Steel Rims for D3 - Dynamic 17"

[4WDing]

Hi all, i've followed some threads on the favorite topic of tyre choice for D3's.

I have (255/60/18) grabbers AT2's on my standard alloys but wish to go to a 17" rim for a higher profile tyre and LT mud terrain tyre choices.
Looking at the BFG KM2's 245/70.

Does anyone have any advice on the Dynamic Steel rims - pros & cons ?
I presume they are heavier than alloys but much much cheaper for a second set that only gets "big trip" use. Or...are they good enough to leave on the car all the time ?

thanks John

[gghaggis]

On my D3, I left them on most of the time, but I had different wheel nuts to secure them (from a Toyota LC). Note that they may/may not be legal in your state.

Cheers,

Gordon

[oldsalt]

Yep..as Gordon said - check out the legality of them (offset - load rating etc) - there's lots of info on here so do a search and be prepared for a bit of reading....good luck.

[4WDing]

Thanks Guys, yes I haved checked other threads which verified they are legal in Vic (and need special D3 wheel nuts) so has anyone feedback on the steel Dynamic rims?

cheers
John

[d3viate]

Had mine on for about 60,000 kms. Do not put the alloys on, they just sit in the shed looking new, but I live in the Kimberley and more than half the time the car is started, it goes offroad. Can't say much about them, they give no problems. I run 265/70/17 LT Mickey Thompsons at the moment. Maybe next change of tyres I will get them blasted and powder coated as the paint is deteriorating now after the beaches and salt flats in the last two years.

[Owl]

Thanks Guys, yes I haved checked other threads which verified they are legal in Vic (and need special D3 wheel nuts) so has anyone feedback on the steel Dynamic rims?

cheers
John
Hi John,
The Dynamic rims are not legal in Vic. They have 30mm offset - standard Disco 3/4 rims are 53mm offset - so track changes by 46mm. Maximum allowable in Vic is 25mm.

Ian

[discojools]

4WDing,
You will not be disappointed with the KM2s. Just did a trip to Sunset Country and Big Desert and they performed faultlessly.. They are quiet at speed on road and effortless offroad. They hum a bit on the road at low speed though.
So good that I am considering selling my 18" HSE wheel with Grabbers.
Surprised to hear that the Dynamics are illegal in Vic! Can't be right.

Discojools.

[rmp]

Hi John,
The Dynamic rims are not legal in Vic. They have 30mm offset - standard Disco 3/4 rims are 53mm offset - so track changes by 46mm. Maximum allowable in Vic is 25mm.

Ian

Correct. Check out the VSIs (8 I think) for details. It's all there.

BTW the BB-6 alloys are now, finally, being made to legal standards ie +45 offset and 9+ turns of the nut, 1400kg rating. Go for those.

[4WDing]

Thanks All,
I checked with Chris Hummer at Dynamic and all is OK.
cheers
John

Our 17x7” 30P 5x120 Dynamic wheel for Discovery 3 adds a total of 19-20mm on the vehicle track width, this is well within the 25mm maximum.

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[rmp]

Thanks All,
I checked with Chris Hummer at Dynamic and all is OK.
cheers
John

Our 17x7” 30P 5x120 Dynamic wheel for Discovery 3 adds a total of 19-20mm on the vehicle track width, this is well within the 25mm maximum.

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The standard offset is +53. An offset of +30 is 23mm different. Per side. That makes for a 46mm track increase. From memory that's only permissible at the back for live-axle vehicles.

25mm = 12.5mm diff per side max.

[Duck's Guts]

The standard offset is +53. An offset of +30 is 23mm different. Per side. That makes for a 46mm track increase. From memory that's only permissible at the back for live-axle vehicles.

25mm = 12.5mm diff per side max.


Ahh, you are forgetting that the factory rim is 8" & the Dynamic Steel rim is 7".
Offset is calculated from the centre of the rim. And offset is the distance to where the rim is mounted to the hub. The two dimensions influence changes in wheel track.

The calc is as follows:
Factory +53mm offset on 8" rim width.
Alternate rim (say Dynamic Steelie) is +30mm on 7" rim.

The position of the outside edge of the alternate rim in relation to the factory position is calculated as:
(+53mm - +30mm)-((8" * 25.4mm - 7" * 25.4mm)/2) = +10.3mm
This +10.3mm change occurs on each side of the vehicle, therefore the wheel track change is 10.3mm x 2 = 20.6mm.
And that is less that the maximum 25mm change in wheel track permited in NSW.

