Lancia Motor Club Forum Banner
13 December, 2019, 02:11:15 PM *
Welcome, Guest. Please login or register.

Login with username, password and session length
 
   Home   Help Search Calendar Register  
Pages: [1]   Go Down
  Print  
Author Topic: Tyres  (Read 1805 times)
0 Members and 1 Guest are viewing this topic.
ben
Megaposter
*
Offline Offline

Posts: 456


« on: 24 November, 2015, 09:29:45 PM »

I have just bought a set of tyres for my Sport.

I was temped by the special offer on Cinturato's recently featured on here but in the end opted for a set of Uniroyals as advertised on ebay for 150 plus fitting rather than the 400 that the Cints would have cost.They are described as having an asymmetricaltread pattern giving excellent water dispersion in wet conditions and are branded as RAINEXPERT 3.Also they are 175/80 section so slightly wider than the original spec.

Having fitted them however I am not happy about the asymmetric aspect as it specifies on the tyres which side faces outwards which results in the rotation direction being correct for the nearside ones but in my eyes incorrect for the offside.
In the photo the tyres roll towards the viewer when fitted so that the angled grooves on the right tyre (marked with tippex arrow) squeeze the water away to the right, away from the contact patch, whereas the same grooves on the left hand tyre must surely pump the water into the centre of the contact!

The fitter who installed them assures me that this is common for asymetric treads but I cannot accept that this is right.

Can anybody shed any light on this.

It seems to me that the tyre treads on one side of the car should be a mirror image of those on the other side. Hence there needs to be a left and a right hand version with the rotation direction marked on them.

Ben


* Fulvia Tyres 001.JPG (731.12 KB, 2016x1512 - viewed 86 times.)

* Fulvia Tyres 003.JPG (738.2 KB, 2016x1512 - viewed 77 times.)
Logged
John B
Lapsed
Senior Member
*****
Offline Offline

Posts: 133



« Reply #1 on: 24 November, 2015, 09:51:56 PM »

Agree with your logic so checked what Uniroyal have to say about their tyres.......

http://www.uniroyal-tyres.com/www/uniroyal_tyres_gb_en/themes/summer-tyres/fd_rainsport-3/rainsport-3.html

......interesting!!
Logged

1961 Appia S3
1969 Fiat 850 Special
lancialulu
Press Officer
Permanent resident
*****
Online Online

Posts: 3622



« Reply #2 on: 24 November, 2015, 10:23:07 PM »

I seem to think I fitted these Uniroyal tyres recently to my Delta 1.6 GTie in France but not there so cannot check.... I have liked Uniroyal rain experts in the past and they were bought this time based on past experience and economic grounds...
Logged

Its not the winning but taking part! or is it taking apart?
1955 Aurelia B12
1967 Flavia Vignale iniezione
1967 Fulvia HFR
1972 1600 HF
1972 1600 Fulvia Sport
1978 Transformer HF3000 Strato's replica
1979 2500 Gamma Coupe
1988 Delta 1.6GTi.e.
DavidLaver
Permanent resident
**
Offline Offline

Posts: 3913



« Reply #3 on: 25 November, 2015, 12:55:43 AM »


Ben - I didn't realise you had a Flavia Sport - any chance of a photo?
Logged

David Laver, Lewisham.
lancialulu
Press Officer
Permanent resident
*****
Online Online

Posts: 3622



« Reply #4 on: 25 November, 2015, 09:57:16 AM »

Think it is posted under Flavia rather than Fulvia?? Must mean Ben is nearly there with his Fulvia if he is buying tyres!!
Logged

Its not the winning but taking part! or is it taking apart?
1955 Aurelia B12
1967 Flavia Vignale iniezione
1967 Fulvia HFR
1972 1600 HF
1972 1600 Fulvia Sport
1978 Transformer HF3000 Strato's replica
1979 2500 Gamma Coupe
1988 Delta 1.6GTi.e.
frankxhv773t
Permanent resident
**
Online Online

Posts: 1531



« Reply #5 on: 25 November, 2015, 01:44:15 PM »

That Uniroyal web site is pretty definitive that these are not directional tyres and the angled grooves must be towards the outside of the car regardless of whether those grooves end up angled with or against the direction of rotation. I agree it seems counter intuitive, even rather disturbing, but they designed them.

