McLaren F1 successor

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the EDGE
the EDGE
136
Joined: Mon Feb 13, 2012 5:31 pm
Location: Bedfordshire ENGLAND

Re: McLaren F1 successor

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AngusF1 wrote:
Fri Jul 02, 2021 9:38 pm
Let's discuss the tyres.
  • McLaren F1: 235/45/17 fronts, 315/45/17 rears.
  • GMA T50: 235/35/19 fronts, 295/30/20 rears.
Why such smaller aspect ratios ? Possibilities I can think of include:
  1. Fashion.
  2. The brief has changed from sports-touring more towards sports. The car will be less comfortable with more NVH in return for (perceived?) better handling response and/or steering feel.
  3. Modern tyres can provide similar comfort with lower profiles.
  4. Modern dampers can provide similar comfort with lower profile tyres.
  5. Larger wheels were needed for mechanical and brake packaging.
  6. The original 45-section tyres were an eccentric choice by Murray which suited his personal tastes but almost nobody else's.
Anyone have any thoughts on this?


Angus
They’re not actually that dissimilar

Larger rims with lower profile tyres to give less role, but over-all, the external diameters remain about the same

No change to the width of the front tyres, but slightly narrower rear tyre.
This would reduce drag, but also grip which I assume the ridiculous amounts of DF more than makes up for

e36jon
e36jon
55
Joined: Mon Apr 25, 2016 1:22 am
Location: California, USA

Re: McLaren F1 successor

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Regarding tire sizes, the actual tread width gets wider with the lower profile tires. From the Tire Rack website, for the same make of tire (Michelin max performance something or other. Sorry, didn't write it down.):
  • 235/45/17 tread width = 7.8"
  • 235/35/19 tread width = 8.4"
I was unable to compare rears since they don't carry any 315/45/17's!

I may have missed rim widths earlier but wider rims also increase tread width up to a point.

All of the above also doesn't discuss drive-ability. The lower sidewall tires have a much more abrupt transition from grip to slide. Couple that with less ability to deal with road imperfections and it's no wonder so many hyper/super cars end up in guardrails, swimming pools, etc...

Cheers,

Jon

Just_a_fan
Just_a_fan
772
Joined: Sun Jan 31, 2010 7:37 pm

Re: McLaren F1 successor

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I think a lot of move to big wheels, low sidewalls on road cars is fashion. The German manufacturers, for example, went down this route some time ago. Great if you have nice smooth roads. Rubbish if the surface is broken / rutted etc.

There seems to be an idea that rubber bands on big diameter rims "fills the arches" more, but it must be a personal thing as I think the same overall size but with more sidewall fills the arches better.

Too many of the people designing cars these days do sketches of missiles with huge wheels - and that's what gets built.
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