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owdamer
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PostPosted: 16:47 - 12 Dec 2008    Post subject: car tyres. Reply with quote

Is is best to replace car tyres in pairs, ie front pair & rear pair, or is it ok to just replace one.
My nearside rear needs replacing as its down to the wear indicators and has a slow puncture. I was thinking or replacing both rears with a pair of michelins as thats whats already fitted, but the offside one still has at least 5mm left so i dont really want to bin it. I can't use it as a spare as it has a spacesaver spare as standard....
options.
1. buy one new michelin eco.
2. buy 2 pirelli p6000
3. buy 2 michelin eco.
Suggestions?
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iCraig
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PostPosted: 16:54 - 12 Dec 2008    Post subject: Reply with quote

Hi,

It is FWD or RWD?
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UnknownStuntm...
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PostPosted: 16:56 - 12 Dec 2008    Post subject: Reply with quote

option 2. If you think you'll like them and your car is FWD, put the new ones on the front too. The only time I'd change a single tyre is if I'm selling the car, or I'd just had a new set fitted and promptly (within 500 miles) buggered one.
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owdamer
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PostPosted: 17:03 - 12 Dec 2008    Post subject: Reply with quote

Craig- wrote:
Hi,

It is FWD or RWD?


its fwd. Its a 2.0 focus.
Its got dunlops with about 15,000miles use on the front.
If i'm putting 2 tyres on i'll swap the front and rears round and get the tracking checked/adjusted when they fit the new uns.
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iCraig
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PostPosted: 17:12 - 12 Dec 2008    Post subject: Reply with quote

As its FWD it doesn't matter huge amounts about the rear, you'd get away with replacing only one side.
Although most tyre fitters will say replace both on the same axle, but its not detrimental. If it was your fronts then yes, get both replaced at this time of year.
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Keir
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PostPosted: 18:27 - 12 Dec 2008    Post subject: Reply with quote

come on its a focus..... just replace the 1 tyre and carry on. you will be wasting money buying 2 tyres when its not needed. its hardly a supercar! Laughing
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rotax81
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PostPosted: 18:54 - 12 Dec 2008    Post subject: Reply with quote

Keir_K3 wrote:
come on its a focus..... just replace the 1 tyre and carry on. you will be wasting money buying 2 tyres when its not needed. its hardly a supercar! Laughing


im with him.

you still have 5mm on the other one, a new one will have about 8mm so the 3mm difference is not going to spill your coffee in the drinks holder Wink
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Robby
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PostPosted: 19:20 - 12 Dec 2008    Post subject: Reply with quote

I would also just do the one - but you're definately on the right track with buying decent branded tyres.

My car (smart roadster) currently has 4 budget tyres on it, and 2 were fitted just before I bought it. They're terrible, shit grip in the wet and no feel in the dry. My last smartie had far better grip from its bridgestones, and they were an inch narrower.
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neatbik
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PostPosted: 19:49 - 12 Dec 2008    Post subject: Reply with quote

Agree with robby, 'cheap' tyres arent worth having. They dont grip, and they wear out quick too.
Ive had the Pirelli p6000's on my focus, after they wore out i put some Avons on and they are pretty good, especially in the wet (but its our 'family' car, so i aint saying anymore than that Laughing )
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cagiva gezzer
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PostPosted: 20:16 - 12 Dec 2008    Post subject: Reply with quote

Craig- wrote:
As its FWD it doesn't matter huge amounts about the rear, you'd get away with replacing only one side.
Although most tyre fitters will say replace both on the same axle, but its not detrimental. If it was your fronts then yes, get both replaced at this time of year.


Some would say otherwise.
Quote:

Intuition suggests that since the front tires wore out first and because there is still about half of the tread remaining on the rear tires, the new tires should be installed on the front axle. This will provide more wet and wintry traction; and by the time the front tires have worn out for the second time, the rear tires will be worn out, too. However in this case, intuition isn't right...and following it can be downright dangerous.

When tires are replaced in pairs in situations like these, the new tires should always be installed on the rear axle and the partially worn tires moved to the front. The reason is because new tires on the rear axle help the driver more easily maintain control on wet roads since deeper treaded tires are better at resisting hydroplaning.

Hydroplaning occurs when the tire cannot process enough water through its tread design to maintain effective contact with the road. In moderate to heavy rain, water can pool up in road ruts, depressions and pockets adjacent to pavement expansion joints. At higher speeds, the standing water often found in these pools challenges a tire's ability to resist hydroplaning.

Exactly when hydroplaning occurs is the result of a combination of elements including water depth, vehicle weight and speed, as well as tire size, air pressure, tread design and tread depth. A lightweight vehicle with wide, worn, underinflated tires in a heavy downpour will hydroplane at lower speeds than a heavyweight vehicle equipped with new, narrow, properly inflated tires in drizzling rain.

If the front tires have significantly less tread depth than the rear tires, the front tires will begin to hydroplane and lose traction on wet roads before the rear tires. While this will cause the vehicle to understeer (the vehicle wants to continue driving straight ahead), understeer is relatively easy to control because releasing the gas pedal will slow the vehicle and help the driver maintain control.

