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Discussion Starter #1
Hello,
Hoping for some advice.

Had some new tyres fitted a week ago whilst I was on holiday after an MOT and Service. My dad took the car to the garage (not a Toyota Dealer), had the tyres fitted and all seemed well. Driving to work this morning down the A421 and M1 and noticed the car is weaving at speeds of 65+. It's just enough that at times it can feel alarming.

Could it be something as simple as a wheel weight or not balanced properly? Or should I be more concerned?

Any advice is really appreciated.

Thanks

Sam
 

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What tyres were fitted and is it all 4 new or just a couple?

First off if only some were replaced make sure it's the same tyres on the same axle, check tyre pressures to make sure they are all the same. I would jack each corner up , give the wheels a wobble by hand to see if they were tight enough, undo each wheel then re-seat and re-tighten. Unbalanced wheels are usually a vibration rather than a weave. How many miles have the new tyres done now?
 

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Discussion Starter #3
Back tyres replaced, with the same stock tyres (Michelin Primacy?)
Tyre pressures were checked this morning, what should they be?
New tyres have done about 80 miles now.
 

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1) drive in nearest fuel station and check air pressures in all four of tires.
2) were tires mounted with balancing, or without?
3) were really both tires per axle changed or some weirdness, like per side?
4) have you checked if all tires are right way mounted on wheels rotational wise? Check markings on tire sides.
5) were lugnuts retightened after a while driving? You should have stock wrench in foam in boot.

1/4/5 is easy to check yourself & fix if needed.
 

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Yea make sure tyre pressures are at least 36 all round (when cold). It seems to be very sensitive to them being too low. Even a couple of PSI has a noticeable effect.
 

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Over inflate them by 1psi which will then increase with heat, really? Sounds like over inflation to me. Why do you recommend higher? (Going by what others have said mfg. States 35 cold.)
 

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surely it should be the other way round to fight understeer? Unless I'm drastically missing something.

lower tyre pressure means more of the tyre in contact with the road therefore increasing grip


running the rears at a lower PSI means that they'll be more grippy causing the front to slip first?


like I said its entirely possible I've misunderstood something but thats how I've always understood it?
 

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To me it also was this way, to lower pressure at end where i want to add grip. Now i get wished handling bias balance with alignment, so running same pressure on all corners.
 

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ealing86 said:
running the rears at a lower PSI means that they'll be more grippy causing the front to slip first?

Not the way it feels to me. At the very least, lower pressures make the breakaway more progressive; I believe the breakaway occurs earlier too.


I run the fronts at a 'high 35', meaning I have about 10% more in the fronts, which if you have regard to the weight distribution, means the pressures match the static load.


None of which helps withthe OP'sproblem...

Edited by: Tony H
 

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Discussion Starter #13
So I went for a second opinion on the balancing and the rears were WAY off... had them rebalanced but the car is still weaving. I've noticed that it is pulling to the left too. Car is booked in tomorrow so hopefull;y they'll sort it!
 

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imoBalancing of wheels shouldn't effect the vehicle weaving on a main road, neither should tyre pressures that much, They may both cause other issues but not weaving in a straight line (unless the tyre is flat). All cars are sensitive to changes but the GT86 i wouldn't say is that unique.


Most if not all tyres have a film from new as part of the normal manufacturing process that goes after 500miles for example and grip is improved, so it could be this (but unlikely).


However a couple of things that others may not have mentioned:
1: Has anyone taken it out for a jolly and hit a kerb while you were on holiday? As it sounds like toe has somehow gone out?
2: Do the tyres have any production dates on them? are the years of production very different?
3: Are they all the same load rating? This is the number after 215/45R17 it is either W87 or Y91 i think and they should be all the same. This can cause weird issues with driving including weaving and pulling.


The only other issue to look at is whether something is loose?


Sweeping statement coming up about your post above: Some garages will say the last place you took it to hasn't done a good job, its part of the industry rule to undermine other garages in an attempt to gain trust and repeat business (If you second opinion was a different place), sometimes its justified sometimes its not. If the balancing was way off it would have likely vibrated the chassis possibly through the seat as its rear tyres and this would have been felt at speed. Also it hasn't cured the weaving (naturally) so was it way out?


