Should I bother?
Bore on the wheels is 72.5mm and the hub on a SW20 is 60.1mm I have been told. Is it worth trying to track a set down or will the nuts pull them up nicely anyway?
Centric rings for wheels
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This area is dedicated to technical discussions that don't fit into the more specific areas of the technical section and that may apply to any type of MR2. E.g. tyres, bodywork and rust repairs, lubrication etc. Please try to spell correctly because this will help people find information later if they are using search functionality. If you need assistance with your car and want to host a spanner day, please use the appropriate section of the forum: http://mr2.org.nz/phpbb3/viewforum.php?f=35 Thank you.
- thorns
- Club Member - MR2OCNZ
- Posts: 372
- Joined: Mon Jan 12, 2009 8:54 pm
- Stomping Ground: Christchurch
- Prime Mover: SW20
- First name: Paul
Centric rings for wheels
1990 SW20 Turbo, Previously 1991 Green SW20 Turbo basket case
- GDII
- Forum Moderator - MR2OCNZ
- Posts: 5740
- Joined: Sun Jul 10, 2011 5:13 pm
- Stomping Ground: Wellington
- Prime Mover: SW20
- First name: Phill
Re: Centric rings for wheels
I picked up a set from amazon for cheap. Possibly about $10USD for the set plus shipping. But they are 73.1mm wheel bore instead of your 72.5mm.
http://mr2.org.nz/phpbb3/viewtopic.php? ... 40#p130122
I have not had issues in the past with my other wheels not running rings but I don't have issues with them on the new wheels either.
http://mr2.org.nz/phpbb3/viewtopic.php? ... 40#p130122
I have not had issues in the past with my other wheels not running rings but I don't have issues with them on the new wheels either.
1990 SW20 MR2 G-Limited (GEN4 3SGTE Installed)
2000 AE111R Corolla Wagon NZ New Daily
1996 AE101R Corolla Sprint NZ New Selling Soon
1990 EP81 Starlet XL (Sold)
1990 EE90 Corolla XL (Sold)
Instagram https://www.instagram.com/sw20glimited/
2000 AE111R Corolla Wagon NZ New Daily
1996 AE101R Corolla Sprint NZ New Selling Soon
1990 EP81 Starlet XL (Sold)
1990 EE90 Corolla XL (Sold)
Instagram https://www.instagram.com/sw20glimited/
- thorns
- Club Member - MR2OCNZ
- Posts: 372
- Joined: Mon Jan 12, 2009 8:54 pm
- Stomping Ground: Christchurch
- Prime Mover: SW20
- First name: Paul
Re: Centric rings for wheels
Figured I might as well try them out, ordered a set online, hopefully arrive in time for the weekend so i can mount the new wheels/tyres up. Only a plastic set, but will keep an eye out for aluminium ones if I come across them.
1990 SW20 Turbo, Previously 1991 Green SW20 Turbo basket case
- 85AW20v
- Club Member - MR2OCNZ
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- Stomping Ground: Bay Of Plenty
- Prime Mover: AW11
- First name: Simon
Re: Centric rings for wheels
I hadn't ever run them on my AW racecar. I moved up to 15" rims so lower profile tyres and subsequently cracked a front hub around the lip on the centre of the hub flange. I wouldn't run anything without them now. I would think the standard OEM rims would be a tight fit over the lip in the centre of the flanges.
See ya
Simon
AW11 Racecar - 860kg
Simon
AW11 Racecar - 860kg
- GDII
- Forum Moderator - MR2OCNZ
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- Joined: Sun Jul 10, 2011 5:13 pm
- Stomping Ground: Wellington
- Prime Mover: SW20
- First name: Phill
Re: Centric rings for wheels
Yeah OEM does but aftermarket is normally 70+mm.85AW20v wrote:I hadn't ever run them on my AW racecar. I moved up to 15" rims so lower profile tyres and subsequently cracked a front hub around the lip on the centre of the hub flange. I wouldn't run anything without them now. I would think the standard OEM rims would be a tight fit over the lip in the centre of the flanges.
1990 SW20 MR2 G-Limited (GEN4 3SGTE Installed)
2000 AE111R Corolla Wagon NZ New Daily
1996 AE101R Corolla Sprint NZ New Selling Soon
1990 EP81 Starlet XL (Sold)
1990 EE90 Corolla XL (Sold)
Instagram https://www.instagram.com/sw20glimited/
2000 AE111R Corolla Wagon NZ New Daily
1996 AE101R Corolla Sprint NZ New Selling Soon
1990 EP81 Starlet XL (Sold)
1990 EE90 Corolla XL (Sold)
Instagram https://www.instagram.com/sw20glimited/
- thorns
- Club Member - MR2OCNZ
- Posts: 372
- Joined: Mon Jan 12, 2009 8:54 pm
- Stomping Ground: Christchurch
- Prime Mover: SW20
- First name: Paul
Re: Centric rings for wheels
Seems the bore must actually 72.6/72.7 or something, these 72.5mm drop in with a tiny amount of play. Probably pointless to run if they are not a snug fit im guessing as it kind of defeats the purpose.
1990 SW20 Turbo, Previously 1991 Green SW20 Turbo basket case
- GDII
- Forum Moderator - MR2OCNZ
- Posts: 5740
- Joined: Sun Jul 10, 2011 5:13 pm
- Stomping Ground: Wellington
- Prime Mover: SW20
- First name: Phill
Re: Centric rings for wheels
Some of mine did too. But I'm not having any issues with vibrations even at 160kph on track. Your lug nuts will centre the wheel properly and the friction on the mounting face of the wheel and brake rotor to hub works fine. 5 nuts at 110nm of torque is quite a bit to hold things in place.
1990 SW20 MR2 G-Limited (GEN4 3SGTE Installed)
2000 AE111R Corolla Wagon NZ New Daily
1996 AE101R Corolla Sprint NZ New Selling Soon
1990 EP81 Starlet XL (Sold)
1990 EE90 Corolla XL (Sold)
Instagram https://www.instagram.com/sw20glimited/
2000 AE111R Corolla Wagon NZ New Daily
1996 AE101R Corolla Sprint NZ New Selling Soon
1990 EP81 Starlet XL (Sold)
1990 EE90 Corolla XL (Sold)
Instagram https://www.instagram.com/sw20glimited/
- 85AW20v
- Club Member - MR2OCNZ
- Posts: 888
- Joined: Fri May 21, 2004 10:25 pm
- Stomping Ground: Bay Of Plenty
- Prime Mover: AW11
- First name: Simon
Re: Centric rings for wheels
The rings aren't there "to hold things in place". They're there to transfer the wheel/steering loads to the bearing rather than the flange flexing and then cracking, which is what happened to the AW.
See ya
Simon
AW11 Racecar - 860kg
Simon
AW11 Racecar - 860kg
- Gleshlich
- Club Member - MR2OCNZ
- Posts: 317
- Joined: Sun May 22, 2016 12:08 am
- Stomping Ground: Wellington
- Prime Mover: SW20
- First name: Justin
Re: Centric rings for wheels
The wheel studs are not intended for loading in shear (right angle to the stud). Centric rings allow for all the shear load to be taken by the hub. This means that the wheel studs are only stressed by forces acting towards left and right. It's not really to do with the vibrations moreso manufacturer design. Be careful with plastic rings as they can melt during track duty.
Current:
1989 V6 Widebody SW
1996 EK Civic Hatch
2007 BMW 335i Touring
1989 V6 Widebody SW
1996 EK Civic Hatch
2007 BMW 335i Touring