Tyre Pressures & Tyre Options - Renault Z.E. Forum
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post #1 of 24 (permalink) Old 03-08-2014, 12:33 PM Thread Starter
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Tyre Pressures & Tyre Options

After wasting time scouring the manual for information on tyre pressures I eventually found in on the edge of the drivers door. 38F 43R - Wow, those are some pressures. But has anyone played around with pressures and come up with better figures.

On the subject of tyres, Leaf and Zoe owners seem to suffer damaged tyres on our wonderful roads - blasted potholes, blasted low profiles, I suppose, or are these low rolling resistance tyres weaker? And apparently expensive, too. One poor Leaf owner wrecked a tyre on the way to work, got a new one fitted during the day and wrecked the new one on the way home.

Just how much difference would it make changing to a more affordable "normal" tyre of correct dimensions?
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post #2 of 24 (permalink) Old 03-08-2014, 12:46 PM
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RE: Tyre Pressures & Tyre Options

Try putting your reg in here and you'll get lots of options, including the "proper" tyres for pretty good prices (I've used these people quite a bit and they've been pretty good - despite appearances, they're mainly a German outfit).

http://www.mytyres.co.uk/index.html

My first thought is to replace like for like on something as specialised as the Fluence ZE. I'm wondering how much of a hit the range would take without low rolling resistance tyres - I don't really have much idea.
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post #3 of 24 (permalink) Old 03-08-2014, 12:53 PM
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RE: Tyre Pressures & Tyre Options

See https://www.renaultzeforum.com/forums...ighlight=tyres

Lower rolling resistance tyres are typically designed to operate at higher pressures, as maintaining the tyre profile without too much deflection is one of the energy saving mechanisms. You can see there is little deflection in the tyres at these pressures. I have tried higher pressures and as you might therefore expect with no detectable improvement. In this case, stick to the door-plate.

Tyres now have to be rated on rolling resistance. You can pick an alternative 'A' class rolling resistance in this tyre and expect no degradation of range with it.
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post #4 of 24 (permalink) Old 03-08-2014, 01:11 PM
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RE: Tyre Pressures & Tyre Options

Quote:
Originally Posted by donald
Tyres now have to be rated on rolling resistance. You can pick an alternative 'A' class rolling resistance in this tyre and expect no degradation of range with it.

I had a quick skim through the 200+ options generated for the Fluence ZE on mytyres.co.uk, and the only one rated A for rolling resistance was this one (Toyo NanoEnergy 2):

http://www.mytyres.co.uk/cgi-bin/rsh...n&typ=R-235617

Most of the western tyre-makers' eco tyres seem to be rated B.
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post #5 of 24 (permalink) Old 03-08-2014, 01:14 PM
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RE: Tyre Pressures & Tyre Options

.... and my original Tyres thread here! nudge nudge,

[url=https://www.renaultzeforum.com/forums/Thread-Tyres?highlight=tyres[/url]

Yep - like ED I can fully recommend mytyres - I have used them for years and while they can take a while to arrive, price and wide selection are top notch. Chris
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post #6 of 24 (permalink) Old 03-08-2014, 01:29 PM
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RE: Tyre Pressures & Tyre Options

Ditto - another code for MyTyres - I used them as a source for scooter tyres as nobody locally kept them in stock. Sure, they ship from Germany, but after 10+ orders, 3 days was the longest I ever had to wait.

Indeed, I think I'll order up a replacement for the Fluence just to keep one handy!
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post #7 of 24 (permalink) Old 03-08-2014, 01:37 PM
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RE: Tyre Pressures & Tyre Options

I don't know if 'Efficient grip' on the car is rated at the top or bottom of the 'B' rolling resistance band. I'm sure you can go for any 'B' band tyre and if there is a difference I'd not expect it to be huge.
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post #8 of 24 (permalink) Old 03-08-2014, 01:50 PM
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RE: Tyre Pressures & Tyre Options

I must admit I was a bit surprised to see the OE tyre is a B for rolling resistance. Without having done too much research, I'd thought they were probably ultra-specialised types optimised for the Fluence/EVs - seems they may be a bit more mainstream than that, so perhaps I'll be a bit less fastidious about doing a precise like for like replacement.
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post #9 of 24 (permalink) Old 03-08-2014, 02:22 PM
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RE: Tyre Pressures & Tyre Options

There's not much in these 'low resistance tyres' murlarky. Always pros and cons with tyres, doubt you'd notice much difference in range in the real world if you compared the best with the worst. Main thing is that a regular tyre shouldn't be inflated to above 36psi. You need a reinforced tyre to use higher pressures and reduce tyre deflection. Low rr tyres are able to take higher pressures without being 'reinforced' in the same sense. So if you do go for a 'regular' tyre, check out that there is plenty of overhead to its max pressure rating.
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post #10 of 24 (permalink) Old 03-08-2014, 03:37 PM
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RE: Tyre Pressures & Tyre Options

To offer a different view point. The Priuschat forum has lots of 'evidence' that LRR tyres make a significant difference to mpg's usually around 5-10%. Not a great difference on a 30 mpg car, but makes a difference when you're trying to e get the best mpg's or the furthest range (for EV's).

I remember I got some non LRR tyres fitted by accident (dealer cocked up) and I couldn't get over 43 mpg average however hard I tried. Upon changing them to LRR, I was able to average low 60's again for the same route. Can I 'prove' this? No. Will I use anything other than LRR now? No. The money saved over a 20,30 or 40k mile lifespan more than makes up for the extra 10 I paid per tyre.

You can also get LRR winter tyres on a B rating. They'd be worth considering.

One thing noted from my Prius experience is that it too needed relatively high tyre pressures of 36/37 psi. Many dealers, tyre dealers or pretty much anybody who got hold of the car would seem to reduce the pressures down to 30 psi, which seriously affected mpg.s Be wary of that with the Fluence too I'm sure.
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