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        General >> Problems >> tyres?
        
(Message started by: bobtheyop on Feb 20^th, 2005, 9:50pm)

Title: tyres?
Post by bobtheyop on Feb 20^th, 2005, 9:50pm

hello people,

just a quick question,
what would be the best tyre to use 195x65x15 or205x60x15,i.e road holding/economy etc.
got a few of both and i'll need to buy one possibly
two for the next mot,

regards,
bob.

Title: Re: tyres?
Post by ren on Feb 20^th, 2005, 10:11pm

The way i understand tyres is that the
Wider i e the 205=more holding less economy
narrower the 195=more economy less holding

ren

Title: Re: tyres?
Post by Badboytunes on Feb 20^th, 2005, 10:21pm

size doesnt really matter regarding ecomonmy. Thats mainly down to the compound of the tyre.... the wider the width will mean more grip but you wont nec' lose any economy because of it.....

Cheers Nick

Title: Re: tyres?
Post by Geoff_W on Feb 20^th, 2005, 10:25pm

Except on Ice/snow when skinny can be helpful :)

Title: Re: tyres?
Post by ren on Feb 20^th, 2005, 10:27pm

isnt a 195 cheaper to buy than a 205 then?

Title: Re: tyres?
Post by johnv on Feb 21^st, 2005, 6:44am

well. my 1996 2.0 left the factory with 195X65X15 and the same car had it left the factory with a cosworth engine would have been fitted with the 205X65X15 tyres.
But I replaced my wheels with 12 spokes from the 7 egg shaped hole wheels.
So I got now 225X50X16 tyres now.

Notice nothing different. The fuel computer on the dash is telling me that I getting the same fuel figures as before the tyre change.

Title: Re: tyres?
Post by johnv on Feb 21^st, 2005, 6:50am

forgot to say yes of course the 195 is cheaper to buy than a 205 but when you get to 225 they cost even more.
but in my case i don't mine the extra exspence, more tyre on the road, i saying to myself is better grip, so safety is my main concern.
if i want to save money, i can always go to budget tyres.
but driving, i notice no differents, but i got it in my head that more tyre on road as got to be safer.
someone tell me if you think i am wrong.

Title: Re: tyres?
Post by Geoff_W on Feb 21^st, 2005, 10:18am

Well johnv you are mostly right but in some seasons wrong

on 02/20/05 at 22:25:46, Geoff_W wrote:

Except on Ice/snow when skinny can be helpful :)

Big ballon tyres are good over soft snow but less good on ice.

In this case, high power and large surface area can cause slippage, however if you also have the benefit of traction control it probably works out fine.

Thats why winter tyres in Scandinavia tend to be skinnier and tread pattern is more important

Interesting to get peoples thoughts/experiences over
the next couple of snowy icy days.

Already know that some of our more fun loving members will be reaching for the on/off switch on their traction control.

Title: Re: tyres?
Post by low_tom on Feb 21^st, 2005, 2:05pm

traction control aka the missus ;D

on a serious note,i've found a couple of websites that offer good prices for tyres

http://www.mytyres.co.uk/start.html

and

http://www.blackcircles.com/

just if anyone needed any

Title: Re: tyres?
Post by Nick_H on Feb 21^st, 2005, 6:41pm

Hi All,

Thought I'd join in this thread with a question of my own:

I was out at the weekend scoping for a new Scorp and I spotted a nice cossie (albeit too pricey for my liking).

It had 225/50 ZR16 tyres on the 12-spoke wheels.

Now earlier today, I bought myself a 2.3 with exactly the same tyres & wheels. I was surprised, especially as the performance won't come anywhere near the Cossie, yet the tyres were the same.

Anyway, my favourite tyre calculator web page: http://www.chris-longhurst.com/carbibles/index.html?menu.html&tyre_bible.html suggests that using 205/55 ZR16 tyres will do the same job - moreover this very site says that the 12-spoke wheels can be fitted with 205/55 no problem.

My question: Has anyone here actually done this change (225/50 to 205/55) and have they noticed any effects, ill or otherwise?

Thanks, all!

Title: Re: tyres?
Post by bobtheyop on Feb 21^st, 2005, 8:19pm

hello all,

great response to a simple question,thanks for the help,
i'll go with the 205s as any improvement in roadholding
would be beneficial to what is already a great driving car.
thanks again for the input,

regards,
bob.

Title: Re: tyres?
Post by VMAN on Feb 21^st, 2005, 8:42pm

Hi Nick,
Because the outside diameter of the 205/55/16 tyre is approx 95.5% of the outside diameter of the 255/55/16 it means that if the speedometer was callibrated for the 255/55/16 and you were traveling at 70 mph on the 205/55/16 tyre you would in fact be traveling at approx. 66.85 mph (I wonder if this could explain why some people have noticed a differance in speedometer clock readings and those of sat nav systems).

