Dunlop Sportmax tyres cracking
Re: Dunlop Sportmax tyres cracking
The Ackermann angle is part of the car's steering designed in by the maker and not an adjustable for the car in normal use as is tracking. Cracking on the sidewalls is common on tyres over 3 years old. All tyres need regular checks the same as oil, coolant etc. Not doing so and allowing them to run under the designed pressure will enhance wear in the treads and carcass of the tyres.
Re: Dunlop Sportmax tyres cracking
Vespa wrote: ↑Fri Jul 03, 2020 9:59 amThe Ackermann angle is part of the car's steering designed in by the maker and not an adjustable for the car in normal use as is tracking. Cracking on the sidewalls is common on tyres over 3 years old. All tyres need regular checks the same as oil, coolant etc. Not doing so and allowing them to run under the designed pressure will enhance wear in the treads and carcass of the tyres.
Here is a video explaining the Ackerman Steering. Just as an aside the guy has some excellent YouTube videos on a range of automotive subjects. As a retired engineer I found his videos on variable valve timing and lift quite interesting. Sad but true.
Richard Green
I know what's wrong and if I could find it I'd fix it.
2016 XE R-Sport - HJ16XES (Cat); 2004 XKR convertible - RG04XKR (Animal); 1975 Triumph TR6 - HPR30N (Rob)
I know what's wrong and if I could find it I'd fix it.
2016 XE R-Sport - HJ16XES (Cat); 2004 XKR convertible - RG04XKR (Animal); 1975 Triumph TR6 - HPR30N (Rob)
- 147daytona
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Re: Dunlop Sportmax tyres cracking
Just before I traded my 240 in it had it's 1st MOT and I got an advisory for all 4 of the original 19" Dunlop Sportmax tyres and they had only covered 14k miles in those 3 years so had plenty of tread left on them.
I'd never had tyres of any make crack on any car I've owned over the last 40 years until these Dunlops!
At least Jaguar had to replace them at their expense before selling the car on (well at least I hope they did).
I'd never had tyres of any make crack on any car I've owned over the last 40 years until these Dunlops!
At least Jaguar had to replace them at their expense before selling the car on (well at least I hope they did).
MY20 Carpathian Grey 300 R-Dynamic HSE AWD + loads of extras!
Previous, MY17 Italian Racing Red 240 R-Sport
Previous, MY17 Italian Racing Red 240 R-Sport
Re: Dunlop Sportmax tyres cracking
There used to be something where tyres had manufacturers guarantee for 5 years against this sort of thing. However, the date stamp on the tyre can be a few years earlier than when fitted and fast fit outlets aren't interested in the bother of claiming. Had problems with Goodyear tyres on our Alfa, which seemed to be the ones manufatured in China whereas the German produced ones were OK. But this was wavy tread from carcass failure, rather than cracking
R-Sport 200ps Ammonite grey, parking pack, split fold rear seats, space saver, 14 way seats
Re: Dunlop Sportmax tyres cracking
Just to add, tyres are more likely to develop cracking if the car stands unused for long periods. The plasticisers start to separate from the compound due to lack of movement.
S 380, ICT Pro, resale grey. Fun and comfy!
Re: Dunlop Sportmax tyres cracking
Mine have been cracking for at least 2 years. Despite still having plenty of tread, I had them changed to Michelin PS4s yesterday - for £674. I’ve only driven a few miles with them, since fitting, but immediately noticed that the car is much quieter.
XES 3.0L V6. Glacier White. Panoramic sun roof.
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Re: Dunlop Sportmax tyres cracking
New tyres will always sound quieter because they are more flexible when new and the rigidity that builds up with ageing enhances the noise. Tread depth of just a couple of mm can also make a difference to noise levels. You will not notice the noise increasing with age until you next renew the tyres. Then once again the new tyres will sound quieter. Tread pattern can also be an issue.
R Sport 180D 2015
Re: Dunlop Sportmax tyres cracking
Just had a full set of Uniroyal Rainsport 5s fitted to my newly powder-coated wheels in place of the old Dunlops. A marked improvement in ride, handling and road noise. Well pleased, if a little paranoid about kerbs now!



MY16 180D Porfolio in Firenze.