Wheel Sizes

Alloy wheels and tyre discussion
Silverstar
Member
Member
Posts: 236
Joined: Fri Jun 21, 2019 10:06 am

Wheel Sizes

Post by Silverstar » Tue Oct 08, 2019 8:52 am

Just come across an interesting video about wheel sizes in relation to performance. I was thinking to go to 19” but I think now I will stick with my 18s

https://youtu.be/mPyg3ilw3KU
2009 sdrive30i auto Sapphire Black / Coral Red

User avatar
Pbondar
Senior Member
Senior Member
Posts: 1003
Joined: Thu Feb 23, 2017 10:37 am
Location: Scottish Borders

Wheel Sizes

Post by Pbondar » Tue Oct 08, 2019 10:55 am

Silverstar wrote:
Tue Oct 08, 2019 8:52 am
Just come across an interesting video about wheel sizes in relation to performance. I was thinking to go to 19” but I think now I will stick with my 18s

https://youtu.be/mPyg3ilw3KU
Its an interesting one, in the same series they do one on varying tyre widths and asymmetric vs square tyre set ups..

I haven't been able to do a pure back to back on 17/18/19 but on 17/18 with near identical tyres there seems to be no advantage on the road of 18 over 17..and the 17s ride so much better..

My experience with 19s was limiited and not relevant due to run flats but they were appalling in all aspects compared to the 17s.

Interesting was that even 'shite' chinese rubber on 17s wasn't as bad as I expected which were on the 17s I inherited before puttting premium rubber on..that is in the dry..slightly more amsuing when wet..
2012 E89 20i MSport Auto Atacama Yellow, Fully loaded in its day.. Changes (Re-map/Wheels/Tyres/Spoiler/Steering Wheel/Shock Absorbers/ARB/Rear Diffuser/Brakes/Speakers/Amps/ASD delete) Upcoming changes (Quaife LSD) Full Whippy here!

Image

Silverstar
Member
Member
Posts: 236
Joined: Fri Jun 21, 2019 10:06 am

Wheel Sizes

Post by Silverstar » Tue Oct 08, 2019 3:58 pm

So the 17s would be best for road driving, except the really do look too small LOL. I know many here say even the 18s look too small on the Z but I think I will stick with the 18s, with normal tyres (non run flats) the car rides and handles just fine. Also I've only just recently spent 400 odd quid on the tyres :lol: Pbondar so are you still on 17s?
2009 sdrive30i auto Sapphire Black / Coral Red

Lazza
Member
Member
Posts: 407
Joined: Sat Nov 11, 2017 10:42 am
Location: Wokingham

Wheel Sizes

Post by Lazza » Tue Oct 08, 2019 4:58 pm

Bigger wheels has only ever been about looks.
Z4 S-Drive 35i
Audi TT S-line
Mazda MX5 Mk2.5 (for sale)
Wokingham Berkshire

User avatar
Pbondar
Senior Member
Senior Member
Posts: 1003
Joined: Thu Feb 23, 2017 10:37 am
Location: Scottish Borders

Wheel Sizes

Post by Pbondar » Tue Oct 08, 2019 7:47 pm

Silverstar wrote:
Tue Oct 08, 2019 3:58 pm
So the 17s would be best for road driving, except the really do look too small LOL. I know many here say even the 18s look too small on the Z but I think I will stick with the 18s, with normal tyres (non run flats) the car rides and handles just fine. Also I've only just recently spent 400 odd quid on the tyres :lol: Pbondar so are you still on 17s?

I have three sets..

one set of BMW 103 daisy 17" with continental winter tyres that sadly don't fit over my 330mm 28i front discs now

I have a set of 17" team dynamics imola assymetric with conti sport contact 5

I have a set of 18" Zito 935s assymetric with conti sport contact 5 plus

Just wondering what to do next as the need for winter set has gone away with work /travel requirements?
2012 E89 20i MSport Auto Atacama Yellow, Fully loaded in its day.. Changes (Re-map/Wheels/Tyres/Spoiler/Steering Wheel/Shock Absorbers/ARB/Rear Diffuser/Brakes/Speakers/Amps/ASD delete) Upcoming changes (Quaife LSD) Full Whippy here!

