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AndyRoo Member Since: 06 Dec 2023 Location: Gloucester Posts: 512 ![]() ![]() ![]() |
Hi,
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JayGee Member Since: 27 Jul 2021 Location: London Posts: 3028 ![]() ![]() ![]() |
Mine wear pretty evenly front to rear but alignment, bush condition and driving style will influence this and if you are getting uneven wear then it's wise to rotate front to rear. Difference in rolling radius between a new tyre and one that needs changing is (3/4mm for me) is way less than the difference between a 255/55 R20 and 255/50 R20. 2012 TDV8 Vogue (L322) |
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AndyRoo Member Since: 06 Dec 2023 Location: Gloucester Posts: 512 ![]() ![]() ![]() |
Hi,
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kevinp Member Since: 28 Sep 2019 Location: Telford Posts: 1182 ![]() ![]() ![]() |
I bought some secondhand wheels that had 255 55 20 tyres fitted and the steering felt a bit vague and the ride felt to compliant, and they followed grooves and lines in the road. I replaced them with 255 50 20 tyres and the ride just felt tighter and more positive. |
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JayGee Member Since: 27 Jul 2021 Location: London Posts: 3028 ![]() ![]() ![]() |
Same brand and model of tyre? 2012 TDV8 Vogue (L322) |
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rvbush Member Since: 08 Jan 2016 Location: Leamington Spa Posts: 529 ![]() ![]() ![]() |
Going back to my post about transmission wind up and fisha's very comprehensive reply. All diffs are designed to accommodate the slight differences in rotational speed of the wheels when on the road. I would submit that on any ordinary road (not motorway) and in town the wheels are almost constantly all revolving at slightly different speeds (certainly more than 1%), so the diff/diffs is/are pretty much constantly in operation. I fully accept that Torsen (constant torque) diffs work differently, but they must also take into account this constant difference in rotational speed. LSD's are usually set at around 40% slip (some being 25%, but not less for road use), so there is no lock up under normal rotational speed differences.
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pcourtney Member Since: 14 Jan 2020 Location: Stansted Posts: 763 ![]() ![]() ![]() |
That's exactly what I am also hoping for Kevin, good to know ![]() The very latest L322's ( circa 2011/12) were all shod with 255 50 R20's , they must have thought at JLR HQ that this helped with a slightly better driving experience - otherwise why do this ?? |
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JayGee Member Since: 27 Jul 2021 Location: London Posts: 3028 ![]() ![]() ![]() |
The lower the profile the more pronounced any tramlining will be |
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pcourtney Member Since: 14 Jan 2020 Location: Stansted Posts: 763 ![]() ![]() ![]() |
That's interesting, JLR going back to 255 55 R20's |
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Philip Member Since: 05 Jan 2010 Location: UK Posts: 2540 ![]() ![]() |
It will partly depend on keeping the rolling radius similar across all the possible wheel diameters - eg the L405 was available with 19-22 inch wheels. |
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kevinp Member Since: 28 Sep 2019 Location: Telford Posts: 1182 ![]() ![]() ![]() |
I'll say no more but I would have thought the stiffer profile would ride over the lines or grooves in the road rather than a more flexible tyre trying to follow them. |
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JayGee Member Since: 27 Jul 2021 Location: London Posts: 3028 ![]() ![]() ![]() |
The tread partern also makes a difference - were the tyres same brand and model? 2012 TDV8 Vogue (L322) |
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pcourtney Member Since: 14 Jan 2020 Location: Stansted Posts: 763 ![]() ![]() ![]() |
Yes, the tread pattern were all Pirelli Scorpion Zero's
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