OV9

Jobbo wrote: Fri Sep 29, 2023 11:26 am

Rich B wrote: Fri Sep 29, 2023 11:13 am I'm fairly convinced on the suggestion. I've driven it to work today and I went over some bumps that do look like they have the ability to wear the inner tyres.

But only on BMWs... I think this is a bit of a red herring. Plenty of BMW drivers find the inside of the rears are worn down to the cords; it can't solely be one manufacturer's cars reacting to a specific type of speed hump can it?

who said it was only on BMWs? I'm just presuming it's the track width matching it, not helped by runflat 19s on a 35 sidewall that doesn't have much flex.

Rich B wrote: Fri Sep 29, 2023 11:42 am

Jobbo wrote: Fri Sep 29, 2023 11:26 am

Rich B wrote: Fri Sep 29, 2023 11:13 am I'm fairly convinced on the suggestion. I've driven it to work today and I went over some bumps that do look like they have the ability to wear the inner tyres.

But only on BMWs... I think this is a bit of a red herring. Plenty of BMW drivers find the inside of the rears are worn down to the cords; it can't solely be one manufacturer's cars reacting to a specific type of speed hump can it?

who said it was only on BMWs? I'm just presuming it's the track width matching it, not helped by runflat 19s on a 35 sidewall that doesn't have much flex.

Your rear track width is c50mm wider than my E91, and the front track width about 30-40mm wider (your front track width is similar to the rear track on mine). Mine runs 225/4/18 and 255/35/18 but non-RFT. Not had an issue like this in 80,000 miles despite my commute requiring I go over a series of these (which look far more knackered these days than the ones you posted a pic of). Never had any issues on either of the wife's E8x or F2x 1-series either, both of which ran staggered RFT setups.

I'm not saying it's definitely not the cushions, but I'm with Jobbo in that I reckon it's just a red herring.

Swervin_Mervin wrote: Fri Sep 29, 2023 12:07 pm

Rich B wrote: Fri Sep 29, 2023 11:42 am

Jobbo wrote: Fri Sep 29, 2023 11:26 am
But only on BMWs... I think this is a bit of a red herring. Plenty of BMW drivers find the inside of the rears are worn down to the cords; it can't solely be one manufacturer's cars reacting to a specific type of speed hump can it?

who said it was only on BMWs? I'm just presuming it's the track width matching it, not helped by runflat 19s on a 35 sidewall that doesn't have much flex.

Your rear track width is c50mm wider than my E91, and the front track width about 30-40mm wider (your front track width is similar to the rear track on mine). Mine runs 225/4/18 and 255/35/18 but non-RFT. Not had an issue like this in 80,000 miles despite my commute requiring I go over a series of these (which look far more knackered these days than the ones you posted a pic of). Never had any issues on either of the wife's E8x or F2x 1-series either, both of which ran staggered RFT setups.

I'm not saying it's definitely not the cushions, but I'm with Jobbo in that I reckon it's just a red herring.

I've not had the issue on my M2 either, despite treating speed humps the same. Maybe there's a runflat factor too with stiffer sidewalls?

Rich B wrote: Fri Sep 29, 2023 11:42 am who said it was only on BMWs?

I did. You see people with BMWs on forums regularly saying they've worn the inside of rear tyres, but not other makes particularly. Seems to be a theme. You've owned enough BMWs so surely you've seen this mentioned before?

Not all BMWs, obviously - I've never had it happen to mine. But pretty much every time I've seen someone talk about it, it's been a BMW.

Had the same happen on my 6 Series resulting in a blowout, the rears only lasted 6000 miles. Took it to 3 places and all said nothing wrong with the suspension. My tyre fitter said the harder less giving sidewall on the runflats can exacerbate the problem. Changed to PS4S and about 10,000 miles later they're still wearing evenly.
Weirdly this wasn't nearly as much of an issue when my mum used to drive it. Still the inner shoulders wore but she got far more mileage out of them which made me think the suspension must be knackered.

McSwede wrote: Thu Sep 28, 2023 8:49 pmStraddling speedbumps?? One of my younger team members has loads near his house and has killed the tyres on his Audi in what looks like the same way.

apart from one of the very first replies to the query!

