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Wheels/Tire combo question

Specific discussion about the E89 2009 Z4 (sDrive35is, sDrive35i, sDrive30i, sDrive23i)
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techathy
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Wheels/Tire combo question

Post by techathy » Thu Dec 21, 2017 8:21 pm

Widest 35 profile tyre in ETRTO specs for a 9j. In terms of looking oversized on the width, if you've not got rim protection on the tyre it can do. No pictures, but will try to remember to take some over the hols.
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Wheels/Tire combo question

Post by mr wilks » Thu Dec 21, 2017 8:31 pm

techathy wrote: Thu Dec 21, 2017 8:21 pm Widest 35 profile tyre in ETRTO specs for a 9j. In terms of looking oversized on the width, if you've not got rim protection on the tyre it can do. No pictures, but will try to remember to take some over the hols.
Any particular reason why you went 275 35 instead of 255 40 ?
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Wheels/Tire combo question

Post by techathy » Thu Dec 21, 2017 8:34 pm

Visual balance with the front tyre width plus my car is pushing to 535Nm at the wheels.
Current: '09 Lotus Evora Launch Edition
Previous: '13 BMW 120dx, '15 BMW z4 35iS

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Wheels/Tire combo question

Post by mr wilks » Thu Dec 21, 2017 8:39 pm

techathy wrote: Thu Dec 21, 2017 8:34 pm Visual balance with the front tyre width plus my car is pushing to 535Nm at the wheels.
So chosen simply for wanting most amount of rubber on tarmac ? how much does 535nm convert to BHP :?
3 ZMRs
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997 C4
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F82 M4
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Wheels/Tire combo question

Post by techathy » Thu Dec 21, 2017 8:51 pm

245 at the front & 255 at the rear looked odd given the style of the rims (See photo thread, with 265/35s on the rear)
Current: '09 Lotus Evora Launch Edition
Previous: '13 BMW 120dx, '15 BMW z4 35iS

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Wheels/Tire combo question

Post by mr wilks » Thu Dec 21, 2017 9:03 pm

techathy wrote: Thu Dec 21, 2017 8:34 pm Visual balance with the front tyre width plus my car is pushing to 535Nm at the wheels.
That aint that crazy to need supersize rubber :?
my 35i is mapped & is driven spiritedly in all weathers on 255 rears with no troubles as yet :driving: i haven't got any print out for it for exact numbers but for comparison my son recently had his modified Golf Mk5 Ed 30 rolling roaded , it produced 364 hp / 376ft lbs / 510nm & he's on fwd with standard wheels on 235 40s :P

How are you finding the Uni Rs3 work with the car ?
3 ZMRs
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5 Si coupes
5 Si roadsters
997 C4
TTRS
F82 M4
MK7 Golf Gti
current Bmw 6 Gran Turismo

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Wheels/Tire combo question

Post by Busterboo » Thu Dec 21, 2017 9:26 pm

mr wilks wrote: Thu Dec 21, 2017 4:02 pm ... Where did I say on Oe 18inch runflats the E89 rides badly ? :?
You didn't. I know they do.
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Wheels/Tire combo question

Post by mr wilks » Thu Dec 21, 2017 9:40 pm

Busterboo wrote: Thu Dec 21, 2017 9:26 pm
mr wilks wrote: Thu Dec 21, 2017 4:02 pm ... Where did I say on Oe 18inch runflats the E89 rides badly ? :?
You didn't. I know they do.
They didn't feel bad in comfort terms when i had them on my first E89 (23i) they just show their deficiency when trying to enjoy a more spirited drive :driving: when they hit anything other than smooth tarmac :cry: that unnervving skittishness leaves them intolerable for me .
Here's one for you to ponder over & may help you accept you are never going to be able to prove your theory right or wrong :wink:

3 E89,s all same spec

1 has 18inch non runflats & covers 6000 miles pa
2 has 19inch non runflats & covers 4000 miles pa
3 has 19inch runflats & covers 3000 miles pa


which one will get a split wheel first ?
3 ZMRs
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997 C4
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Wheels/Tire combo question

Post by techathy » Thu Dec 21, 2017 9:46 pm

mr wilks wrote: Thu Dec 21, 2017 9:03 pm That aint that crazy to need supersize rubber :?
No, for general driving it's not an issue but 275s help going across non-perpendicular badly made/placed road surface joints at high throttle openings. With the tyre pressures being the same, the contact patch will be a very similar size.
mr wilks wrote: Thu Dec 21, 2017 9:03 pmHow are you finding the Uni Rs3 work with the car ?
Well, they lasted just under 14k miles before they reached 3.5mm of tread then I got a nasty sidewall laceration. The only reason I went to the PS4s this time is because they stocked the PS4 in the sizes I wanted.
Current: '09 Lotus Evora Launch Edition
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Wheels/Tire combo question