Frank T
Logged
ben
Megaposter
*
Offline Offline

Posts: 456


« Reply #6 on: 25 November, 2015, 06:20:58 PM »

Thanks for your comments on my tyres.
As Tim has deduced I have posted under Flavia by mistake.The car in question is a Fulvia Sport.
Incidentally regarding the width issue the tyres I took off were 185x70. I don't think one needs to worry about putting 175's on the standard 4.5" rims.
The wet grip rating is a "B". However the more I think about it the more the Uniroyal blurb seems flawed.If the big deep angled grooves are optimized for grip they surely will not still be optimized when the tyre is rotated in the opposite direction.
If my interpretation of how the grooves work is correct I should find that the car grips the (wet) road much better on right hand bends than on left hand ones.
I look forward to finding out---maybe in the next month or so if I run it without any trim!
Ben
Logged
sparehead3
Administrator
Permanent resident
*****
Offline Offline

Posts: 2637



« Reply #7 on: 25 November, 2015, 06:37:56 PM »

Hi Folks, for the future and keeping things in order I've moved into the correct Board Smiley
Logged

Regards,
Steve Pilgrim
No.13575

1993 Delta HF integrale Evo II (Hammond's Icon - No.4)

http://www.lanciadb.co.uk/
RobD
Lapsed
Senior Member
*****
Offline Offline

Posts: 180



« Reply #8 on: 28 November, 2015, 08:41:00 PM »

I think your cat's pregnant...
Logged

You're all entitled to my opinion.
'75 Fulvia 1.3S
'68 works Laverda 125cc ISDT
KTM 640 Adventure
Yamaha TDM 900
Numerous Gas Gas trail bikes...
www.adventureride.co.uk
JohnMillham
Rebel Poster
*
Offline Offline

Posts: 927



« Reply #9 on: 28 November, 2015, 10:57:21 PM »

Agree with your logic so checked what Uniroyal have to say about their tyres.......

http://www.uniroyal-tyres.com/www/uniroyal_tyres_gb_en/themes/summer-tyres/fd_rainsport-3/rainsport-3.html

......interesting!!
I have just ordered a set of Michelin winter tyres and wheels for my Yeti and will be interested to see if they are all fitted the same way round!
Regards, John
Logged
lancialulu
Press Officer
Permanent resident
*****
Online Online

Posts: 3622



« Reply #10 on: 29 November, 2015, 08:58:27 AM »

Agree with your logic so checked what Uniroyal have to say about their tyres.......

http://www.uniroyal-tyres.com/www/uniroyal_tyres_gb_en/themes/summer-tyres/fd_rainsport-3/rainsport-3.html

......interesting!!
I have just ordered a set of Michelin winter tyres and wheels for my Yeti and will be interested to see if they are all fitted the same way round!
Regards, John
my dunlop winter tyres fitted to a spare set of wheels for my Gamma are sided......
Logged

Its not the winning but taking part! or is it taking apart?
1955 Aurelia B12
1967 Flavia Vignale iniezione
1967 Fulvia HFR
1972 1600 HF
1972 1600 Fulvia Sport
1978 Transformer HF3000 Strato's replica
1979 2500 Gamma Coupe
1988 Delta 1.6GTi.e.
Pages: [1]   Go Up
  Print  
 
Jump to:  

Contact the Forum Administrator

LMC Forum copyright © 2007 - 2018 Lancia Motor Club Ltd

Powered by SMF 1.1.20 | SMF © 2006-2011, Simple Machines