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19" wheels
- DrNick
- Senior Member
- Posts: 2399
- Joined: Mon Nov 09, 2009 10:42 pm
- Location: Wickham, Hampshire
19" wheels
Im thinking of changing my zed to a E89 and have seen a couple that might suit however they all seem to have 19" wheels - I'm not that keen on these (tyres/ride quality etc) - if I wanted to change them for 18's would I have to do anything to the speedo etc?
N
N
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- dr_john
- Lifer
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Re: 19" wheels
Wouldn't think so, I believe that the outside diameter of the tyre is the same on either size wheel as the rim is thinner on the 19 inch.
I may stand corrected though!
I may stand corrected though!
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- Lifer
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Re: 19" wheels
Basically you have to keep the wheel diameter the same, known as the rolling radius. To do that you would have to increase the size of the tyre profile on the 18'' wheel.
For example a style 276 wheel can be 18'' or 19''
An 18'' runs on 225/40/18s and 255/35/18s and a 19'' runs on 225/35/19s and 255/30/19s.
The difference in circumference between the wheels in the example above would remain less than a millimetre whereas if you used the same profile tyres on on an 18'' and 19'' wheel it would be 76mm
Simples
For example a style 276 wheel can be 18'' or 19''
An 18'' runs on 225/40/18s and 255/35/18s and a 19'' runs on 225/35/19s and 255/30/19s.
The difference in circumference between the wheels in the example above would remain less than a millimetre whereas if you used the same profile tyres on on an 18'' and 19'' wheel it would be 76mm
Simples
- mr wilks
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Re: 19" wheels
Most car,s speedo,s don,t read correct anyhow Nick , you can check exactly with a TomTom satnav or similar .
Ive recently changed my Astravan wheels from the standard 16,s to 18,s & my speedo is now only 1mph out at 30 whereas before it was 3mph out always good to know what your car is actually doing when in speed zones on motorway etc
Ive recently changed my Astravan wheels from the standard 16,s to 18,s & my speedo is now only 1mph out at 30 whereas before it was 3mph out always good to know what your car is actually doing when in speed zones on motorway etc
3 ZMRs
3 E89s
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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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Re: 19" wheels
Dr Nick,
I'm wanting to change my wheels in the other direction ..from 18" to 19".
Maybe we could be the perfect match
I'm wanting to change my wheels in the other direction ..from 18" to 19".
Maybe we could be the perfect match
- Angie4m
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Re: 19" wheels
I was going to suggest your name. Maybe it's fate.....you will get these 19s sooner or laterchester2000 wrote:Dr Nick,
I'm wanting to change my wheels in the other direction ..from 18" to 19".
Maybe we could be the perfect match
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Re: 19" wheels
Thanks Angie,
I'm in no rush...all good things come to those that wait
I'm in no rush...all good things come to those that wait
- DrNick
- Senior Member
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Re: 19" wheels
Thanks guys - this makes sense.
chester2000, - I have yet to buy the car! Shall bear this in mind...
Off to Guildford this morning to have a look...
chester2000, - I have yet to buy the car! Shall bear this in mind...
Off to Guildford this morning to have a look...
2007 Carbon Black 2.0 Sport + comfort pack + bluetooth - Loved and not forgotten!
2012 E89 Space Grey M Sport 2.0 Auto - need to update signature!
- lux
- Lifer
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Re: 19" wheels
Leave the 19's on it Nick, looks loads better and ride difference isn't that much (I had 18's on my first E89) unless you hit a pot hole!!
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- TitanTim
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Re: 19" wheels
+1 the 19s look better, wished i'd specced them now, obviously rubber will be slightly costlier than 18s.
Tim.
Tim.
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Re: 19" wheels
I think it depends on the wheel itself - I like your alloys Tim - I have the 19 msport and I like those as well - When looking I would have been happy with your wheels or the ones I got
- dr_john
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Re: 19" wheels
Agreed, I've had E89's with 18s and 19s and it's worth putting up with a slightly firmer ride to get the looks of the 19s. The Msport option adds a bit of class as well.lux wrote:Leave the 19's on it Nick, looks loads better and ride difference isn't that much (I had 18's on my first E89) unless you hit a pot hole!!
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- ronk
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Re: 19" wheels
I think the rubber is a lot more expensive but if you don't do many miles the tyres will be cracked before they're worn ! My car is three with 12k so I'm in that boat.TitanTim wrote:+1 the 19s look better, wished i'd specced them now, obviously rubber will be slightly costlier than 18s.
There is a recommended age that they (tyres) are supposed to be changed irrespective of wear I believe.
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- TitanTim
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Re: 19" wheels
The runflats can crack prematurely due to the harder compound, my old Cooper S was bad for this but haven't noticed it so much on the latest generation tyres. I think 6 years is probably the max on normal tyres before I would want to change if not covering the mileage but with runflats probably sooner.ronk wrote:I think the rubber is a lot more expensive but if you don't do many miles the tyres will be cracked before they're worn ! My car is three with 12k so I'm in that boat.TitanTim wrote:+1 the 19s look better, wished i'd specced them now, obviously rubber will be slightly costlier than 18s.
There is a recommended age that they (tyres) are supposed to be changed irrespective of wear I believe.
Tim.
- DrNick
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Re: 19" wheels
2007 Carbon Black 2.0 Sport + comfort pack + bluetooth - Loved and not forgotten!
2012 E89 Space Grey M Sport 2.0 Auto - need to update signature!