20's

Jedi1972 · 05-06-2017, 08:33 AM

Hi guys

I've currently got 403m's on my f30. I'm thinking of upgrading to 405m in 20's. Those of you who have 20's on, what's the ride like? I know ones persons perspective might be different to another person, but generally is the quality of the ride very hard?

What profile tyres are you running for 20 inch rims please. Thanks

M5 F90 (2018) · 05-06-2017, 08:46 AM

No issues at all and that is with running Pirelli RF's. Even central London roads and ACS springs and still think they are more than fine. You will not regret it.

matty81 · 05-06-2017, 11:37 AM

I have 405s 20" and it seems fine to me

rjberry · 05-06-2017, 12:10 PM

I changed to 405s a couple of months ago and they're fine. I try and avoid drain covers and potholes as much as possible but I did the same on the 442s. Where I've not been able to avoid them there is a bit more of a clunk but nothing to worry about so far.

The biggest difference I've noticed is the car seems so much lighter. I've got used to it now but initially it felt as though the car was floating

Tengocity · 05-06-2017, 12:37 PM

Quote:

Originally Posted by rjberry

I changed to 405s a couple of months ago and they're fine. I try and avoid drain covers and potholes as much as possible but I did the same on the 442s. Where I've not been able to avoid them there is a bit more of a clunk but nothing to worry about so far.

The biggest difference I've noticed is the car seems so much lighter. I've got used to it now but initially it felt as though the car was floating

Because of the reduction in unsprung weight you think?

Amr_d · 05-06-2017, 12:39 PM

Mine is on 20" 404's. Look miles better when parked next to one with 19".

No issues with ride, go for it.

MickyD'bo · 05-06-2017, 12:43 PM

Quote:

Originally Posted by Amr_d

Mine is on 20" 404's. Look miles better when parked next to one with 19".

No issues with ride, go for it.

Nice car but did you take that photo with a cabbage?

Amr_d · 05-06-2017, 12:58 PM

Quote:

Originally Posted by MackyDobbo_Dobster_D'BO

Nice car but did you take that photo with a cabbage?

I took them with the wifes camera when we collected it from the dealer last week.

How about this one taken today

MickyD'bo · 05-06-2017, 01:05 PM

Quote:

Originally Posted by Amr_d

I took them with the wifes camera when we collected it from the dealer last week.

How about this one taken today

WOW!!!!! that is stunning mate. Seriously nice. Never really been keen on those alloys, but they look mint there.

DexGC · 05-06-2017, 01:32 PM

Quote:

Originally Posted by Tengocity

Quote:

Originally Posted by rjberry

I changed to 405s a couple of months ago and they're fine. I try and avoid drain covers and potholes as much as possible but I did the same on the 442s. Where I've not been able to avoid them there is a bit more of a clunk but nothing to worry about so far.

The biggest difference I've noticed is the car seems so much lighter. I've got used to it now but initially it felt as though the car was floating

Because of the reduction in unsprung weight you think?

The unsprung weight reduction of 3kg per wheel over my 403s made a very noticeable difference, car definitely feels lighter and like it gets moving more quickly, when moving and from a standstill

rjberry · 05-06-2017, 01:39 PM

Quote:

Originally Posted by Tengocity

Quote:

Originally Posted by rjberry

I changed to 405s a couple of months ago and they're fine. I try and avoid drain covers and potholes as much as possible but I did the same on the 442s. Where I've not been able to avoid them there is a bit more of a clunk but nothing to worry about so far.

The biggest difference I've noticed is the car seems so much lighter. I've got used to it now but initially it felt as though the car was floating

Because of the reduction in unsprung weight you think?

Possibly. The only change was the wheels and tyres. I couldn't find the exact weights of the wheels and tyres but I do wonder if the difference is down to the reduction in weight.

I did wonder if the weight being reduced evenly across the car would have shifted the balance slightly but the technical details are beyond me so I haven't tried to understand what may have happened.

It was quite unusual, I wasn't expecting the change to be so noticeable but it was enough for me to realise there was a difference.