However, if the front tires have significantly more tread depth than the rear tires, the rear tires will begin to hydroplane and lose traction on wet roads before the fronts. This will cause the vehicle to oversteer (the vehicle will want to spin). Oversteer is far more difficult to control and in addition to the initial distress felt when the rear of the car starts sliding, quickly releasing the gas pedal in an attempt to slow down may actually make it more difficult for the driver to regain control, possibly causing a complete spinout.

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plugger147
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PostPosted: 20:54 - 12 Dec 2008    Post subject: Reply with quote

I was going to post something similar cagiva gezzer, but if the one tyre is 5mm then just get the one unless you've got one that's pretty shagged on the front then get 2 and put the decent ones on the rear.
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Phil_G
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PostPosted: 00:01 - 13 Dec 2008    Post subject: Reply with quote

Craig- wrote:
As its FWD it doesn't matter huge amounts about the rear, you'd get away with replacing only one side.
Although most tyre fitters will say replace both on the same axle, but its not detrimental. If it was your fronts then yes, get both replaced at this time of year.


apart from the fact that low grip on the rear can lead to oversteer which is a lot harder to correct in front wheel drive.


OP: how close is the other rear tyre to being replaced?
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Dischord
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PostPosted: 00:10 - 13 Dec 2008    Post subject: Reply with quote

swap in pairs and swap front to rear or vice versa every few months or so to get the most out of each tyre.

Goodyear eagle f1 is a fantastic tyre for it's price! Wet roads never bothered me and in the dry it was great.
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Phoenix
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PostPosted: 00:53 - 13 Dec 2008    Post subject: Reply with quote

If both tyres are at about the same wear I'd replace both, but if one still has loads left i'd just replace the one, no matter what axle, unless there was some uneven wear on the other side. It won't make sod all difference, maybe on a Bugatti Veyron it would but not anything else. Certainly would love to see an accident report that stated the cause of the accident to be failure to replace both tyres as a pair, it's just marketing rubbish and tyre companies covering their arses incase anything happens, don't forget to wear your safety glasses this Christmas while cracking walnuts.
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Kickstart
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PostPosted: 13:15 - 13 Dec 2008    Post subject: Reply with quote

Hi

I would be tempted to replace both. But what state is the spare tyre in? Fair chance that someone has but a knackered tyre as the spare and used the decent spare on the car. Might well be worth sticking the half decent rear as the spare.

Or if the spare is half decent then use it to replace the knackered rear tyre.

There should not really be that much difference in wear between the 2 rear tyres, so check there isn't a reason for it (eg, bent rear suspension).

All the best

Keith
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Phoenix
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PostPosted: 14:21 - 13 Dec 2008    Post subject: Reply with quote

His spare is a spacesaver. If for some reason only one tyre was changed at some point, for a puncture/blowout etc then they'll never wear evenly until they're replaced at the same time again which means wasting half a good tyre.

I'm a cheapskate so would just swap the dead one over and leave the half good one where it is, still can't think of a good reason to swap both at the same time, maybe if you're gonna put 2 totally different types of a tyre on like a winter grip tyre and a soft summer tyre is already on the other side, but nobody would do that anyway.
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sickpup
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PostPosted: 14:50 - 13 Dec 2008    Post subject: Reply with quote

Doesn't anyone rotate their tyres these days?
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owdamer
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PostPosted: 15:14 - 13 Dec 2008    Post subject: Reply with quote

Just looking at the MOT history for my car and it shows it failed its first MOT in March last year as the offside front was below the limit and an advisory was issued that the nearside front was close to the limit. Mileage was 26,500 miles.
I'm guessing that the oem tyres were still fitted to the car and that the owner replaced both fronts with the Dunlops it now wears.
I bought the car 12 months later with 36,000 miles on it and its now showing 43,000.
The tyre that is worn has had a slow puncture for quite a while so that has probably accellerated the wear on it.
The car hasn't had any recorded damage and it stops and steers straigh so the only reason i could see for there being such a difference to the wear on the rear tyres is that one has been replaced at some point. I wouldn't be surprised if the one that needs replacing is one of the original tyres that were fitted from new.
I'd ideally like to have 4 matching tyres on it and the easiest way would be to buy a pair of dunlops for the back to match the front, but i've never been a fan of dunlops to be honest. I know its a car and its not really as important as on a bike, but i want good tyres.
Last time i bought tyres for a car it was budget tyres for my mondy and i hated them coz the car never felt stable on fast roads.
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owdamer
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PostPosted: 15:17 - 13 Dec 2008    Post subject: Reply with quote

sickpup wrote:
Doesn't anyone rotate their tyres these days?


Yes. everytime i drive the car all 4 tyres rotate! Very Happy

My mate crashed a car years back and the insurance assessor wrote on his report that the tyres were fitted incorrectly......
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Stelmer
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PostPosted: 15:18 - 13 Dec 2008    Post subject: Reply with quote

The leasing company on my work car will only change a tyre if it's down to 2mm.

