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 Post subject: Correct Tyre Size ?
PostPosted: Sun Feb 01, 2015 8:26 pm 
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Joined: Thu Oct 10, 2013 10:17 pm
Posts: 45
Whats your location?: Sligo
Region: Western
What Size Tyre Were Fitted as standard to the 4.5 x 12 Minilite style Alloy wheel on an SPI Mini ?


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 Post subject: Re: Correct Tyre Size ?
PostPosted: Sun Feb 01, 2015 10:02 pm 
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Joined: Sun Feb 06, 2005 10:52 pm
Posts: 1514
Whats your location?: Dublin
Region: Eastern
145 / 70 x 12


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 Post subject: Re: Correct Tyre Size ?
PostPosted: Mon Feb 02, 2015 12:14 pm 
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Joined: Thu Oct 10, 2013 10:17 pm
Posts: 45
Whats your location?: Sligo
Region: Western
I bought a set of 4.5 x 12 Spi Alloys fitted with 165/60 x 12 Tyres, Would these upset the Speedo much ?


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 Post subject: Re: Correct Tyre Size ?
PostPosted: Mon Feb 02, 2015 12:55 pm 
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Joined: Fri Feb 04, 2005 10:05 am
Posts: 4660
Whats your location?: Longford
Region: Eastern
What Minis have you?: 1971 Mini Marcos.
1984 Mini Sprite
PROJECT X
Modifications: 1380cc
Weber45
S/C CR gearbox and drop gears
Location: Longford
Just doing the maths, the 165/60 would be 1mph slower at 4000rpm in 4th gear.

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 Post subject: Re: Correct Tyre Size ?
PostPosted: Mon Feb 02, 2015 9:34 pm 
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IMOC Paid Member

Joined: Thu Oct 10, 2013 10:17 pm
Posts: 45
Whats your location?: Sligo
Region: Western
Is there much difference height wise between the 145/70 and the 165/60 ?


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 Post subject: Re: Correct Tyre Size ?
PostPosted: Tue Feb 03, 2015 11:22 am 
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Joined: Fri Feb 04, 2005 10:05 am
Posts: 4660
Whats your location?: Longford
Region: Eastern
What Minis have you?: 1971 Mini Marcos.
1984 Mini Sprite
PROJECT X
Modifications: 1380cc
Weber45
S/C CR gearbox and drop gears
Location: Longford
Redned wrote:
Is there much difference height wise between the 145/70 and the 165/60 ?



Again doing the maths and assuming that both tyres were inflated to the same pressure, then the 145/70 would be 2.5mm taller than the 165/60.

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 Post subject: Re: Correct Tyre Size ?
PostPosted: Tue Feb 03, 2015 10:30 pm 
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Joined: Thu Oct 10, 2013 10:17 pm
Posts: 45
Whats your location?: Sligo
Region: Western
I need to replace the tyres on these rims, what size would be the best to go for 145/70x12 or 165/60x12 ?


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 Post subject: Re: Correct Tyre Size ?
PostPosted: Wed Feb 04, 2015 10:40 am 
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Joined: Mon Feb 07, 2005 11:55 pm
Posts: 2627
Whats your location?: Drogheda
Region: Eastern
What Minis have you?: Traveller
Turbo
Hornet
Equinox
MINI Clubman
Location: LOUTH
Minis are light cars with a small tyre footprint so the most important thing for grip is a good quality tyre, after that the wider the tyre the bigger the footprint.
Personally on my standard car I use 165/70 x12 Falkans. Not as good as yokoahamas in the rain but good in dry and damp conditions and longer lasting.

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 Post subject: Re: Correct Tyre Size ?
PostPosted: Sun Feb 08, 2015 2:55 pm 
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Joined: Tue Jul 18, 2006 11:15 pm
Posts: 2075
Whats your location?: Dún Laoghaire, Dublin
Region: Eastern
What Minis have you?: '93 SPi cooper
Location: Dún Laoghaire, Dublin
when i bought my SPi it had 165's (falken) on the standard mini alloy rims. roadholding was good but the steering was slightly vague. recently changed to 145's and the steering became wonderfully sharp again - i haven't found any problems with roadholding, but i don't drive it that hard anymore.

i would imagine that its probably best not to go too far from factory spec

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