Tengocity · 05-06-2017, 02:00 PM

Quote:

Originally Posted by Dex78

Quote:

Originally Posted by Tengocity

Quote:

Originally Posted by rjberry

I changed to 405s a couple of months ago and they're fine. I try and avoid drain covers and potholes as much as possible but I did the same on the 442s. Where I've not been able to avoid them there is a bit more of a clunk but nothing to worry about so far.

The biggest difference I've noticed is the car seems so much lighter. I've got used to it now but initially it felt as though the car was floating

Because of the reduction in unsprung weight you think?

The unsprung weight reduction of 3kg per wheel over my 403s made a very noticeable difference, car definitely feels lighter and like it gets moving more quickly, when moving and from a standstill

Quote:

Originally Posted by rjberry

Quote:

Originally Posted by Tengocity

Quote:

Originally Posted by rjberry

I changed to 405s a couple of months ago and they're fine. I try and avoid drain covers and potholes as much as possible but I did the same on the 442s. Where I've not been able to avoid them there is a bit more of a clunk but nothing to worry about so far.

The biggest difference I've noticed is the car seems so much lighter. I've got used to it now but initially it felt as though the car was floating

Because of the reduction in unsprung weight you think?

Possibly. The only change was the wheels and tyres. I couldn't find the exact weights of the wheels and tyres but I do wonder if the difference is down to the reduction in weight.

I did wonder if the weight being reduced evenly across the car would have shifted the balance slightly but the technical details are beyond me so I haven't tried to understand what may have happened.

It was quite unusual, I wasn't expecting the change to be so noticeable but it was enough for me to realise there was a difference.

3kg for the wheel and also some more in the tyre as the 20 inch tyre has less sidewall which saves more too.

This tempts me more than looks if I'm honest.

DexGC · 05-06-2017, 02:14 PM

I looked into it and if i went from the Pirelli run flats to MPSS is was about another 1KG per wheel

F15CCT · 05-06-2017, 05:02 PM

Is it only the 405 that are lighter or are there others like m4 alloys etc?

Tengocity · 05-06-2017, 05:15 PM

Quote:

Originally Posted by F15CCT

Is it only the 405 that are lighter or are there others like m4 alloys etc?

The 405s are forged so definitely lighter. I don't think the ones above are, though they're still stunning looking.

CazuaLLUK · 05-06-2017, 05:29 PM

Quote:

Originally Posted by Amr_d

I took them with the wifes camera when we collected it from the dealer last week.

How about this one taken today

Wow, I really like this!

Jedi1972 · 05-06-2017, 07:11 PM

Ok so seems like there's little compromise of the quality of the ride to switch to 20's. What profile tyres are you running on 20's? Thanks

DexGC · 05-07-2017, 12:35 AM

The OEM 20" tyre size is 225/35/20 front, 255/30/20 rear

rosstin · 05-07-2017, 02:01 AM

Quote:

Originally Posted by Tengocity

3kg for the wheel and also some more in the tyre as the 20 inch tyre has less sidewall which saves more too.

This tempts me more than looks if I'm honest.

Also tempted for this reason. Am I right in thinking there is more to be saved by swapping out the standard m sports discs, to dimpled m performance ones too?

Tengocity · 05-07-2017, 02:41 AM

Quote:

Originally Posted by rosstin

Quote:

Originally Posted by Tengocity

3kg for the wheel and also some more in the tyre as the 20 inch tyre has less sidewall which saves more too.

This tempts me more than looks if I'm honest.

Also tempted for this reason. Am I right in thinking there is more to be saved by swapping out the standard m sports discs, to dimpled m performance ones too?

That would save maybe a few grams! But they look much better so I preferred them for that reason when it was time to change discs.

B58_Touring · 05-07-2017, 02:44 AM

Quote:

Originally Posted by Amr_d

Mine is on 20" 404's. Look miles better when parked next to one with 19".

No issues with ride, go for it.

