Author |
Topic: TYRES (Read 4462 times) |
|
johnv
Guest
|
I just been looking around on the Web and it saying change your tyres at 2mm Well I do.
but its saying that if your car has wider tyres (but it does not mention what size) you should replace at 3 mm to resist aquaplaning
so do we need to change 225 tyres at 3mm.
The cheapest Michelin Pilot Primacy tyres I can find at the moment is £128 thats all in, fitted with new valve and balance.
But if you don't mind what make you could have,
Kumho ECSTA 712 at £77.94 all in
or if you got money to burn then
Yokohama AO22 at £214.32 all in. I presume you get a real gold valve for that price.
|
|
 IP Logged |
|
|
|
Baz
Moderator
Senior Member
S Reg. 1998 24v Cosworth S2.9 COS (Deceased)
Posts: 4009
|
 |
Re: TYRES
« Reply #1 on: Mar 4th, 2005, 12:04am » |
 Quote  Modify
|
I've just ordered a set of Yokos for my nice new (to me anyway) 17" 7 spokes which I finally got after 2 years of looking!! Having them all fitted tomorrow!!
Baz
|
|
IP Logged |
|
|
|
johnv
Guest
|
hey baz, what happen to your love of Michelin Primacy tyres. Test reports say they are very quiet, good rolling resistance, longer lasting and very good grip.
So why change. (Just picking your brains)
And why change to 17 inch wheels. Is it because the larger the wheels the slower they turn around so making it safer.
Like a mini travelling at say 60 MPH and you with your 17 inch wheels travelling at 60 MPH side be side.
The mini wheels would be screeming around to yours that would be just going around must slower.
|
|
IP Logged |
|
|
|
Richard
Guest
|
Johnv,If the rolling radius of a wheel and tyre are the same then it doesn't matter if you have a 14" or 20" wheel, they will still turn at the same speed,  
|
|
IP Logged |
|
|
|
urbanracer
Full Member
I love YaBB 1G - SP1!
Posts: 155
|
|
Re: TYRES
« Reply #4 on: Mar 4th, 2005, 1:47pm » |
Quote Modify
|
Its not rolling radius,its rolling circumference.But what you said is correct.
If you think about it the wheel tyre radius changes through its revolution.
Rolling radius might be correct for a train wheel but then again there may be some deflection.
|
|
IP Logged |
|
|
|
Richard
Guest
|
That may be correct for a dragster as the tyres are designed to stretch and act like a gear but this would be very minimal on a car tyre to act in this way, If this did happen then the rolling circumference would change and not give a correct speedo reading.
http://www.webster-inst.com/techinfo/equation/eqnfr/eqn15.htm
|
|
IP Logged |
|
|
|
urbanracer
Full Member
I love YaBB 1G - SP1!
Posts: 155
|
|
Re: TYRES
« Reply #6 on: Mar 4th, 2005, 2:43pm » |
Quote Modify
|
I spent many years working for Goodyear,all tyre engineering data for rolling circumference is calculated on that the correct tyre is fitted to the correct rim
at the correct pressure
and under the design load tolerences
this then gives a revs per mile figure.
I have not yet read your link,but these so called Bibles are not always totally correct.
.
|
|
IP Logged |
|
|
|
johnv
Guest
|
well those recent replies have done my head in for sure.
All I know is this,
On the kitched table i got two lids off food containers. One small one and one large one.
I put them at one end of the table and rolled them along.
At the end of the table, the small lid had gone around many, many more times and it also had took longer.
Sort that one out if you can.
|
|
IP Logged |
|
|
|
johnv
Guest
|
and i bet 17" inch wheels will give you more miles per gallon.
Well, stands to reason, the wheels will have less distance to travell than smaller ones, so that's going to save you fuel.
I have a feeling this thread could become very long.
|
|
IP Logged |
|
|
|
Highlander
Moderator
Expert
13 Scorpios, XR4x4, Suzuki SJ413 for off road :)
Posts: 8244
|
|
Re: TYRES
« Reply #9 on: Mar 6th, 2005, 5:11am » |
Quote Modify
|
Does anyone have a gun I could borrow.... 
|
|
IP Logged |
on Oct 17th, 2011, 12:35pm, Simmo wrote:I give up !  Too much for an old boy!  |
|
|
|
|
SaveTheNight
Senior Member
I can resist anything ...except temptation !!
