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Discussion Starter · #1 ·
So on my way out of the village this morning some guy in a transit van felt the need to encroach on my side of the road - as such I had to take avoiding action and hit the front left HARD on the kerb. It felt and sounded horrendous and my heart instantly sank...

I pulled over to see how bad the damage was, and to my great surprise and relief it was fine. I have the 21's with Dunlop rubber, and I knew they had a special protective lip to prevent kerbing but I figured it was more for brushing the kerb when parking rather than ramming it at 30mph!
The tyre protrudes beyond the rim 3-4mm, and it wrapped this lip around the edge of the alloy, leaving a 3-4 inch rubber mark, but no scratches!

So while I am not planning to do this again, I can report the Dunlop rim protection system is very impressive!
 
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The edge normally just rips off - they are the same on most Audis (regardless of tyre brand).
This is why i wouldn't go with 21s - need want the extra height to avoid kerbstones.

Sounds like you have a lucky escape - nothing worse than that noise.
 

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The edge normally just rips off - they are the same on most Audis (regardless of tyre brand).
This is why i wouldn't go with 21s - need want the extra height to avoid kerbstones.

Sounds like you have a lucky escape - nothing worse than that noise.
Not so on the A5 cabriolet on loan to me.
 

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I always try and buy tyres with rim protectors. There is also a product called alloygator which is sticking a rubber ring around the tyre to protect them. I have never used them, but website is below.

http://www.alloygator.co.uk/

 

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You were so lucky ,to avoid damage,you must have still had that gut wrenching feeling caused bi the dreaded kerbige,you've used 1 of your kerbige lives ,lol 😄
 
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When I saw the topic heading I thought the worse for you. Pleased that it turned out ok. Interesting to learn about the rim protection.
 

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Sounds like you had a lucky escape. I don't wish to cause unnecessary alarm, but feel obliged to mention tyres can be damaged internally, with no apparent external damage and blow out some time after the event. You might want to keep a close eye on that tyre.
 

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My understanding is the "lips" are a function of tyres that are rated as having a reinforced wall, its not meant as a wheel protection.
Maybe the tyre people on the forum could confirmed??
 

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Discussion Starter · #9 ·
Sounds like you had a lucky escape. I don't wish to cause unnecessary alarm, but feel obliged to mention tyres can be damaged internally, with no apparent external damage and blow out some time after the event. You might want to keep a close eye on that tyre.
Yea I know - I did think this as well. It was a massive thump, I am half expecting to come back to a flat at the end of today.
 

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I was just going on mine on the drive - the ones with the lips are re-inforced (all different brands) the one without a lip is not re-inforced.
maybe the dunlop ones are not soft like those on my pirellis that just peeled off when i hit a kerb (resulting in a tyre and a wheel being needed)
 

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I was just going on mine on the drive - the ones with the lips are re-inforced (all different brands) the one without a lip is not re-inforced.
maybe the dunlop ones are not soft like those on my pirellis that just peeled off when i hit a kerb (resulting in a tyre and a wheel being needed)
As far as I can work out there are different levels of rim protection, MFS and FSL/FR. MFS has the word 'max' so I am assuming is better than FSL/FR!?

The Pirelli 255/40/21's have FSL, the Dunlops MFS. Might just be brand naming for the same thing, but they appear to be 'standard' tyre markings on many sites...
 

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From what I have gained over the years is that rim protection can be provided with or without reinforcing. Rim protector tyres tend to have vertical rather than curved sidewalls. This means that they are stiffer and less comfortable, but will provide for better steering.

Reinforced tyres, rim protection or not, tend to have thicker sidewalls to cope with the extra load of the vehicle. I think rim potection was not a deliberate design creation but as spin off from creating a more rigid sidewall to improve steering response.

A bit like viagra which was developed to dilate the blood vesssels for those who were at risk of blood clotting/stroke
 
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Damage would of been little difference if on 20"
Example
R8 Side wall height on 235/35/19 Tyre 152mm
SQ5 Side Wall height 235/45/20 Tyre 129mm
SQ5 Side wall height on 255/40/21 Tyre 153mm
Glad all is well.
 

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Discussion Starter · #15 ·
So drove 30 miles and the TPMS went mental. SHIT I thought!
Stopped, got the pump out (which incidentally is awesome!).
Both fronts were 2-3 psi low, rears were perfect, so not sure why it triggered.
Hoping its a glitch where the knock upset it (any thoughts on making this theory stack up)?
Not sure if it has actual sensors in the wheel or goes on rolling radius (I assumed the latter based on the low price and so it must be software option to alert if the ABS sees one wheel is smaller...).

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I would have thought it was on rolling radius because when I've changed wheels in the past 2 upsize ,the tpm have always still worked,but that was on range rovers,and there tpm price was over £275, Audi price tpm seems exceptionly cheap í ½í¸„
 

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Jose, Normally if tye TPS goes off, the MMI tells you which wheel is sending the signal. it does this on my A7. I had a puncture recemtly on the M3. I got out, checked the tyres visually and all looked ok, so drove off again after having reset the pressures on the MMI and after a few miles it went off again. Lesson learnt is to wait a while as the air escapes. In your case maybe the the tyre rubber shifted from the rim temporarily and reseated itself. Check the pressures again tonight.
 

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Discussion Starter · #19 ·
Jose, Normally if tye TPS goes off, the MMI tells you which wheel is sending the signal. it does this on my A7. I had a puncture recemtly on the M3. I got out, checked the tyres visually and all looked ok, so drove off again after having reset the pressures on the MMI and after a few miles it went off again. Lesson learnt is to wait a while as the air escapes. In your case maybe the the tyre rubber shifted from the rim temporarily and reseated itself. Check the pressures again tonight.
I'm hoping it let a but if air out and isn't a slow leak from a cracked rim!
I don't think it said which wheel it was... But then I didn't take much notice as assumed it was the one I hit.
The A7 has much newer electronics than the Q5 so it may be a bonus on that model as well.

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I'm hoping it let a but if air out and isn't a slow leak from a cracked rim!
I don't think it said which wheel it was... But then I didn't take much notice as assumed it was the one I hit.
The A7 has much newer electronics than the Q5 so it may be a bonus on that model as well.

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Put 40psi in don't drive and leave it overnight check in the morning.
 
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