Are you in Hartlepool? Think I seen this car parked up whilst lost in Bishop on friday night, wheels caught my eye straight away

rosstin · 05-07-2017, 02:57 AM

Quote:

Originally Posted by Tengocity

Quote:

Originally Posted by rosstin

Quote:

Originally Posted by Tengocity

3kg for the wheel and also some more in the tyre as the 20 inch tyre has less sidewall which saves more too.

This tempts me more than looks if I'm honest.

Also tempted for this reason. Am I right in thinking there is more to be saved by swapping out the standard m sports discs, to dimpled m performance ones too?

That would save maybe a few grams! But they look much better so I preferred them for that reason when it was time to change discs.

So you have the dimpled discs?
I had read somewhere there was kg's to be saved, but that's obviously not correct then?

05-06-2017, 08:33 AM	#1
Jedi1972 New Member 4 Rep 14 Posts Drives: F30 330d M Sport Join Date: Apr 2017 Location: Crawley, UK iTrader: (0)	20's Hi guys I've currently got 403m's on my f30. I'm thinking of upgrading to 405m in 20's. Those of you who have 20's on, what's the ride like? I know ones persons perspective might be different to another person, but generally is the quality of the ride very hard? What profile tyres are you running for 20 inch rims please. Thanks
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05-06-2017, 08:46 AM	#2
M5 F90 (2018) Lieutenant 141 Rep 401 Posts Drives: M5 Join Date: Sep 2015 Location: UK iTrader: (0)	No issues at all and that is with running Pirelli RF's. Even central London roads and ACS springs and still think they are more than fine. You will not regret it.
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05-06-2017, 11:37 AM	#3
matty81 First Lieutenant 84 Rep 306 Posts Drives: F30 335i Join Date: Jun 2013 Location: newbury iTrader: (0)	I have 405s 20" and it seems fine to me
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05-06-2017, 12:10 PM	#4
rjberry Major 412 Rep 1,157 Posts Drives: F31 340i Ruby Red II Join Date: May 2012 Location: South Wales iTrader: (0)	I changed to 405s a couple of months ago and they're fine. I try and avoid drain covers and potholes as much as possible but I did the same on the 442s. Where I've not been able to avoid them there is a bit more of a clunk but nothing to worry about so far. The biggest difference I've noticed is the car seems so much lighter. I've got used to it now but initially it felt as though the car was floating __________________ Current: recovering slowly Previous: F31 340i Ruby Red IIM5 Singapore Grey, F30 335d Moonstone, F30 320d Tanzanite Blue
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05-06-2017, 12:39 PM	#6
Amr_d Private First Class 77 Rep 112 Posts Drives: F30 335d M Sport Join Date: Jun 2016 Location: North East iTrader: (0)	Mine is on 20" 404's. Look miles better when parked next to one with 19". No issues with ride, go for it.
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05-06-2017, 02:14 PM	#13
DexGC Lieutenant 217 Rep 503 Posts Drives: 435D Gran Coupe Join Date: Feb 2012 Location: Surrey iTrader: (0)	I looked into it and if i went from the Pirelli run flats to MPSS is was about another 1KG per wheel
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05-06-2017, 05:02 PM	#14
F15CCT Captain 84 Rep 611 Posts Drives: F31 335d Join Date: Jan 2016 Location: North London iTrader: (0)	Is it only the 405 that are lighter or are there others like m4 alloys etc?
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05-06-2017, 07:11 PM	#17
Jedi1972 New Member 4 Rep 14 Posts Drives: F30 330d M Sport Join Date: Apr 2017 Location: Crawley, UK iTrader: (0)	Ok so seems like there's little compromise of the quality of the ride to switch to 20's. What profile tyres are you running on 20's? Thanks
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05-07-2017, 12:35 AM	#18
DexGC Lieutenant 217 Rep 503 Posts Drives: 435D Gran Coupe Join Date: Feb 2012 Location: Surrey iTrader: (0)	The OEM 20" tyre size is 225/35/20 front, 255/30/20 rear
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