 
Posts: 1961
|
|
Re: TYRES
« Reply #10 on: Mar 6th, 2005, 6:30am » |
Quote Modify
|
yes Highlander !! ..many members shot themselves last time this was discussed over about ten pages ... haha !! ..some chose the head and many the FOOT !!
anyway ... rolling radius is the measurement from the centre of the wheel to the outside of the unladen tread and of course it matters ... this page is the one we usually all quote and it's definitive and simple ..
http://www.chris-longhurst.com/carbibles/index.html?menu.html&tyre_b ible.html
there ya go lads and let battle begin ..... regards .........STN
|
|
IP Logged |
|
|
|
Richard
Guest
|
LOL, Thanks STN.
Johnv, all i am going to say is that it is the tyre profiles is the important bit, If you say had a 15" wheel fitted with a 195/65 tyre it would give you almost identical figures to that of a 19" wheel fitted with a 215/35 tyre,
The wheel may be 4" bigger but the profile of the tyre is what make it the same rolling radius. 
|
|
IP Logged |
|
|
|
Richard
Guest
|
Johnv, If you read STN's link then all will become clear or maybe confuse you more,lol.
|
|
IP Logged |
|
|
|
granorpio
Full Member
1998 Silver Facelift Cosworth
Posts: 589
|
|
Re: TYRES
« Reply #13 on: Mar 6th, 2005, 2:10pm » |
Quote Modify
|
Talking of tyres has anyone ever had fitted on their Scorp Pirelli and if so what do you think of them
|
|
IP Logged |
- Mike -
So nearly said "goodbye" but now Scorpio will see another day, alongside the replacement! eek!
|
|
|
Vulcan
Guest
|
on Mar 6th, 2005, 5:11am, Highlander wrote:| Does anyone have a gun I could borrow.... |
|
There ya go....
|
|
IP Logged |
|
|
|
scorpio_man
Administrator
Ford Kuga awd
Posts: 5654
|
 |
Re: TYRES
« Reply #15 on: Mar 6th, 2005, 5:45pm » |
Quote Modify
|
Quote:| Talking of tyres has anyone ever had fitted on their Scorp Pirelli and if so what do you think of them |
|
hi there
here's a write up from eric...pirelli
i tend to agree with him. lots of grip= lots of wear
i run with Vredestein Sportrac2 (see bottom of web site page)
|
|
IP Logged |
|
|
|
urbanracer
Full Member
I love YaBB 1G - SP1!
Posts: 155
|
|
Re: TYRES
« Reply #16 on: Mar 6th, 2005, 6:36pm » |
Quote Modify
|
well I disagree as I said for many years I worked for Goodyear the correct term is rolling circumference this is then calculated in engineering and technical data books as will give the revs per mile figure.
The statics loaded
radius is what it says static if you apply this figure and then call it a rolling radius all calculations will be wrong,
I could scan parts ot various tech data books but it will take up a lot of bandwith.
As i said earlier these so called bibles do have mistakes some of the info has been lifted from various manufacturers and a sudstancial part from an early 1970/1980's Goodyear traffic patrol officers course
most of the site is correct but its these mistakes that people then take on board as fact.
|
|
IP Logged |
|
|
|
Pegasus
Full Member
24V Cosworth Ultima Born: Sept 97, sold Aug 23
Posts: 742
|
|
Re: TYRES
« Reply #17 on: Mar 6th, 2005, 6:50pm » |
Quote Modify
|
Pirelli tyres:
P6000 - 225/50/16W.
My last lot lasted 25k. 
(changed when got down to 3mm)
Anyone do any better?
Cheers
P
|
|
IP Logged |
|
|
|
urbanracer
Full Member
I love YaBB 1G - SP1!
Posts: 155
|
|
Re: TYRES
« Reply #18 on: Mar 6th, 2005, 7:04pm » |
Quote Modify
|
Some might find this usefullits abdobe reader here you will see static radius and rolling circumference.
|
|
IP Logged |
|
|
|
johnv
Guest
|
81,000 on a mk two transit. that solid beam axle at the front is the trick dunlop tyres.
a builder i knew had a mark three transit from new, and had to replace his front ones at 8,000 miles
|
|
IP Logged |
|
|
|
|
Home
Help
Search
Members
Login
Reply
Send Topic
Print
Remove