[Graeme]

Last I knew, track was the distance between the centres of the rims, not the outside edges!

[rmp]

Ahh, you are forgetting that the factory rim is 8" & the Dynamic Steel rim is 7".
Offset is calculated from the centre of the rim. And offset is the distance to where the rim is mounted to the hub. The two dimensions influence changes in wheel track.

The calc is as follows:
Factory +53mm offset on 8" rim width.
Alternate rim (say Dynamic Steelie) is +30mm on 7" rim.

The position of the outside edge of the alternate rim in relation to the factory position is calculated as:
(+53mm - +30mm)-((8" * 25.4mm - 7" * 25.4mm)/2) = +10.3mm
This +10.3mm change occurs on each side of the vehicle, therefore the wheel track change is 10.3mm x 2 = 20.6mm.
And that is less that the maximum 25mm change in wheel track permited in NSW.

Track in automotive engineering is the distance between the centrelines of the wheels, not the outside edges. Therefore, rim width makes no difference to the track, only the distance from outside edge to outside edge which is as you describe.

Therefore, a 30p offset is not in fact legal.

[Duck's Guts]

Graeme & rpm,

You are both bang on! I ****ed up ;).
Dynamic 7" steelies illegal alright.

[rmp]

Graeme & rpm,

You are both bang on! I ****ed up ;).
Dynamic 7" steelies illegal alright.

Well I should clarify...the track increase is more than 25mm so they are not roadworthy in NSW or Vic. Other locales may have different laws <insert standard rant about over-regulated Australia>

[TDV6]

Question? this is one I never seem to get right, but if LR is 53mm + and Dynamic is 30mm + (which is standard Holden I think) does this mean the track is 46mm less than standard LR?. If so this would make the vehicle more unstable.

26mm increase in QLD, no decrease allowed, see page 20 of http://www.transport.qld.gov.au/resources/file/ebde8d0521b67c6/Pdf_modification_motor_vehicles2.pdf

The wheel track must not be reduced to less than the
standard track specified by the vehicle manufacturer
for the particular model of vehicle.
The track of a car or car derivative may be increased
by up to 26mm beyond the maximum specified by
the vehicle manufacturer for the particular model of
vehicle.

Ryall

[gghaggis]

Confusingly, if the +ve value is reduced, that means the track is increased!

Hope that helps,

Gordon


Question? this is one I never seem to get right, but if LR is 53mm + and Dynamic is 30mm + (which is standard Holden I think) does this mean the track is 46mm less than standard LR?. If so this would make the vehicle more unstable.

26mm increase in QLD, no decrease allowed, see page 20 of http://www.transport.qld.gov.au/resources/file/ebde8d0521b67c6/Pdf_modification_motor_vehicles2.pdf

The wheel track must not be reduced to less than the
standard track specified by the vehicle manufacturer
for the particular model of vehicle.
The track of a car or car derivative may be increased
by up to 26mm beyond the maximum specified by
the vehicle manufacturer for the particular model of
vehicle.

Ryall

[Preacher]

Thanks Guys, yes I haved checked other threads which verified they are legal in Vic (and need special D3 wheel nuts) so has anyone feedback on the steel Dynamic rims?

cheers
John

Just purchased 6 from Dynamic and had them include appropriate nuts with them - havn't fitted them as yet - fitting 265 70 17 maxiss bighorns
dj

[Blue C]

I have just returned from 5,500 km trip from Adelaide to Darwin via Oodnadatta track, Finke, Red Centre, Mereenie Loop & then Stuart Highway on new Dynamic 17x7 steel rims with Cooper STT's 245/70/17's fitted. I bought 6 rims but did not need either spare. The tyres performed very well however I had constant vibration at 80-110km/hr (front & rear) despite having all wheels balanced now a total of 4 times! It was not doing this on stock 19'' alloys immediately prior (at just 4000kms) in May. I am about to put factory 19'' alloys back on whilst my Cooper agent investigates the 17" tyres/rims. However I am wondering if it's a rim issue. I have heard from a local 4x4 agent that the Dynamic 17x8's have been withdrawn due to vibration issues. Does anyone else have any clues or knowledge of 17 x7 Dynamic steel rim vibration problems on D3's?

[gghaggis]

I ran them as my daily rims fitted with Mickey Thompson ATZ's and had no issue. However, a client of mine had some vibration problems on BFG's. Both were 265/70/17 size.

Cheers,

Gordon