Image

Mr Tidy
Lifer
Lifer
Posts: 10633
Joined: Wed Jul 02, 2014 12:18 pm
Location: Berkshire

Wheel Sizes

Post by Mr Tidy » Tue Oct 08, 2019 11:22 pm

Well given the time of year and your location this might be a good time to sell your winters on here!

And you might as well sell your other 17s if they will no longer fit your car. :lol:

Then you'll have a few quid in case you see a set you like. :thumbsup:
Z4 3.0Si Sport - Coupe for added stiffness!
Current - Montego Blue, Pearl Grey, Cirrus trim & 295s. Cruise, Storage and pdc. E90 330i as a DD.
Gone - Ruby Black, Pearl Grey & 135Ms. Xenons, heated seats and Professional speakers.

Online
User avatar
mr wilks
Lifer
Lifer
Posts: 19930
Joined: Wed Jul 04, 2012 10:02 pm
Location: Lancs or Normandy , i don't mind which

Wheel Sizes

Post by mr wilks » Wed Oct 09, 2019 7:30 pm

Enjoyable clip Silverstar but not sure how you reached the conclusion to stick with 18s over 19s :? Unless i missed something defining there was no outright winner in any of the 3 sizes to warrant someone changing from 19s to 18s or 17s to 19s :?
In the guys summary he mirrors my own thoughts on the subject in that the end user will find more noticeable difference between tyre brands / specs than he would from changing between sizes 17 - 18 -19 but using the same brand tyre .
In short if you choose the right size rubber & right brand manufacturer you can enjoy a 19inch wheel on any Z4 without compromising in any department .
In all the tests in the above clip the actual margins were down to a second & that was thrashing a hot hatch around a track .
Lastly as with most tyre reviews , they would be far more relevant if carried out on the same vehicle you were intending to fit the tyres to as a fwd turbo charged hot hatch is unlikely to handle anything like a rwd 2 seater na E89 E85 E86
Ultimately its down to personal preference which size wheels & which brand tyres the end user prefers :driving: in the end that's what really matters :thumbsup:
Previous Zs :roll:
E86
E85
///MR
Si E85
E89 23i
Si E85
E86
3.0Si E85
///MR
35i Msport 6spd
E86
///MR
E86
35is

911 997 Carrera4


Image

https://www.instagram.com/andy911wheels/

Silverstar
Member
Member
Posts: 236
Joined: Fri Jun 21, 2019 10:06 am

Wheel Sizes

Post by Silverstar » Thu Oct 10, 2019 9:19 pm

mr wilks wrote:
Wed Oct 09, 2019 7:30 pm
Enjoyable clip Silverstar but not sure how you reached the conclusion to stick with 18s over 19s :? Unless i missed something defining there was no outright winner in any of the 3 sizes to warrant someone changing from 19s to 18s or 17s to 19s :?
In the guys summary he mirrors my own thoughts on the subject in that the end user will find more noticeable difference between tyre brands / specs than he would from changing between sizes 17 - 18 -19 but using the same brand tyre .
In short if you choose the right size rubber & right brand manufacturer you can enjoy a 19inch wheel on any Z4 without compromising in any department .
In all the tests in the above clip the actual margins were down to a second & that was thrashing a hot hatch around a track .
Lastly as with most tyre reviews , they would be far more relevant if carried out on the same vehicle you were intending to fit the tyres to as a fwd turbo charged hot hatch is unlikely to handle anything like a rwd 2 seater na E89 E85 E86
Ultimately its down to personal preference which size wheels & which brand tyres the end user prefers :driving: in the end that's what really matters :thumbsup:
I've got 18" with Goodyear F1 Asymetric 3 on and am happy with the ride comfort / noise and handling they give. I was thinking at some point in the future to change up to 19"s for the looks! (when my new tyres have worn out lol!) but I don't want to loose too much of the comfort that I have especially since I am also thinking to upgrade the suspension either just springs like Eibach or full kit like the Bilstein B12 which will firm up the ride a little anyway. Which tyres on a 19" rim would you suggest that wouldn't loose too much of the confort that I get from the 18s?
2009 sdrive30i auto Sapphire Black / Coral Red

Online
User avatar
mr wilks
Lifer
Lifer
Posts: 19930
Joined: Wed Jul 04, 2012 10:02 pm
Location: Lancs or Normandy , i don't mind which