Post by techathy » Thu Dec 21, 2017 9:50 pm

mr wilks wrote: Thu Dec 21, 2017 9:40 pm1 has 18inch non runflats & covers 6000 miles pa
2 has 19inch non runflats & covers 4000 miles pa
3 has 19inch runflats & covers 3000 miles pa


which one will get a split wheel first ?
The one with the weakest wheel design.
Current: '09 Lotus Evora Launch Edition
Previous: '13 BMW 120dx, '15 BMW z4 35iS

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Wheels/Tire combo question

Post by mr wilks » Thu Dec 21, 2017 9:51 pm

techathy wrote: Thu Dec 21, 2017 9:46 pm
mr wilks wrote: Thu Dec 21, 2017 9:03 pm That aint that crazy to need supersize rubber :?
No but it helps going across non-perpendicular badly made/placed road surface joints.
mr wilks wrote: Thu Dec 21, 2017 9:03 pmHow are you finding the Uni Rs3 work with the car ?
Well, they lasted just under 14k miles before they reached 3.5mm of tread then I got a nasty sidewall laceration. The only reason I went to the PS4s this time is because they stocked the PS4 in the sizes I wanted.
I don't think the Ps4 has a direct competitor right now , its clearly the tyre of the moment but then it is the most expensive so high end performance should be a given .
I only tried Uni Rs3s on the 35i for a short time before i sold the wheelset but they certainly didn't disappoint me in terms of traction / grip .
Id fit again but then i don't do daily drive miles so longevity isn't a criteria for me .
Keep us posted on the Ps4s , especially if you are doing big miles on them
3 ZMRs
3 E89s
5 Si coupes
5 Si roadsters
997 C4
TTRS
F82 M4
MK7 Golf Gti
current Bmw 6 Gran Turismo

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Wheels/Tire combo question

Post by mr wilks » Thu Dec 21, 2017 9:52 pm

techathy wrote: Thu Dec 21, 2017 9:50 pm
mr wilks wrote: Thu Dec 21, 2017 9:40 pm1 has 18inch non runflats & covers 6000 miles pa
2 has 19inch non runflats & covers 4000 miles pa
3 has 19inch runflats & covers 3000 miles pa


which one will get a split wheel first ?
The one with the weakest wheel design.
:P
3 ZMRs
3 E89s
5 Si coupes
5 Si roadsters
997 C4
TTRS
F82 M4
MK7 Golf Gti
current Bmw 6 Gran Turismo

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techathy
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Wheels/Tire combo question

Post by techathy » Thu Dec 21, 2017 10:00 pm

mr wilks wrote: Thu Dec 21, 2017 9:51 pmI don't think the Ps4 has a direct competitor right now , its clearly the tyre of the moment but then it is the most expensive so high end performance should be a given .
Hu? The PS4s were mid-pack for pricing when I got my new tyre set.
Current: '09 Lotus Evora Launch Edition
Previous: '13 BMW 120dx, '15 BMW z4 35iS

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Wheels/Tire combo question

Post by mr wilks » Thu Dec 21, 2017 10:47 pm

techathy wrote: Thu Dec 21, 2017 10:00 pm
mr wilks wrote: Thu Dec 21, 2017 9:51 pmI don't think the Ps4 has a direct competitor right now , its clearly the tyre of the moment but then it is the most expensive so high end performance should be a given .
Hu? The PS4s were mid-pack for pricing when I got my new tyre set.
I only look at 19s & last time i did were dearer than the others i would consider buying ( Vred / Conti / Hankook) :?
3 ZMRs
3 E89s
5 Si coupes
5 Si roadsters
997 C4
TTRS
F82 M4
MK7 Golf Gti
current Bmw 6 Gran Turismo

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Wheels/Tire combo question

Post by Busterboo » Fri Dec 22, 2017 1:00 am

mr wilks wrote: Thu Dec 21, 2017 9:40 pm
Busterboo wrote: Thu Dec 21, 2017 9:26 pm
mr wilks wrote: Thu Dec 21, 2017 4:02 pm ... Where did I say on Oe 18inch runflats the E89 rides badly ? :?
You didn't. I know they do.
They didn't feel bad in comfort terms when i had them on my first E89 (23i) they just show their deficiency when trying to enjoy a more spirited drive :driving: when they hit anything other than smooth tarmac :cry: that unnervving skittishness leaves them intolerable for me .
Here's one for you to ponder over & may help you accept you are never going to be able to prove your theory right or wrong :wink:

3 E89,s all same spec

1 has 18inch non runflats & covers 6000 miles pa
2 has 19inch non runflats & covers 4000 miles pa
3 has 19inch runflats & covers 3000 miles pa


which one will get a split wheel first ?
I don't know. I do know that my 18" 'normal' tyres have done 16,000 miles in the last year (not commuting miles - I drive the car for fun) and ...

1 they drive much, much better than runflats and ...
2 at 37,000 miles to date, the wheels ain't cracked (which, in Leicester, is remarkable).

However, as you say, perhaps they look like saloon wheels & tyres.

In an ideal world, I'd like 19s with non-runflat tyres that drove as well as 18s on non-runflats, but, since you say they drive only as well as 18s on runflats, I have no choice.
Vidi, vici, veni

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