Vibrations and noise - wheels and tyres

NewV90Owner · May 20th, 2019, 08:20

I found this in a Volvo SPA technical bulletin (Technical Journal 32161.2.0):

When wheels are assembled at our wheel supplier, then it is balanced and also tested for tire uniformity. Once a wheel is found to be outside the specifications it will be reworked (matched).
During matching, the tire will be rotated slightly on the rim to find a better position on rim so that force variations will be lower.
The thresholds target levels was reduced from 2016 week 35, it will ensure less vibrations.
* Factory specifications from 16w35: S90/V90 with 20” Pirelli tires = 105N, V90CC = 90N. All other vehicles / tires remain 120N at tire pressure 3.0 Bar (44 PSI).
From 17w09, a new assembly line will be used at our wheel supplier, it will automatically match tire/rim positions on all wheels, it will result in less tire uniformity / force variations.
The purpose of automatic matching is to let the wheel balancing machine find the tires’ optimal position on rim before being mounted.
* Wheels that have been matched properly will have a white dot printed on the tire from factory.

Here is a link: https://www.volvotechinfo.com/index....2017-03-14.pdf

I find this extremely interesting. In 2016 and 2017 Volvo tried hard to make the SPA cars smoother and reduce vibrations and noise. There have been several reports on this forum where some cars seem to be smoother than others and reports that newer cars are smoother.

It is worth noting that I don't think any car fitting garage is going to fir tyres to rims like this!

I am certainly going to look for the white dot on my car.

Haldex · May 20th, 2019, 10:07

Noticed a white dot on my factory-fitted summers - never knew what they were for..

Thanks!

Cmjs · May 20th, 2019, 13:39

Hi. This bulletin refers to a process called road force balancing. Search for hunter road force balancing to find a tyre shop near you who can offer the same service. Very few and far between but they are out there. Have always fixed my wheel wobble issues in the past and if not have always been the first place I start in my diagnosis

Bash D Bishop · May 21st, 2019, 11:44

This will help locate a garage with Hunter equipment.

https://www.balancemycar.co.uk/

Deman77 · May 24th, 2019, 09:30

I had mine done yesterday. Can’t say I noticed much difference. But they definitely overinflated the tyres which on conti+20+air is a disaster.
I will feedback some more after I drive with my usual pressure a bit.

May 20th, 2019, 08:20	#1
NewV90Owner Junior Member Last Online: Jan 3rd, 2020 19:12 Join Date: Jun 2017 Location: Edinburgh	Vibrations and noise - wheels and tyres I found this in a Volvo SPA technical bulletin (Technical Journal 32161.2.0): When wheels are assembled at our wheel supplier, then it is balanced and also tested for tire uniformity. Once a wheel is found to be outside the specifications it will be reworked (matched). During matching, the tire will be rotated slightly on the rim to find a better position on rim so that force variations will be lower. The thresholds target levels was reduced from 2016 week 35, it will ensure less vibrations. * Factory specifications from 16w35: S90/V90 with 20” Pirelli tires = 105N, V90CC = 90N. All other vehicles / tires remain 120N at tire pressure 3.0 Bar (44 PSI). From 17w09, a new assembly line will be used at our wheel supplier, it will automatically match tire/rim positions on all wheels, it will result in less tire uniformity / force variations. The purpose of automatic matching is to let the wheel balancing machine find the tires’ optimal position on rim before being mounted. * Wheels that have been matched properly will have a white dot printed on the tire from factory. Here is a link: https://www.volvotechinfo.com/index....2017-03-14.pdf I find this extremely interesting. In 2016 and 2017 Volvo tried hard to make the SPA cars smoother and reduce vibrations and noise. There have been several reports on this forum where some cars seem to be smoother than others and reports that newer cars are smoother. It is worth noting that I don't think any car fitting garage is going to fir tyres to rims like this! I am certainly going to look for the white dot on my car.

May 20th, 2019, 10:07	#2
Haldex Premier Member Last Online: Dec 18th, 2023 13:17 Join Date: Mar 2018 Location: Paris	Noticed a white dot on my factory-fitted summers - never knew what they were for.. Thanks! __________________ V60 D3 V60 D5 RD XC60 D5 RD AWD XC40 B4 RD AWD

May 20th, 2019, 13:39	#3
Cmjs New Member Last Online: Mar 19th, 2021 07:41 Join Date: Nov 2018 Location: Lancashire	Hi. This bulletin refers to a process called road force balancing. Search for hunter road force balancing to find a tyre shop near you who can offer the same service. Very few and far between but they are out there. Have always fixed my wheel wobble issues in the past and if not have always been the first place I start in my diagnosis __________________ 2018 XC90 R D5 Powerplus, Onyx black with black, Xenium, Winter, BLISS, Apple play, Tow bar

May 24th, 2019, 09:30	#5
Deman77 Master Member Last Online: Apr 1st, 2022 14:14 Join Date: Jan 2016 Location: Greater London	I had mine done yesterday. Can’t say I noticed much difference. But they definitely overinflated the tyres which on conti+20+air is a disaster. I will feedback some more after I drive with my usual pressure a bit. __________________ XC90 D5 P* MY16 BMW i3

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May 21st, 2019, 11:44	#4
Bash D Bishop Volvo Virgin Last Online: Feb 20th, 2023 22:00 Join Date: Jan 2019 Location: Eskbank	This will help locate a garage with Hunter equipment. https://www.balancemycar.co.uk/

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