I refuse theory about heavier car with RFTs
Thread Starter
Contributors
Joined: Jun 2005
Posts: 2,799
Likes: 1
From: Chalandri/Athina/Hellas
Originally Posted by EBMCS03' post='400036' date='Mar 8 2007, 07:46 AM
Hahahha its not only 13kg that you saved... its ROLLING weight that you saved... which is A LOT!
Thread Starter
Contributors
Joined: Jun 2005
Posts: 2,799
Likes: 1
From: Chalandri/Athina/Hellas
Originally Posted by KAF' post='400065' date='Mar 8 2007, 09:12 AM
Quite, the issue is the amount of UNSPRUNG weight, not the weight of the car.
You did not need to do all this work, the weights of specific tyres can often be found on the manufacturers websites.
You did not need to do all this work, the weights of specific tyres can often be found on the manufacturers websites.
The unsprung weight is a little higher, whereas the car's weight is significantly lower.
It's not a scientific research, I was expected to see that RFTs are like 5 Kg. or more heavier in that size, but, I surprisly found that difference is only 1 Kg compaired to normal tyres. It was very easy for me, to take some pics during the swap and place them into the forum, as, I (most of the times) use to do.
Contributors
Joined: Feb 2006
Posts: 4,186
Likes: 2
From: UK
My Ride: Jan 2006 E63 650i Sport
.
Options:
Sport version (includes: sport-seats, sport-suspension, M-Sport steering wheel, Anthracite headliner, Shaddow Line), Saphire Black, Black Dakota Leather, Anthracite Maple Wood trim, Steptronic Auto, Xenons, NAV-Professional with Voice Control, TV, CD-Changer, Bluetooth, Logic7, Head-up Display, Comfort Access, Seat Heating front, Auto Dimming & Folding Mirrors, Extended Auto Air Conditioning, PDC.
.
Mods:
Spacers 5mm front & 15mm rear
.
Wheels:
20" Alpina Softline (Classic) with Dunlop Sport Maxx non-RFT (255/35/20 & 285/30/20)
Originally Posted by nicke60gre' post='400071' date='Mar 8 2007, 08:59 AM
Agree,
The unsprung weight is a little higher, whereas the car's weight is significantly lower.
It's not a scientific research, I was expected to see that RFTs are like 5 Kg. or more heavier in that size, but, I surprisly found that difference is only 1 Kg compaired to normal tyres. It was very easy for me, to take some pics during the swap and place them into the forum, as, I (most of the times) use to do.
The unsprung weight is a little higher, whereas the car's weight is significantly lower.
It's not a scientific research, I was expected to see that RFTs are like 5 Kg. or more heavier in that size, but, I surprisly found that difference is only 1 Kg compaired to normal tyres. It was very easy for me, to take some pics during the swap and place them into the forum, as, I (most of the times) use to do.
I'm not really buying this whole weight saving thing though, especially when looking at all the options you have on your car!! The ride height and general benefits of RFTs I can understand. The ride quality is still a massive turn-off for me and I'll be interested to hear how you get on with yours because you have a non-factory delivered suspension set-up. Hope it's not too uncomfortable for you...
Cheers
Senior Members
Joined: Sep 2005
Posts: 4,096
Likes: 0
From: Italy, Milano
My Ride: 545i SMG with Limited Slip Differential
Model Year: 2005
Originally Posted by baadaaboo' post='399961' date='Mar 8 2007, 03:51 AM
you don't need to go to work today? you really have time to do all these?! amazing!!
At least +4 kg/each tire .
With spare tire you save 13 Kg, it's true : with RFT you can remove the spare tire, with normal tires you cannot remove it and you balance the maior RFT weight .
Conclusion : with a 520i can mount RFT, with a 535d/545i/550i no because of quality of tire .
Thread Starter
Contributors
Joined: Jun 2005
Posts: 2,799
Likes: 1
From: Chalandri/Athina/Hellas
Originally Posted by AlexFW' post='401169' date='Mar 10 2007, 08:16 PM
He is a LOLman, because everyone knows that RFT are heavier .
