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T
Curmudgeon
Joined: 17 May 2001
Posts: 16076
Location: Airstrip One
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Posted:
Wed Jun 27, 2007 10:02 am Post subject: Tyres - Do the treads need to face the same way? |
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I had both front tyres on my ride (front-wheel drive) replaced today, and the new ones look a bit odd. The car was wearing Pirelli P7 all round; it's now wearing Dunlop SP Sport 3000 on the front.
They don't have rotational indicators on the walls (nor did the originals), but do have a "mount this side out" instruction on one wall.
The tread pattern is thus reversed between the two wheels. The part of the pattern that I can see (the bit towards the outside edge) points towards the front of the car on the right-hand side tyre, and towards the back of the car on the left-hand side tyre.
When I queried this, the tyre fitter muttered something about "asymmetric" something-or-other (didn't catch it all) and left it at that.
Any idea what he might have meant, and if I need to be concerned about the difference in tread direction? |
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T
Curmudgeon
Joined: 17 May 2001
Posts: 16076
Location: Airstrip One
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Posted:
Wed Jun 27, 2007 10:10 am Post subject: |
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Never mind. I found out the answer.
Look down at the tyre. Note the tread pattern. Now spin the tyre 180°. Note the tread pattern. It's the same. The left-hand side and right-hand side are rotational reflections of each other, not mirror images.
This is, presumably, why there is the "mount this side out" instruction, rather than rotational indicators. |
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affabletoaster, Akely, anglachel, blahpony, CMTG, EdisonRex, Elk, Equin, evilness, Fido, fathertyme, Goddess, Jaymac, je, jodygirl, KingKobra, Lycander, mally, Max, OhioArt2, perrito_blanco, Rover, Spot, sully_51, Superdwarf, the taz man, thriftyjack, twiztid, wrathiron, yiayia49
A journey of 3,500 miles begins with a single comic.
Would you like good music at a price that is right? CD Baby, baby.
The best way to blow off steam is to blow off someone's nadgers.
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EdisonRex
Guide Dog
Joined: 06 May 2002
Posts: 9987
Location: Not Moscow
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Posted:
Wed Jun 27, 2007 11:01 am Post subject: |
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Toxin wrote:Never mind. I found out the answer.
Look down at the tyre. Note the tread pattern. Now spin the tyre 180°. Note the tread pattern. It's the same. The left-hand side and right-hand side are rotational reflections of each other, not mirror images.
This is, presumably, why there is the "mount this side out" instruction, rather than rotational indicators.
I was going to try to explain that. The tread pattern needs to be symmetrical, not parallel, in order for the traction to be best in bad conditions. |
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Exille
Stray Dog
Joined: 26 Feb 2005
Posts: 37
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Posted:
Sun Jul 01, 2007 9:26 pm Post subject: |
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You have to be careful about this because there are some tires that are indeed directional and can and should only be mounted with the tread facing a certain way. |
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Akely
Moderator
Joined: 16 Nov 2002
Age: 42
Posts: 5901
Location: Sweden
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Posted:
Mon Jul 02, 2007 12:16 am Post subject: |
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Exile is correct. Thows tyres have markings on the to point out the direction the tyre should roll. I've never seen aything other than a big arrow on the tyreside.
/Akely |
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Akely
Moderator
Joined: 16 Nov 2002
Age: 42
Posts: 5901
Location: Sweden
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Posted:
Mon Jul 02, 2007 12:21 am Post subject: |
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Akely wrote:Exile is correct. Tyres which must travel a certain way have markings on the to point out the direction the tyre should roll. I've never seen aything other than a big arrow on the tyreside.
/Akely
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expressed in dollars and cents,
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makes perfect sense?
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anglachel
Guide Dog
Joined: 08 Nov 2003
Posts: 8245
Location: MN
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Posted:
Mon Jul 02, 2007 5:02 am Post subject: |
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make sure not to get a directional tire for your spare... or if you do, get two of them one left and one right. |
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