On searching last night I saw plenty of Mercedes threads too with the issue. I wonder if it affects cars with bigger wheels with runflats (and the sort of people who post on car forums, so not the average Vauxhall/gashqai/spam chariot owner).

In the end, I can't confirm it is the issue - so no point in concluding it until we've tried not straddling speed bumps for a year!

Holley wrote: Fri Sep 29, 2023 10:12 am

Mito Man wrote: Fri Sep 29, 2023 12:33 am Yes, Performance model pre heat pump - its lifetime average is 312w per mile which about is what they all seem to achieve.

Is that just because it's a performance model? My LR has averaged 244w per mile over 2 years (currently averaging 211w) and 30k miles. Getting 300+ miles out of it is pretty easy. Was thinking about maybe getting the performance model next year, but not if the efficiency is that much lower.

I assume it's the non aerodynamic wheels and tyres as other than that it's the same as a LR. It used to do 240 miles when new.
BYD Seal looks like an interesting Model 3 alternative. It has LFP batteries on all of its models which are rated for 5000 cycles vs the 1500 cycles on longer range Teslas
https://www.byd.com/uk/car/seal

Also quick lunch time Mito fiddle.
The mouse didn’t take the bait which I placed last night.
However it now smells like shit.
Removed the filter and ran the fan.

Fuck sticks
Shit everywhere.

Also blower still sounds like a bag of nails so I’ll have to remove it. There’s really not much access after that and I’m hoping I don’t need to go much deeper. Fucking little cunt.

Surely it would have been between engine bay and motor, but now you’ve taken the filter out and blown crap everywhere?

The motor is notoriously not very well filtered, I had to empty a load of leaves out of mine at one point because it sounded horrendous!

I can't see anything from the engine bay side!
There was crap both sides of the cabin filter despite no hole in the actual filter and I can't get a vacuum in. I'll remove the fan later this evening.

Rich B wrote: Fri Sep 29, 2023 1:21 pm

McSwede wrote: Thu Sep 28, 2023 8:49 pmStraddling speedbumps?? One of my younger team members has loads near his house and has killed the tyres on his Audi in what looks like the same way.

apart from one of the very first replies to the query!

On searching last night I saw plenty of Mercedes threads too with the issue. I wonder if it affects cars with bigger wheels with runflats (and the sort of people who post on car forums, so not the average Vauxhall/gashqai/spam chariot owner).

In the end, I can't confirm it is the issue - so no point in concluding it until we've tried not straddling speed bumps for a year!

That's one anecdote, not data. Google 'inner rear tyre wear' and the results are predominantly BMWs. I would be more inclined to think that RFTs are the cause than speed humps, since as you say M-cars tend not to suffer. I have always replaced RFTs on my BMWs with normal tyres and never suffered it either.

Rich B wrote: Fri Sep 29, 2023 1:00 pm

Swervin_Mervin wrote: Fri Sep 29, 2023 12:07 pm

Rich B wrote: Fri Sep 29, 2023 11:42 am who said it was only on BMWs? I'm just presuming it's the track width matching it, not helped by runflat 19s on a 35 sidewall that doesn't have much flex.

Your rear track width is c50mm wider than my E91, and the front track width about 30-40mm wider (your front track width is similar to the rear track on mine). Mine runs 225/4/18 and 255/35/18 but non-RFT. Not had an issue like this in 80,000 miles despite my commute requiring I go over a series of these (which look far more knackered these days than the ones you posted a pic of). Never had any issues on either of the wife's E8x or F2x 1-series either, both of which ran staggered RFT setups.

I'm not saying it's definitely not the cushions, but I'm with Jobbo in that I reckon it's just a red herring.

I've not had the issue on my M2 either, despite treating speed humps the same. Maybe there's a runflat factor too with stiffer sidewalls?

Could be, albeit both our 1series were RFT equipped. I was also wondering if your speed cushions might have a higher friction coefficient if they're not a more traditional surface material. They look to be synthetic bolt ons (oo-er), whereas the ones near us are full construction. They would have had high friction surfacing as well but that disappeared years ago and they're now just tarmac.

