Any differences between 789 M and 706 M Wheels?

M135iXdriver · 05-25-2019, 06:30 AM

Today I went to take a look at a M5 Competition. Had a little chat with the salesman there... we talked about the rims and then I was told the following:

"I like the standard wheels more than the the competition set. The reason is that the tire is bedded a bit different, the comp. rim is slightly wider thus the rubber..." and so on... and so on...

I was surprised to say the least... all the 20" wheels are 9.5J wide... unfortunately they had not one M5 Comp. there with the 789 M Rims to compare with.

To all M5 (Comp.) owners... can you confirm? I feel a bit as if I was told some BS but I'd like to know for sure.

Thanks

PS: I know for sure that the 789 M Rims are lighter than the regular ones thanks to this forum.

neohh · 05-25-2019, 04:48 PM

789M is forged and 706M is not. Definitely get the 789M.

brad850csi · 05-25-2019, 09:20 PM

The wheels are the same width and same offset. If the guy at the dealer noticed a tyre shape difference it might have been because the Pirellis and Michelins will have a slightly different shape.

As neohh said, the 789m wheels are forged and about 4kg lighter for each wheel - definitely the better option to go for.

MNoob · 05-25-2019, 10:12 PM

The salesman was downplaying the competition because he didn't have one on the lot. Total BS, and I bet he knew it.

masmole · 05-25-2019, 10:39 PM

Definitely a bunch of BS because the 789M and 706M wheels have the same widths up front (9.5) as well as rear (10.5) and like someone said, same offsets too. So the only difference is style and construction. The 789M being forged means they’re not only stronger but also lighter than the cast 706M which are very heavy wheels. Such a reduction in unsprung weight offers a considerable advantage in performance potential for cars that have the 789M.

M135iXdriver · 05-26-2019, 03:12 AM

First of all, thank you... to every single one of you. Yes, the comp. wheels are forged... I did know this but forgot to mention. This one was about the tire shape. Will for sure go with the comp. wheels and pray for Michelins.

MCOMP · 05-26-2019, 05:45 PM

Quote:

Originally Posted by M135iXdriver

First of all, thank you... to every single one of you. Yes, the comp. wheels are forged... I did know this but forgot to mention. This one was about the tire shape. Will for sure go with the comp. wheels and pray for Michelins.

Don't pray for Michelins, find the car you want and make sure it has them or continue looking, lots of Comps out there, I don't love the Comp wheels so bought an in stock Comp with Black 706 wheels and have been happy with the decision even though they came with Pirelli's, I will replace with Michelins when needed.

M135iXdriver · 05-27-2019, 02:04 AM

Quote:

Originally Posted by MCOMP

Don't pray for Michelins, find the car you want and make sure it has them or continue looking, lots of Comps out there, I don't love the Comp wheels so bought an in stock Comp with Black 706 wheels and have been happy with the decision even though they came with Pirelli's, I will replace with Michelins when needed.

Sorry, I should have mentioned that I will order a car later this year - thus that's why I wrote "pray" for Michelins.

05-25-2019, 06:30 AM	#1
M135iXdriver First Lieutenant 200 Rep 327 Posts Drives: BMW M5 Competiton Join Date: Feb 2015 Location: Northwestern Switzerland veeeeery close to the German Autobahn iTrader: (0)	Today I went to take a look at a M5 Competition. Had a little chat with the salesman there... we talked about the rims and then I was told the following: "I like the standard wheels more than the the competition set. The reason is that the tire is bedded a bit different, the comp. rim is slightly wider thus the rubber..." and so on... and so on... I was surprised to say the least... all the 20" wheels are 9.5J wide... unfortunately they had not one M5 Comp. there with the 789 M Rims to compare with. To all M5 (Comp.) owners... can you confirm? I feel a bit as if I was told some BS but I'd like to know for sure. Thanks PS: I know for sure that the 789 M Rims are lighter than the regular ones thanks to this forum. __________________ 2019 - BMW M5C MY2019 (Individual Urban Green) 2016 - VW Passat B8 2.0 TSI (276 bhp) R-Line (sold) 2013 - BMW M135i xDrive 3.0 (316 bhp) (sold) 2010 - Mazda 3 MPS BL 2.3 (256 bhp) (sold)
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05-25-2019, 04:48 PM	#2
neohh Lieutenant 168 Rep 454 Posts Drives: F90 M5 Join Date: Feb 2018 Location: Toronto iTrader: (0)	789M is forged and 706M is not. Definitely get the 789M.
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05-25-2019, 09:20 PM	#3
brad850csi Colonel 1316 Rep 2,349 Posts Drives: 16 F13 M6 Comp Join Date: Jan 2015 Location: Auckland, New Zealand iTrader: (0)	The wheels are the same width and same offset. If the guy at the dealer noticed a tyre shape difference it might have been because the Pirellis and Michelins will have a slightly different shape. As neohh said, the 789m wheels are forged and about 4kg lighter for each wheel - definitely the better option to go for. __________________ SCOTT26 "So as an admirer of the M5 and a potential customer of an M5 Touring. I would run naked around the streets of Garching if they were to offer one."
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05-25-2019, 10:12 PM	#4
MNoob Grand Duke 1540 Rep 1,114 Posts Drives: 2023 M4CSL Join Date: Dec 2015 Location: NorCal iTrader: (1) Garage List 2024 BMW X3MC [10.00] 2005 Lotus Elise [10.00] 2023 BMW M4 CSL [10.00]	The salesman was downplaying the competition because he didn't have one on the lot. Total BS, and I bet he knew it. __________________ 2023 M4CSL 2005 Lotus Elise
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05-25-2019, 10:39 PM	#5
masmole Captain 266 Rep 770 Posts Drives: blue, gray, brown cars Join Date: Sep 2005 Location: Chicago, IL iTrader: (0)	Definitely a bunch of BS because the 789M and 706M wheels have the same widths up front (9.5) as well as rear (10.5) and like someone said, same offsets too. So the only difference is style and construction. The 789M being forged means they’re not only stronger but also lighter than the cast 706M which are very heavy wheels. Such a reduction in unsprung weight offers a considerable advantage in performance potential for cars that have the 789M. __________________ 2021 A6 Allroad, 2020 SQ7, 2019 M5 Comp, 2011 GT3 past: A4, S4, X5 4.8is, SLK55, E60 M5, RS4, ML63, E92 M3, Q5, Touareg TDI, Escalade, SQ5, RS7, Velar FE, Q7
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05-26-2019, 03:12 AM	#6
M135iXdriver First Lieutenant 200 Rep 327 Posts Drives: BMW M5 Competiton Join Date: Feb 2015 Location: Northwestern Switzerland veeeeery close to the German Autobahn iTrader: (0)	First of all, thank you... to every single one of you. Yes, the comp. wheels are forged... I did know this but forgot to mention. This one was about the tire shape. Will for sure go with the comp. wheels and pray for Michelins. __________________ 2019 - BMW M5C MY2019 (Individual Urban Green) 2016 - VW Passat B8 2.0 TSI (276 bhp) R-Line (sold) 2013 - BMW M135i xDrive 3.0 (316 bhp) (sold) 2010 - Mazda 3 MPS BL 2.3 (256 bhp) (sold)
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