Wheel Sizes

Post by mr wilks » Thu Oct 10, 2019 9:39 pm

Silverstar wrote:
Thu Oct 10, 2019 9:19 pm
mr wilks wrote:
Wed Oct 09, 2019 7:30 pm
Enjoyable clip Silverstar but not sure how you reached the conclusion to stick with 18s over 19s :? Unless i missed something defining there was no outright winner in any of the 3 sizes to warrant someone changing from 19s to 18s or 17s to 19s :?
In the guys summary he mirrors my own thoughts on the subject in that the end user will find more noticeable difference between tyre brands / specs than he would from changing between sizes 17 - 18 -19 but using the same brand tyre .
In short if you choose the right size rubber & right brand manufacturer you can enjoy a 19inch wheel on any Z4 without compromising in any department .
In all the tests in the above clip the actual margins were down to a second & that was thrashing a hot hatch around a track .
Lastly as with most tyre reviews , they would be far more relevant if carried out on the same vehicle you were intending to fit the tyres to as a fwd turbo charged hot hatch is unlikely to handle anything like a rwd 2 seater na E89 E85 E86
Ultimately its down to personal preference which size wheels & which brand tyres the end user prefers :driving: in the end that's what really matters :thumbsup:
I've got 18" with Goodyear F1 Asymetric 3 on and am happy with the ride comfort / noise and handling they give. I was thinking at some point in the future to change up to 19"s for the looks! (when my new tyres have worn out lol!) but I don't want to loose too much of the comfort that I have especially since I am also thinking to upgrade the suspension either just springs like Eibach or full kit like the Bilstein B12 which will firm up the ride a little anyway. Which tyres on a 19" rim would you suggest that wouldn't loose too much of the confort that I get from the 18s?
I think your Goodyears are already in the top 5 so brandwise no reason to switch , i'm guessing now the oe 18s you are running 255 35 18 rear / 225 40 18 front ?
Switch to 19s for example style 326s which from factory run 255 30 19 , no reason why you can't go 245 35 19 or 255 35 19 so zero loss of comfort , better rim protection & enhance the looks . the front 19s 225 35 19 on 8j id leave as is though you could go 235 .
Its only Bmw that run the skimpy tyres ( Audi VW Mercedes all run bigger on same sized rims) though it seems they've finally seen sense & changed up on the G29 18s & 19s .
For comparison the 911 997 i have is on 19s , the front wheels are 8j same as style 326 but oe tyre size is 235 35 19 , plenty of comfort plenty wheel protection .
As the vid clip highlights , you can't just say one size is better than the others , there are way to many defining factors that need considering :thumbsup:
Previous Zs :roll:
E86
E85
///MR
Si E85
E89 23i
Si E85
E86
3.0Si E85
///MR
35i Msport 6spd
E86
///MR
E86
35is

911 997 Carrera4


Image

https://www.instagram.com/andy911wheels/

User avatar
scootr
Member
Member
Posts: 213
Joined: Mon Sep 16, 2019 11:27 am
Location: Temecula, California

Wheel Sizes

Post by scootr » Thu Oct 10, 2019 9:43 pm

I did a bunch of research on this before buying new tires and wheels. I decided to put 17 inch P4s on the E89 betting that the original engineering Plus better rubber would give me all I needed. The ride is lovely and it still bends a line so hard it can toss you against the door without sliding. I really need more side bolster.
2010 3.0L 6 spd
Image

Online
User avatar
mr wilks
Lifer
Lifer
Posts: 19930
Joined: Wed Jul 04, 2012 10:02 pm
Location: Lancs or Normandy , i don't mind which

Wheel Sizes

Post by mr wilks » Thu Oct 10, 2019 10:01 pm

scootr wrote:
Thu Oct 10, 2019 9:43 pm
I did a bunch of research on this before buying new tires and wheels. I decided to put 17 inch P4s on the E89 betting that the original engineering Plus better rubber would give me all I needed. The ride is lovely and it still bends a line so hard it can toss you against the door without sliding. I really need more side bolster.
Se seats in yours ? The E89 sport ones have adjustable bolster , they really grip your sides tight when activated :evil:
Previous Zs :roll:
E86
E85
///MR
Si E85
E89 23i
Si E85
E86
3.0Si E85
///MR
35i Msport 6spd
E86
///MR
E86
35is

911 997 Carrera4


Image

https://www.instagram.com/andy911wheels/

User avatar
scootr
Member
Member
Posts: 213
Joined: Mon Sep 16, 2019 11:27 am
Location: Temecula, California