Swervin_Mervin wrote: Fri Sep 29, 2023 2:50 pm

Rich B wrote: Fri Sep 29, 2023 1:00 pm

Swervin_Mervin wrote: Fri Sep 29, 2023 12:07 pm

Your rear track width is c50mm wider than my E91, and the front track width about 30-40mm wider (your front track width is similar to the rear track on mine). Mine runs 225/4/18 and 255/35/18 but non-RFT. Not had an issue like this in 80,000 miles despite my commute requiring I go over a series of these (which look far more knackered these days than the ones you posted a pic of). Never had any issues on either of the wife's E8x or F2x 1-series either, both of which ran staggered RFT setups.

I'm not saying it's definitely not the cushions, but I'm with Jobbo in that I reckon it's just a red herring.

I've not had the issue on my M2 either, despite treating speed humps the same. Maybe there's a runflat factor too with stiffer sidewalls?

Could be, albeit both our 1series were RFT equipped. I was also wondering if your speed cushions might have a higher friction coefficient if they're not a more traditional surface material. They look to be synthetic bolt ons (oo-er), whereas the ones near us are full construction. They would have had high friction surfacing as well but that disappeared years ago and they're now just tarmac.

they're all different round here - I'm sure there some tarmac ones with chunks taken out of the leading edge of the corner too.

We'll see. We're changing our approach to them from now on...

I know the X5 M50d used to get abnormal wear on the inside edge of the wheels.. I’d assume increased -ve camber on BMW’s, especially on M-sport models, than traditionally AWD Audis or non drivers-car Mercedes. Plus rfts may mean they don’t flex and hence spread the load over more area of the tyre.

Go-pro and drive over a couple of cushions may be a quicker answer than waiting to see how these tyres wear..

Got the Mito fan opened up and found a bolt the mouse had stashed away there! Also what prick uses 5.5mm bolts. Had to lock through 4 toolboxes to find a set which went up in .5 increments.

Didn’t find the mouse though… All the pipe work is made of translucent white plastic so shining a torch through showed it to be clear. I can’t check the engine bay side properly without removing the scuttle panel which needs a tool to pull the wipers off but it looked clear from below.
Used an AC bomb but now it smells like a public toilet which someone has sprayed aftershave in

Also after thinking I bricked the Tesla it actually came back to life with a health figure… phew
So it’s only lost 8kwh. I wonder how much that equates to in BHP as it seems to be mainly a function of how fast you can drain the batteries on an EV?

It must have a fair bit of reserve below what it claims to be 0% range then, however iirc the warranty states that you can void it if you go to 0 so not sure how useful that hidden range is in reality.

I opened the bonnet on our motorhome for the first time in months yesterday and found rat droppings on the top of the engine

No sign of any chewed bonnet insulation or wires so I'm hoping it was a fleeting visit, wishful thinking maybe. I've purchased an ultrasonic thing and a bottle of peppermint oil which rats and mice apparently dislike. At least it'll smell better than the chemical toilet fluid

Ohh now I'm wondering if that grey foam is from underneath the engine cover as I think BMW use something similar there. I can't remember what the Mito has, if anything.

Mito Man wrote: Fri Sep 29, 2023 7:35 pm Also what prick uses 5.5mm bolts. Had to lock through 4 toolboxes to find a set which went up in .5 increments.

Alfa being Alfa....you don't stand out by being part of the standard fitting crowd I had similar on the 4C, can't remember what I was trying to remove but I'd got nothing in my toolset which fit; neither had my BIL so had to order one in.

Shoddy garage work, failing to fix a simple handbrake issue on the compact (which I will now do myself this weekend) means that the Defender has been in daily duties this week.

It always surprises me how many people look at it in London, and make positive comments (makes and female) - two yesterday in different locations within half an hour while I sat in it waiting for my engineer.
It’s going up for sale next month - Anyone want a 36,000 mile 2012 Defender?

Looks lovely. I’d love it, but have no way of affording it, want to swap for a tiny shonky Renault?