At least +4 kg/each tire .
With spare tire you save 13 Kg, it's true : with RFT you can remove the spare tire, with normal tires you cannot remove it and you balance the maior RFT weight .
Conclusion : with a 520i can mount RFT, with a 535d/545i/550i no because of quality of tire .
At least +4 kg/each tire .
With spare tire you save 13 Kg, it's true : with RFT you can remove the spare tire, with normal tires you cannot remove it and you balance the maior RFT weight .
Conclusion : with a 520i can mount RFT, with a 535d/545i/550i no because of quality of tire .
http://forum.e46fanatics.com/showpost.php?...p;postcount=813
I'm gonna burn them
340 Rwhp
No comment
Contributors
Joined: Jul 2004
Posts: 3,486
Likes: 0
From: expat in The Netherlands
My Ride: BMW 545iA Black Sapphire
Model Year: 2005
Engine: 545i
Thanks Nick for the hands on info, very practical.
My experience with my 123's 18" Dunlop RFT : 26.5kg per corner.
I just received my OEM 172M's with Dunlop Sportmaxx, non RFT.
Interesting results :
Front : 26.6 kg
Rear: 28 kg
yep, the 172M's NON RFT (at least the rear wheels) are HEAVIER than the 18" RFT's ! so much for reduced unsprung weight. (in addition to the jack going back in the boot..
)
Anyways, my objective is to go to 19" and love the look of the 172's.
> If you want a rim performance (in the technical sense) upgrade > go with BBS or 167's !! they are pretty light (or other confirmed lightweight rims) . Each corner with tires should be in the region of 22kg.
If your considering going from stock 18" to the 172M's = don't expect any improvement with regards to unsprung weight.
Looking foward to the less jolting ride though...and the looks !
PS. I hope my bathroom scale meets the approval of some "members" here...it was made in 2001.
My experience with my 123's 18" Dunlop RFT : 26.5kg per corner.
I just received my OEM 172M's with Dunlop Sportmaxx, non RFT.
Interesting results :
Front : 26.6 kg
Rear: 28 kg
yep, the 172M's NON RFT (at least the rear wheels) are HEAVIER than the 18" RFT's ! so much for reduced unsprung weight. (in addition to the jack going back in the boot..
)Anyways, my objective is to go to 19" and love the look of the 172's.
> If you want a rim performance (in the technical sense) upgrade > go with BBS or 167's !! they are pretty light (or other confirmed lightweight rims) . Each corner with tires should be in the region of 22kg.
If your considering going from stock 18" to the 172M's = don't expect any improvement with regards to unsprung weight.
Looking foward to the less jolting ride though...and the looks !
PS. I hope my bathroom scale meets the approval of some "members" here...it was made in 2001.
Thread Starter
Contributors
Joined: Jun 2005
Posts: 2,799
Likes: 1
From: Chalandri/Athina/Hellas
Originally Posted by andy545' post='401184' date='Mar 10 2007, 09:24 PM
Looking foward to the less jolting ride though...and the looks !
PS. I hope my bathroom scale meets the approval of some "members" here...it was made in 2001.
PS. I hope my bathroom scale meets the approval of some "members" here...it was made in 2001.
I tried yesterday the right front wheel. Looks AWESOME, no gap at all, MONSTER
just a little rubbing in the inner plastic cover, ...simple mod for me, but there is no need for cutting/rolling.
Thread Starter
Contributors
Joined: Jun 2005
Posts: 2,799
Likes: 1
From: Chalandri/Athina/Hellas
Originally Posted by andy545' post='401184' date='Mar 10 2007, 09:24 PM
> If you want a rim performance (in the technical sense) upgrade > go with BBS or 167's !! they are pretty light (or other confirmed lightweight rims) . Each corner with tires should be in the region of 22kg.
Thread Starter
Contributors
Joined: Jun 2005
Posts: 2,799
Likes: 1
From: Chalandri/Athina/Hellas
Originally Posted by andy545' post='401193' date='Mar 10 2007, 09:46 PM
WOW ! 8kg lighter to my my 172M's :'(