Even if one front is 4mm and the other one is 2mm then the 4mm stays on till it gets to 2mm.
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ajb
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PostPosted: 12:15 - 14 Dec 2008    Post subject: Reply with quote

cagiva gezzer wrote:
Craig- wrote:
As its FWD it doesn't matter huge amounts about the rear, you'd get away with replacing only one side.
Although most tyre fitters will say replace both on the same axle, but its not detrimental. If it was your fronts then yes, get both replaced at this time of year.


Some would say otherwise.
Quote:

Intuition suggests that since the front tires wore out first and because there is still about half of the tread remaining on the rear tires, the new tires should be installed on the front axle. This will provide more wet and wintry traction; and by the time the front tires have worn out for the second time, the rear tires will be worn out, too. However in this case, intuition isn't right...and following it can be downright dangerous.

When tires are replaced in pairs in situations like these, the new tires should always be installed on the rear axle and the partially worn tires moved to the front. The reason is because new tires on the rear axle help the driver more easily maintain control on wet roads since deeper treaded tires are better at resisting hydroplaning.

Hydroplaning occurs when the tire cannot process enough water through its tread design to maintain effective contact with the road. In moderate to heavy rain, water can pool up in road ruts, depressions and pockets adjacent to pavement expansion joints. At higher speeds, the standing water often found in these pools challenges a tire's ability to resist hydroplaning.

Exactly when hydroplaning occurs is the result of a combination of elements including water depth, vehicle weight and speed, as well as tire size, air pressure, tread design and tread depth. A lightweight vehicle with wide, worn, underinflated tires in a heavy downpour will hydroplane at lower speeds than a heavyweight vehicle equipped with new, narrow, properly inflated tires in drizzling rain.

If the front tires have significantly less tread depth than the rear tires, the front tires will begin to hydroplane and lose traction on wet roads before the rear tires. While this will cause the vehicle to understeer (the vehicle wants to continue driving straight ahead), understeer is relatively easy to control because releasing the gas pedal will slow the vehicle and help the driver maintain control.

However, if the front tires have significantly more tread depth than the rear tires, the rear tires will begin to hydroplane and lose traction on wet roads before the fronts. This will cause the vehicle to oversteer (the vehicle will want to spin). Oversteer is far more difficult to control and in addition to the initial distress felt when the rear of the car starts sliding, quickly releasing the gas pedal in an attempt to slow down may actually make it more difficult for the driver to regain control, possibly causing a complete spinout.


"tires" and "gas pedal", it's an American article, undoubtedly refering to RWD cars.
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owdamer
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PostPosted: 12:38 - 14 Dec 2008    Post subject: Reply with quote

sickpup wrote:
Doesn't anyone rotate their tyres these days?


Just looked this up on the kwikfit website.

Quote:
Tyre rotation

Many tyre manufacturers agree that it is no longer good practice to rotate your tyres in order to extend their legal life. The reasons for this are;

Partly worn tyres are more likely to experience punctures – particularly in wet weather conditions.
Front tyre deflation will create an under-steer effect which is easier to control than over-steer (the effect produced by a rear tyre deflation)
In the unlikely event that a tyre deflates suddenly, then it is easier to control the vehicle if this occurs at the front of the vehicle. For improved handling and stability it is now recommended that the ‘best’ tyres should always be fitted at the rear of the vehicle. This is irrespective of whether the car is front or rear wheel drive.

Because of this at Kwik Fit we do not recommend tyre rotation and we do recommend fitting your best tyres at the rear of the vehicle. If you are replacing a single tyre then this should be paired with the rear with the tyre having the most tread depth. There are some circumstances when this advice does not apply, such as;
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1016
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PostPosted: 12:53 - 14 Dec 2008    Post subject: Reply with quote

beat me to it ajb!
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owdamer
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PostPosted: 13:08 - 14 Dec 2008    Post subject: Reply with quote

1016 wrote:
beat me to it ajb!


The kwikfit site gives the same advice though. The best tyres should be on the rear.
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sickpup
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PostPosted: 14:56 - 14 Dec 2008    Post subject: Reply with quote

Quote:
Tyre rotation

Many tyre manufacturers agree that it is no longer good practice to rotate your tyres in order to extend their legal life. The reasons for this are;

Partly worn tyres are more likely to experience punctures – particularly in wet weather conditions.
Front tyre deflation will create an under-steer effect which is easier to control than over-steer (the effect produced by a rear tyre deflation)
In the unlikely event that a tyre deflates suddenly, then it is easier to control the vehicle if this occurs at the front of the vehicle. For improved handling and stability it is now recommended that the ‘best’ tyres should always be fitted at the rear of the vehicle. This is irrespective of whether the car is front or rear wheel drive.

Because of this at Kwik Fit we do not recommend tyre rotation and we do recommend fitting your best tyres at the rear of the vehicle. If you are replacing a single tyre then this should be paired with the rear with the tyre having the most tread depth. There are some circumstances when this advice does not apply, such as;


That makes no sense. Confused and doesn't apply to 4x4's.
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