Nexen or Kumho tyres?

[ajlsl600]

when i park up , i do slowly,and get lovelly to get out and look!so i dont get the kerb. at times the odd pothole is damn hard to avoid. so i avoid fancy really low profiles i see some look like a thin black band around the rim,not on uk roads today ....

 

[Gazwould]

Wider tyre = more unsprung weight than rim protection!

Always a trade off , got to be lighter than an extra inch of alloy wheel ?

Nothing worse than 9.5 J+ wheels with stretched tyres .

Also the max wider tyre as well as having more lateral grip etc is more progressive and communicative as it moves around more .

 

[LostKiwi]

Also the max wider tyre as well as having more lateral grip etc is more progressive and communicative as it moves around more

This is a fallacy. The width of tyre has virtually no effect on grip.
Your car is held up by air. That is what's in your tyres (or nitrogen if you're fancy). That's measured in psi - pounds per square inch. Therefore for a given pressure there will be a given contact patch. All a wider tyre does is change the shape of the patch not the size of it. In wet weather, snow or on gravel the wider contact patch is more prone to sit on the surface of whatever is covering the road and lose grip. On dry tarmac there may be a small benefit due to less deformation of tread at extremes and slightly sharper turn in due to lower sidewalls but that's all. On rough surfaces the lower profile tyre is less able to deform also compromising grip.

 

[Gazwould]

I don't give a monkeys about the above , lol .

Definitely a personal preference for wider tyres and taller profiles than OE as the next generation models of my cars have.

 

[such]

so would a 255/35/19 be a suitable replacement for a 245/35/19 on the same size rim 8.5J.
the rear tyres are ok, the fronts are prone to getting marked just at the sniff of a pothole!

Would upsizing the fronts and leaving the rears as factory have any unwanted effects?

I've checked here:

Would the speedo be out if the front tyres are changed and would it impact on the esp etc?

 

[LostKiwi]

so would a 255/30/19 be a suitable replacement for a 245/35/19 on the same size rim 8.5J.
the rear tyres are ok, the fronts are prone to getting marked just at the sniff of a pothole!

Would upsizing the fronts and leaving the rears as factory have any unwanted effects?

You need to keep the rolling circumference the same for front and rear. If you increase the rear you must increase the front. If you don't ABS, cruise and ESP will malfunction.

 

[kid-jensen]

Such, according to your chart, the change would mean you would be travelling 1.1% faster for the same indicated speed as before.

No problem at all because the speedo probably under-reads by 5% anyway, so you're improving it's accuracy!

If you're paranoid, or just want to calibrate your speedo, just compare it with the Google-calculated GPS speed and keep that difference in mind when the Bill are following you.

The difference in rolling radius between the narrower size and the wider is 3.5mm, about half the difference between a new tyre and worn-out one.

It would have to be a pretty crappy ABS/ESP system to not be able to accommodate that....

 

[such]

You need to keep the rolling circumference the same for front and rear. If you increase the rear you must increase the front. If you don't ABS, cruise and ESP will malfunction.

I would only increase the front not the rears. If i went for 255/30/19 then the circumference would actually be 58.1mm smaller vs 22mm larger with the 255/35

 

[LostKiwi]

I would only increase the front not the rears. If i went for 255/30/19 then the circumference would actually be 58.1mm smaller vs 22mm larger with the 255/35

Thats around 4% difference. You will almost certainly have issues with cruise, ABS and ESP.
Those systems all measure the speeds of wheel rotation. They expect a certain speed of rotation of one wheel relative to others and when they don't see that will complain. That's why if you increase the front you must increase the rear by the same amount (percentage).

 

[such]

so if i went from 245/35 to 255/35 front, would the rears need to be 275/30 to 285/30?

 

[LostKiwi]

Yes that would probably be ok.

 

[such]

thanks - I'll have a check with my insurer to see what they say.

 

[goldy]

11000 miles and the Kumho tyres are dead. Worn evenly is about all I can say.

 

[Wighty]

11000 miles and the Kumho tyres are dead. Worn evenly is about all I can say.

On the rear I take it ?

 

[RhodieBill]

Nexen.....

 

[alexanderfoti]

On what car?

 

[LostKiwi]

Grip, low cost, long life.
Choose two.

 

[goldy]

On the rear I take it ?

Yes

 

[goldy]

On what car?

E220 estate.
Would've expected a bit more out of them.
Dealer put Davanti on when I got it. Way more life from them

 

[goldy]

Grip, low cost, long life.
Choose two.

They weren't cheap. Wanted uniroyals but they were on back order. Tyre shop assured me I wouldn't be disappointed.
Wouldn't mind, gave the owners daughter free mortgage advice and that's how he repays me!!