
Posts:1141

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didn't happen at all with my 245/45's

is scary at speed with the 255/40's
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#85948
PostWed Jul 02, 2008 8:54 pm
g10 gdw
Location:West Sussex
Drives: 1992 Mazda RX-7
Joined:02 Jun 2007
Posts:1016

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tramline...? Confused


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#85958
PostWed Jul 02, 2008 9:41 pm
subyea81
SJC Event Organiser
Location:Scaynes Hill/h Heath
Drives: 1993 Subaru 1800
Joined:21 Jan 2008
Posts:401

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yeah i thought i broke something when i put my new rims and tyres on

started as 185/70/13 up to 205/45/16

BIIIG difference!

it pulls everywhere, and i got no power assisted like most of you! and balancing im with, mine shake at the rear due to not being balanced properly, colins is the same!


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#85973
PostWed Jul 02, 2008 10:57 pm
RedRummy
Location:Hove
Drives: 1994 Mazda RX-7
Joined:13 Mar 2007
Posts:1141

OFFLINE

yeah, at first I thought they hadn't put the bolts in properly! even got out to check... LOL

Then thought it was the greasy coating... left it for a couple of days, but its just not safe at speed...

used to hold the road like a bloody go kart, now it feels like its got shopping trolley wheels on Nutty
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