If you can live with the above and the trade off in grip then I don't think there is a problem.

Regards John

Title: Re: tyres?
Post by Nick_H on Feb 21^st, 2005, 8:52pm

Hi John,

Cheers for the response, but the 225's were a 50 aspect ratio, not a 55.

The figures suggest that the rolling radius difference is 1.57mm (+0.08%), giving a "70mph" speed of 70.06mph.

Cheers,
Nick

Title: Re: tyres?
Post by VMAN on Feb 21^st, 2005, 8:53pm

That will teach me to read posts better LOL

John

Title: Re: tyres?
Post by VMAN on Feb 21^st, 2005, 8:57pm

Hi Nick,
On recalculation using 225 instad of 255 (DOH) they are all withinin 0.5% if each other.

John

Title: Re: tyres?
Post by music_master on Feb 21^st, 2005, 9:08pm

i.ve got a set of 225 on my 2.3 ultima est and i think they hold the road alot better than a 195 which i had on my scorp deisel and i think that the car handles much better with the wider tyre 8)

Title: Re: tyres?
Post by Baz on Feb 21^st, 2005, 9:33pm

Page 21 of the Ford accessories book states that cars with the 12 spokes (6.5 x 16" E40) can have a tyre size of 205/55 or 225/50

the 7 spoke 17" wheels can be fitted with 215/50, 225/45, 235/40 or 235/45 tyres now there is a difference for you!!

The strange thing is that the brochure was produced in July 98 which was a month or so after they stopped making the cars and it still has a full list of accessories!!

Baz

Title: Re: tyres?
Post by johnv on Feb 21^st, 2005, 9:47pm

Now earlier today, I bought myself a 2.3 with exactly the same tyres & wheels. I was surprised, especially as the performance won't come anywhere near the Cossie, yet the tyres were the same.
--------------------------------------------------------------------
Hi to Geoff, I don't intend to do much driving on ice. Nasty stuff that, it cold for a start.
--------------------------------------------------------------------
TYRE SIZES are on page 148 on owners handbook.
---------------------------------------------------------------------
This is what I understand, up to round about November 1996, cars rolled out the factory on 195 and the 205 on cosworth.
The 2.3 engine was not around then.
Then round about November 1996, the 2.3 engine came about which more or less put paid to the 2.0 engine. I suppose you could have it to order, but who would want it over the 2.3.
So at that time, the wheels changed to 12 spoke. which where fitted with the 225 tyres on the 2.3 and the cosworth.
Both mine 2.3 cars had the 225 tyres on when I obtained them.
-------------------------------------------------------------------
On my 2.0 this had 195 and I drove on these for two years or so,
Then I wanted a spare alloy wheel to replace the steel wheel in the boot but they sellor would only sell the set of four. so I had these.
These where fitted with 205 tryes as the car they came off was a cosworth. As the tyres where very good, I put these on to replace the 195.
Then I put on 12 spoke wheels with 225 tyres.
In driving, you will not notice any differents. the steering feels the same.
but the benefit, may be hidden, like the more rubber on the road as surely got to be safer.

Title: Re: tyres?
Post by scorpio_man on Feb 21^st, 2005, 9:47pm

hi there

Quote:

Now earlier today, I bought myself a 2.3 with exactly the same tyres & wheels. I was surprised, especially as the performance won't come anywhere near the Cossie, yet the tyres were the same.

flat out the 2.3 can hit nearly 130 mph (laws permiting)! :o . hence the same wheel/ tyre combination.
not too bad for a big car.

Title: Re: tyres?
Post by low_tom on Feb 21^st, 2005, 9:58pm

the 2.0 ain't too far behind. mines sitting on 185/60/14 and hopefully will soon be down to 155/80/13,stretched over 13x7. gilrfriends audi is on 225/45/18 goodyear eagles and sticks like sticky stuff to a hairy blanket. Not very keen on low-pro's tho,stick well,but not a massive amount of warning before they break away.

Title: Re: tyres?
Post by Badboytunes on Feb 21^st, 2005, 9:59pm

I thought the rolling radius determined the "spped of the wheel. Not the width.... Ie 205/60/15 will indicate a higher speedo reading than say a 205/45/15. am i wrong?

Cheers Nick

Title: Re: tyres?
Post by low_tom on Feb 21^st, 2005, 10:04pm

yup. so say you used your example of 205/60 compared to 205/45 the rolling radius is increased,the top speed(if the car would pull it)would be increased and the acceleration decreased. Changing from the 195/60/15s to the 185/60/14s my speedo over-reads by 5mph,but it was noticeably quicker throught the gears and would hold top all the way to the limiter.