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Weight considerations - OEM 14" vs Three piece 15"

 
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XLR8  



Joined: 30 Mar 2016
Posts: 111
Location: Byron Bay, Australia

PostPosted: Fri May 04, 2018 4:32 pm    Post subject: Weight considerations - OEM 14" vs Three piece 15" Reply with quote

Hi all,

I have two sets of tyres/wheels options for my '82 NA (see below - getting new tyres soon).

The car runs standard springs, OEM dampers and 968 sway bars. It handles very well now with 14" wheels.

However, I am seeking advice on whether the additional rotating weight of the 15" wheels will more than offset the otherwise better handling of the bigger wheels and wider tyre?

Or am I being pedantic here .....?

The two tyre wheel options I have are below:

14x6.5J "Original "Tarantula" alloys - 6.5kgs (14.3lb) each (excl 195/65R14 tyres)
15x7J Three piece alloys - 8.0kgs (17.6lb) each (excl 205/55R15 tyres)

Thanks in advance!
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'89 Eunos Roadster NA6
'06 Landcruiser HDJ100
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CÚdric  



Joined: 27 Aug 2004
Posts: 1683
Location: Sweden

PostPosted: Fri May 04, 2018 5:08 pm    Post subject: Reply with quote

Weight isn't such a big issue, but the total diameter is. Try to keep it as low as possible, it really makes a significant difference in acceleration due to the gearing differences.

But on lap time wise you will definitely win with the new setup. Just by the best tyres you can afford.
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XLR8  



Joined: 30 Mar 2016
Posts: 111
Location: Byron Bay, Australia

PostPosted: Fri May 04, 2018 7:43 pm    Post subject: Reply with quote

CÚdric wrote:
Weight isn't such a big issue, but the total diameter is. Try to keep it as low as possible, it really makes a significant difference in acceleration due to the gearing differences.


Cool. The suggested tyre sizes have the same diameter.

CÚdric wrote:
But on lap time wise you will definitely win with the new setup. Just by the best tyres you can afford.


OK, sound advice. Thank you.
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'89 Eunos Roadster NA6
'06 Landcruiser HDJ100
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