are directional tyres ok wrong way round ?

[B'stard Child]

shirt said:

B'stard Child said:

Not sure how to take that............

least I offered experience based advice - still cleaning up the coffee from the snow tyres comment

was tongue in cheek, but the advice given was taken as read. i am leaving them. i couldn't think why they'd be a problem but is good to have it confirmed.

I was using P-Zero Corsas - the Monza was being driven to the tracks too at that time - they were no worse in the wet fitted the wrong way round than they were in the wet fitted the right way round

Note - They were frankly shocking in the wet even fitted correctly

[smugglersvin]

I think if you have them the wrong way round what happens is when you put the car in reverse the car goes forward and when you put the car in first it will go backwards lol.

[2 sMoKiN bArReLs]

G/f had a directional tyre wrong way on her Golf. The vibration & noise was hideous.

[B'stard Child]

2 sMoKiN bArReLs said:

G/f had a directional tyre wrong way on her Golf. The vibration & noise was hideous.

Had it been run the corect way round first?

[2 sMoKiN bArReLs]

B'stard Child said:

2 sMoKiN bArReLs said:

G/f had a directional tyre wrong way on her Golf. The vibration & noise was hideous.

Had it been run the corect way round first?

Nope (I don't think so)

[Noger]

2 sMoKiN bArReLs said:

G/f had a directional tyre wrong way on her Golf. The vibration & noise was hideous.

Front tyres on a heavy (relatively) FWD non track based car isn't *quite* the same thing though. Is it

[2 sMoKiN bArReLs]

Noger said:

2 sMoKiN bArReLs said:

G/f had a directional tyre wrong way on her Golf. The vibration & noise was hideous.

Front tyres on a heavy (relatively) FWD non track based car isn't *quite* the same thing though. Is it

Nope, I was just sharing my only experience of wrongly fitted directionals. T'was a rear though.

[mrmr96]

Noger said:

mrmr96 said:

Utter bks.

They will be fine in the dry.

Should be. Many people run CR500s backward on the front of a Caterham. R888s too. Just hope it doesn't rain

Exactly. Some of the caterham racers seem to think they are actually better reversed(!)

[Noger]

Is how Avon suggest their CR500s are fitted ....

Backwards at the front for RWD.

[EDLT]

E30M3SE said:

My experience is different to yours, a friend bought a car that had a vibration, until the directional tyre were fitted to run in the correct direction........................

Suck it and see OP, report back and let us know.

When they refitted the tyre they would have balanced it, surely?

[E30M3SE]

EDLT said:

E30M3SE said:

My experience is different to yours, a friend bought a car that had a vibration, until the directional tyre were fitted to run in the correct direction........................

Suck it and see OP, report back and let us know.

When they refitted the tyre they would have balanced it, surely?

No, just jacked it up and swapped the wheels.

ETA; FWD hot hatch, front pair were on the wrong way round.

Edited by E30M3SE on Thursday 29th March 22:37

[AllNines]

My experience is that on a RWD car the directionals are backwards on the front wheels. This is how my car was run in competition at world championship level 30 years ago, and how my mechanic fitted them for me last year. All to do with the way the rubber is overlapped where it joins, rather than rain dispersal. Of course, this does not cater for wet weather.
In summary, I think you'll be fine in the dry.

[wiliferus]

Noger said:

Is how Avon suggest their CR500s are fitted ....

Backwards at the front for RWD.

Sorry, I may be being a dimlow - but that looks to me like the n/s/f & o/s/r are set to rotate 'forwards' (in the specified direction) and the o/s/f and n/s/r to run backwards as it were, which from a physics balance POV i can see the logic.

I may of course be reading the diagram completely wrong...

ETA - My reading of the diagram is based on the fact that normally the spec number of the tyre would be on the outside tyre wall, and is thus visible.

Edited by wiliferus on Thursday 29th March 22:46

[Noger]

I know. Had this diagram. And 4 identical tyres and rims in front of me. And still had furrowed brow.

Luckily local tyres place (Big up to Tadworth tyres, who were really good) said " oh yeah , one of them light things is it ?" and just did it. Backwards on the front. More force " backwards " from braking than accelerating. Or something.

[McSam]

Nobody's yet mentioned that directional tyres fitted the wrong way round are not roadworthy and would fail an MOT immediately.

This, I should say, also means your insurance isn't valid.

[Noger]

McSam said:

Nobody's yet mentioned that directional tyres fitted the wrong way round are not roadworthy and would fail an MOT immediately.

This, I should say, also means your insurance isn't valid.

You are wrong on both counts.

[McSam]

Noger said:

You are wrong on both counts.

I've got a fail sheet saying exactly this, so clearly it is a test criterion?

[Paul_M3]

On a track car in the dry there is no reason why you shouldn't run them backwards.

I have done so with Kumho track tyres.

[FamilyDub]

article linked below said:

Directional tyres these tyres must be fitted in accordance with the instructions on the sidewall. The direction of forward rotation is indicated by an arrow, words or both.

http://www.motuk.co.uk/mcmanual_410.htm

[Steameh]

McSam said:

Nobody's yet mentioned that directional tyres fitted the wrong way round are not roadworthy and would fail an MOT immediately.

This, I should say, also means your insurance isn't valid.

I doubt MOT is much of an issue in this case.