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MR2 Roadster Owners Club

The Workshop => Performance Related => Topic started by: mph on August 13, 2003, 22:59

Title: mixing tyres (17" wheels) help!
Post by: mph on August 13, 2003, 22:59
Decisions decisions.

Goodyear Eagle F1s:

It seems you can't get 205/40s in GS-D2, nor can you get 225/35 in GS-D3 - these being the optimum sizes to maintain the rolling raduii against the original 15s.

So what are your thoughts on:

Option A:
Mixing 205/40 GS-D3s at the front & 225/35 GS-D2s at the rear.

or

Option B:
Using 205/40 & 215/40 all in GS-D3s.


Note that 215/40 give a +3.0% sizing error vs. +0.6% sizing error with the 225/35.
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Post by: Anonymous on August 13, 2003, 23:05
Why 17!?
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Post by: mph on August 13, 2003, 23:08
Quote from: "WoodenDummy"Why 17!?
'Cos I have a set of 17x7" wheels for road use, and the stock 15s for track use. The 17s are currently nekkid (and hence why I was on stocks for JAE) but since I'm off to do the Dijon & Magny Cours circuits, I need to get both sets up and going.
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Post by: Anonymous on August 14, 2003, 00:54
Quote from: "mph"...since I'm off to do the Dijon & Magny Cours circuits, I need to get both sets up and going.

When is this, I might be interested to come and have a watch/go.
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Post by: mph on August 14, 2003, 08:40
Quote from: "victor"When is this, I might be interested to come and have a watch/go.
Sunday 24th @ Dijon-Prenois; Monday 25th @ Magny Cours. Details at BookaTrack (http://www.bookatrack.com). They'll need to know ASAP if you're intending to come along and watch or wanting to passenger etc.
Title: Re: mixing tyres (17" wheels) help!
Post by: Sam on August 15, 2003, 16:59
Quote from: "mph"Decisions decisions.

Goodyear Eagle F1s:

It seems you can't get 205/40s in GS-D2, nor can you get 225/35 in GS-D3 - these being the optimum sizes to maintain the rolling raduii against the original 15s.

Hi Martin,

You can get those sizes as I put 17's on last week and I put 205/40 and 225/35 Eagle F1 GSD2s on. I got them from Hi-Q (Owned by Goodyear).

Let me know if you need contact details etc.

Sam
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Post by: mph on August 15, 2003, 20:14
That does it then, 205/225s it is. Oh my 35 profile - that's not a lot of sidewall flex before the tail comes out   s:shock: :shock: s:shock:
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Post by: Anonymous on August 15, 2003, 20:17
Quote from: "mph"Oh my 35 profile - that's not a lot of sidewall flex before the tail comes out   s:shock: :shock: s:shock:

I know that the 35/40/50/whatever is the relation of the sidewall to the tyre width.  But does a 35 tyre inherently have less sidewall flex than a 50 profile tyre?

 I ask because surely something like 205/50 and 225/35 have the same height sidewall, even if the relation of sidewall to width is different.
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