Member Since: 20 Sep 2010
Location: Israel
Posts: 160
31.5" wheels
I have 265/65/18 tyres for off-roading and my question is if the air suspension fails completely will I still be able to drive the car? Using my mudtech kit (-3 Cm) I can still get into access mode with a little space left but maybe the bump stops are even lower?
19th May 2020 3:56 am
Kenny57
Member Since: 12 Apr 2020
Location: Essex
Posts: 173
That's an excellent question as I've just squeezed a set of 32" ones onto mine. At the moment I'm reluctant to even go into access-height as it looks like the tyres might "rest" on the inner wheel arches.
Last edited by Kenny57 on 17th Sep 2020 8:18 pm. Edited 1 time in total
19th May 2020 5:49 am
Zack
Member Since: 04 Feb 2018
Location: Ripon, North Yorkshire
Posts: 72
I was looking at this exact thing yesterday and posted it on another topic but here you go...
I’m getting some larger tyres fitted so decided to measure the car at different heights to check for clearance. The measurements below are from the ground to the top of the inner side of the wheel arch.
Current tyres are 255 55 R19
Bump stops 825mm
Access 850mm
Normal 900mm
Off-road 950mm
These aren’t exact so don’t blame me if you drop to access height and your wheel arches don’t!
21st May 2020 8:31 am
cestor
Member Since: 20 Sep 2010
Location: Israel
Posts: 160
that doesn't look quite right as with my mudtech I can go down 3cm from access mode (not sure if it's then on the bump stops)
21st May 2020 9:05 am
Zack
Member Since: 04 Feb 2018
Location: Ripon, North Yorkshire
Posts: 72
You could be right. As I said it’s not 100% accurate and I could have been 5mm off.
21st May 2020 11:09 am
Kenny57
Member Since: 12 Apr 2020
Location: Essex
Posts: 173
Thanks guys, at least it gives us an idea.
21st May 2020 5:42 pm
gstuart
Member Since: 21 Oct 2016
Location: kent
Posts: 14129
Apologises for asking but where are the bump stops on the D3 please , are they the small plastic parts In the lower wishbones plse
Many thks
21st May 2020 10:38 pm
marsie
Member Since: 28 Feb 2010
Location: Sheffieldish
Posts: 1807
My 20" tyres work out at 31.2" and i can drive fine on the bumpstops on my d4 with no rubbing issues if that helps
Dropped mine with the IID tool just to check when i fitted my bigger tyresPrevious Discos
1989 200tdi 3dr
1994 300tdi ES
1995 3.9 ES (x3)
2000 4.0 adventurer
2001 4.0 ES
2005 D3 HSE (zambesi silver)
2007 D3 SE (Lugano teal)
2011 D4 XS (Baltic Blue)
2008 D3 HSE PREMIUM (buckingham blue)
2009 D4 XS (Nara bronze)
2006 D3 Metropolis (Java Black)
2012my D4 HSE (indus silver)
2013 D4 XS (Firenze red)
Current 2017 D5 first edition (silicone silver)
6th Jun 2020 7:03 am
Kenny57
Member Since: 12 Apr 2020
Location: Essex
Posts: 173
gstuart wrote:
Apologises for asking but where are the bump stops on the D3 please , are they the small plastic parts In the lower wishbones plse
Many thks
Not sure if you ever got an answer to that, but if not I'll try. The bump stops are actually inside the air rams. If you are familiar with the bump stops on an adjustable coil over damper, they're much like that. If not, think rubber dohnut around the shaft to stop it closing fully metal to metal at minimum length. So with no air pressure in it, the ram simply gets shorter until the lower part sits against a rubber(ish) ring inside the upper part.
I actually did try it with my 32" tyres on. At the back there is still an inch or two clearance to the inner arch, but at the front it the tyre just touches. Turning the wheel only makes this worse. It would make for a very uncomfortable and probably very damaging journey if forced to drive with the rams on their bump stops. My solution has been to fit spacers above the rams to give enough clearance to make it drivable in this condition. I'm also considering fitting a "manual inflate" system for the rams. It wouldn't fix a leaking ram, but it would overcome an EAS module that was deliberately lowering it for some other reason.
Hope that helps
19th Oct 2020 4:36 pm
gstuart
Member Since: 21 Oct 2016
Location: kent
Posts: 14129
Hi @kenny
Many thks for that and very grateful , did see this ref the strut
Hope u find a simple fix for ur tyres without too much agro
Thks again for taking the time to explain it
20th Oct 2020 1:26 pm
Kenny57
Member Since: 12 Apr 2020
Location: Essex
Posts: 173
You're very welcome. And thank you for the link, that might come in very useful. For the moment I'm limiting myself to spraying PlusGas on every major suspension nut and bolt every time I happen to be under the car. Hoping it will pay off when I eventually get round to replacing stuff
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