Tyres ?

if the diff was in reasonable condition and viscous coupling okay should make feck all difference-think you have sod all hope of a claim

I thought the reason for new on the back for Freelanders was due to how the VCU works. If the front wheels slip (ie rotate faster) then more force is fed through the VCU to the rear. Now take into account that the newer tyre is larger in diameter and therefore circumference than a worn tyre, it will effectively rotate slower. Putting a new tyre on the front has the rear worn tyre rotating faster and so winding up the VCU..... I think

Personally though I just put 4x Scorpion STR on the car £460 all in. You could do that and sell the old ones

fully understand the sceptism, but we all know there are weaknesses in the drivetrain, so make it easy on your pocket and try to minimise the wear and tear, not increase it, it has to be more reliable,and cheaper on repairs in the long run.

Skynet said:

I thought the reason for new on the back for Freelanders was due to how the VCU works. If the front wheels slip (ie rotate faster) then more force is fed through the VCU to the rear. Now take into account that the newer tyre is larger in diameter and therefore circumference than a worn tyre, it will effectively rotate slower. Putting a new tyre on the front has the rear worn tyre rotating faster and so winding up the VCU..... I think

Personally though I just put 4x Scorpion STR on the car £460 all in. You could do that and sell the old ones

Click to expand...

oh look a flyin pig

Was it something I said

:mooning:

Put new tyres on the front, drove 50 miles to work, spat oil out of diff breather.
Wiped away debris when cool. Drove home, spat more oil out of diff, checked level - topped up.
Checked forum for advice changed new tyres to rear wheels, diff now cooler, handling better.
It may not be very scientific, but it does stop the diff from eating itself.

the crownwheel is supposed to be driven by the pinion, not the pinion by the crownwheel, it is diff. suicide.


They have to work equally well driving both ways. What about the output of the IRD? In this the crown wheel drives the pinion in its prime drive mode. The driver gear changes to driven in both pairs when you lift your foot and over-run.

Due to the weight distribution under driver only loading the rear tyres are rolling at a 3% larger radius than the front all the time (31cm front/32cm rear. sample of two), so that putting new tyres on the rear increases the difference. Putting the new tyres on the front owuld bring them more in line, and I for one would prefer my front wheels not to slip.

It's been said before but lets have one last try.....

To give Freelanders the feeling of driving a front wheel drive LR designers in their wisdom created a drive train that in original condition with all four tyres having the same circumference the rear wheels are under-driven and the VC slips under normal on road driving to accommodate this difference in ratio.

Fitting new tyres, which will have a greater circumference, to the front will increase the difference in ratio making the rears even more under-driven (turning faster compared to fronts). The VC has to slip more to accommodate this greater difference and in doing so does it's job and locks up. As a consequence the transmission winds up and overloads the rear diff and IRD and one or both WILL fail.

As it says in OPs extract "The vehicle manufacturer's recommendations should also be followed."

And here's a pic for the non believers......

so if I understand everything thats been said .......... If I have to fit 2 new tyres, they should be fitted on the rear ??


Chris

c13tay said:

so if I understand everything thats been said .......... If I have to fit 2 new tyres, they should be fitted on the rear ??


Chris

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Yes .

c13tay said:

so if I understand everything thats been said .......... If I have to fit 2 new tyres, they should be fitted on the rear ??


Chris

Click to expand...

Well lets put it another way that you should understand,

the picture of the rear diff is from a Freelander that had new tyres incorrectly fitted to the front 3 days earlier.

only l/r wud come up with such a fecked design

nathan5346 said:

only l/r wud come up with such a fecked design

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Agreed.

I'd be seriously annoyed if I had to do that every time I wanted to change the front tyres. :doh:

doop de dum de doo. . . . . . . . .oh look er nuffer flyin pig

Hi guys,

I'm looking at fitting a full set of all terrain tyres on my 1998 XEDi Free Lander, as well as a set of Sunraysia wheels.

Can anyone recommend Make/Model of tyre that won't F$#K my diff or IRD. The car has allready had the IRD and diff centre replaced back 3 years ago due to the previous owners negligence in tyre choice, and i don't want to make the same mistake. Also are the sunraysia wheels (steel wheels) recommended, and will a 1.5" - 2.0" lift effect any of the drivetrain?

Thanks

head said:

Hi guys,

I'm looking at fitting a full set of all terrain tyres on my 1998 XEDi Free Lander, as well as a set of Sunraysia wheels.

Can anyone recommend Make/Model of tyre that won't F$#K my diff or IRD. The car has allready had the IRD and diff centre replaced back 3 years ago due to the previous owners negligence in tyre choice, and i don't want to make the same mistake. Also are the sunraysia wheels (steel wheels) recommended, and will a 1.5" - 2.0" lift effect any of the drivetrain?

Thanks

Click to expand...

The make / model of tyre won't make any difference. If you are going to fit a set of four new tyres then you will be fine. I fitted an A/T set in April / May time. Tread depth 11mm. My fronts now have 10mm and the rears 11mm (after 4,000 miles). This is keeping my transmission happy.

Just remember the LR manual - 'tyres should be fitted in pairs to the rear axle or both axles at the same time.' I find it much easier on the pocket to replace two tyres instead of four....

I have followed the tyre rule and despite a high mileage am still running on an original VCU. The rear diff (i might add) was wrongly diagnosed as noisy and I replaced it two years ago. The noise turned out to be a worn wheel bearing - damn LR technicians. At least i sourced the diff and fitted myself keeping the bill very low.

Regards,

Steve

Thanks G13SJC. Would anyone know anything about steel wheels (sunraysia) and if a lift kit is safe?

c13tay said:

My freelander is currently fitted with pirelli Scorpion ST's

I have 2 un-repairable punctures.

No one seems to be selling the ST anymore - they are offering me the STR

Will it be ok to fit these ? I would then have different tyres front and rear


Chris

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Maybe a bit late, but Kwikfit are selling Scorpion ST's via their website for £76.64 each including fitting, balancing, etc! I just bought 2 yesterday as I couldn't find anyone else near their price

Careful with changing the tyres of different named models - I had a garage replaced two Michelin Sychrones with Latitudes with the same specs 215/65 r16s, as they said there were a 'direct replacement' but there is 4cm difference between the new and the olds and Michelin say this is within the tolerances accepted within the tyre industry! Its caused damage to my VCU and IRD so make sure they measure the same, don't just go on the spec!

Did they put them on the back or the front?