I hope you get it sorted as their is nothing worse than lack of confidence in the car on public roads.










Edited by: EB2429
 

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It sounds as though a full alignment check at a specialist place is called for.

Did you leave the car at either place where the tyres/wheels were dealt with? If so did someone decide it needed a 'Test' run? I always note the mileage when handing over for work and tell them as well.
 

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Discussion Starter #17
Thanks for all the replies!
1: Has anyone taken it out for a jolly and hit a kerb while you were on holiday? As it sounds like toe has somehow gone out?

I had the car serviced first, then the tyres changed a few days later by my father whilst I was on holiday. The car wasn't weaving until the tyres were changed. It's unlikely my father hit a curb, but you never know. It wasn't taken for a jolly by the garage as it's a family friend that owns it.

2: Do the tyres have any production dates on them? are the years of production very different?

I'll check this tonight, where do I look?

3: Are they all the same load rating? This is the number after 215/45R17 it is either 88 or 92 they should be all the same. This can cause weird issues with driving including weaving and pulling.

I'll have a look when I get out of work!

Sweeping statement coming up about your post above: Some garages will say the last place you took it to hasn't done a good job, its part of the industry rule to undermine other garages in an attempt to gain trust and repeat business (If you second opinion was a different place), sometimes its justified sometimes its not. If the balancing was way off it would have likely vibrated the chassis possibly through the seat as its rear tyres and this would have been felt at speed. Also it hasn't cured the weaving (naturally) so was it way out?

In regards to this, I was stood with the bloke whilst he balanced the wheels on the spinning machine, unless he could change the calibration of the measurement device, then I doubt he could have made it up.


Trying to avoid taking it to Fensport all the way in Peterborough to get it dealt with.....
 

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Sounds fair enough about the garage, i'm just very cynical in general as I deal with garages all day long


If you googletyre production date it shows some pics which is better than me trying to explain it as the pictures really help. but of all the 3 options i think its the least likely as it should make the least impact on the performance of the car, (but its not impossible).


The load rating is a good one as this can and does have an effect on the car, It should be W87 or Y91 i think (i'm only suggesting these as you have worked your way through the many other options already put forward by others)


If its that bad, do be careful how much you drive it though
 

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Thanks for all the replies!
1: Has anyone taken it out for a jolly and hit a kerb while you were on holiday? As it sounds like toe has somehow gone out?

I had the car serviced first, then the tyres changed a few days later by my father whilst I was on holiday. The car wasn't weaving until the tyres were changed. It's unlikely my father hit a curb, but you never know. It wasn't taken for a jolly by the garage as it's a family friend that owns it.

2: Do the tyres have any production dates on them? are the years of production very different?

I'll check this tonight, where do I look?

3: Are they all the same load rating? This is the number after 215/45R17 it is either 88 or 92 they should be all the same. This can cause weird issues with driving including weaving and pulling.

I'll have a look when I get out of work!

Sweeping statement coming up about your post above: Some garages will say the last place you took it to hasn't done a good job, its part of the industry rule to undermine other garages in an attempt to gain trust and repeat business (If you second opinion was a different place), sometimes its justified sometimes its not. If the balancing was way off it would have likely vibrated the chassis possibly through the seat as its rear tyres and this would have been felt at speed. Also it hasn't cured the weaving (naturally) so was it way out?

In regards to this, I was stood with the bloke whilst he balanced the wheels on the spinning machine, unless he could change the calibration of the measurement device, then I doubt he could have made it up.


Trying to avoid taking it to Fensport all the way in Peterborough to get it dealt with.....
What happened in the end with this mate? I just started a thread for the same problem - floaty, weaving feeling over 60mph after rear tyre change. Some good ideas to check in here, like the load rating - hadn't thought of that. There's also a chance I've bumped a kerb and thrown something out (think I've done it twice in the 2 years since I've had the car...still unforgivable), and I've only just noticed for some reason.
 
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