Wheel Sizes

Post by scootr » Thu Oct 10, 2019 11:03 pm

Sounds good. Mine's a base model, manual adjustments with heat - heat's cool. But I'm aching for better support
2010 3.0L 6 spd
Image

Silverstar
Member
Member
Posts: 236
Joined: Fri Jun 21, 2019 10:06 am

Wheel Sizes

Post by Silverstar » Fri Oct 11, 2019 12:02 am

mr wilks wrote:
Thu Oct 10, 2019 9:39 pm
Silverstar wrote:
Thu Oct 10, 2019 9:19 pm
mr wilks wrote:
Wed Oct 09, 2019 7:30 pm
Enjoyable clip Silverstar but not sure how you reached the conclusion to stick with 18s over 19s :? Unless i missed something defining there was no outright winner in any of the 3 sizes to warrant someone changing from 19s to 18s or 17s to 19s :?
In the guys summary he mirrors my own thoughts on the subject in that the end user will find more noticeable difference between tyre brands / specs than he would from changing between sizes 17 - 18 -19 but using the same brand tyre .
In short if you choose the right size rubber & right brand manufacturer you can enjoy a 19inch wheel on any Z4 without compromising in any department .
In all the tests in the above clip the actual margins were down to a second & that was thrashing a hot hatch around a track .
Lastly as with most tyre reviews , they would be far more relevant if carried out on the same vehicle you were intending to fit the tyres to as a fwd turbo charged hot hatch is unlikely to handle anything like a rwd 2 seater na E89 E85 E86
Ultimately its down to personal preference which size wheels & which brand tyres the end user prefers :driving: in the end that's what really matters :thumbsup:
I've got 18" with Goodyear F1 Asymetric 3 on and am happy with the ride comfort / noise and handling they give. I was thinking at some point in the future to change up to 19"s for the looks! (when my new tyres have worn out lol!) but I don't want to loose too much of the comfort that I have especially since I am also thinking to upgrade the suspension either just springs like Eibach or full kit like the Bilstein B12 which will firm up the ride a little anyway. Which tyres on a 19" rim would you suggest that wouldn't loose too much of the confort that I get from the 18s?
I think your Goodyears are already in the top 5 so brandwise no reason to switch , i'm guessing now the oe 18s you are running 255 35 18 rear / 225 40 18 front ?
Switch to 19s for example style 326s which from factory run 255 30 19 , no reason why you can't go 245 35 19 or 255 35 19 so zero loss of comfort , better rim protection & enhance the looks . the front 19s 225 35 19 on 8j id leave as is though you could go 235 .
Its only Bmw that run the skimpy tyres ( Audi VW Mercedes all run bigger on same sized rims) though it seems they've finally seen sense & changed up on the G29 18s & 19s .
For comparison the 911 997 i have is on 19s , the front wheels are 8j same as style 326 but oe tyre size is 235 35 19 , plenty of comfort plenty wheel protection .
As the vid clip highlights , you can't just say one size is better than the others , there are way to many defining factors that need considering :thumbsup:

If you change the tyre profile from 255/30 to 255/35 would the affect the speedo reading? would it need recalibrating or something?
2009 sdrive30i auto Sapphire Black / Coral Red

User avatar
scootr
Member
Member
Posts: 213
Joined: Mon Sep 16, 2019 11:27 am
Location: Temecula, California

Wheel Sizes

Post by scootr » Fri Oct 11, 2019 2:39 am

Looks to be about 4.3% taller or about 4.3k at 100k.
2010 3.0L 6 spd
Image

Online
User avatar
mr wilks
Lifer
Lifer
Posts: 19930
Joined: Wed Jul 04, 2012 10:02 pm
Location: Lancs or Normandy , i don't mind which

Wheel Sizes

Post by mr wilks » Fri Oct 11, 2019 6:54 am

Upping the tyre sizes @silverstar will make the speedo more accurate , from factory if it reads 30mph you are probably doing 27mph , after
255 35 19 you should find the true speed is closer to what the speedo reads :thumbsup:
Previous Zs :roll:
E86
E85
///MR
Si E85
E89 23i
Si E85
E86
3.0Si E85
///MR
35i Msport 6spd
E86
///MR
E86
35is

911 997 Carrera4


Image

https://www.instagram.com/andy911wheels/

Post Reply