TYRES AND BLOWOUTS

Technical questions and answers about the Mazda Bongo

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richlizard
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TYRES AND BLOWOUTS

Post by richlizard » Wed Jan 27, 2010 6:46 pm

Hello bongo people. Please excuse my first post asking for help but if I didn't need help I wouldn't have known this site existed so hopefully I will visit regularly and get to meet some of you at live bongo events.

I should point out I am useless. I always liked the idea of campervanning and since buying my converted bongo at the beginning of 2009, we have actually used it more than I anticipated we would. With the exception of the cooker that is... we can't have that getting all dirty!!

So what I am saying really is I know nothing about shafts and bearings and techie stuff and to put it bluntly if you put an alloy in front of me and a bicycle tyre, I couldn't tell you which was the alloy! :shock:

Anyway, waffling already. Sorry if the below is a bit drawn out and disjointed (even more than above) as I am copying it from my own web site full of poker players where they naturally want things to be exagerrated to help the story. Anyway, I am hoping the symptoms described might help someone point me in the right direction as to what is going wrong and what I ought to do.

Incidentally, this was only my second journey of any great distance. The first time I had a blowout I was travelling 80mph and this time maybe 65mph. I don't know if having bigger wheels fitted would help or the speed is completely irrelevant?

Thanks in advance...

As I turned onto the motorway, the bongo started to feel a little sort of bouncy and slidey. I thought the road was all bumpy at first, but then remembered the Poker Million party and figured I better check the tyres. On that occasion, I had been on a TILT spring up the A303 so it was understandable. But I now never speed anywhere so surely not? I pulled on to the hard shoulder and was relieved to see nothing untoward. But still felt uneasy about my future. Not a good sign.

Back on route, things felt worse than ever. They musta done some serious roadworks on this road 'cos the bongo is bouncing around like a goodun. So it must be something wrong with the engine and as soon as I started thinking this I noticed a yellow warning light on the dashboard. I peered forwards and squinted at the symbol and it said something like ABS. Now even I know this means the brakes and I thought oh my gawd, are the brakes working? I was soon to put that to the test. Bang, flap, crash, flip, slide, etc and I noticed my tyre flying all across the motorway. The bongo was skidding from side to side amongst the lorries and speeding cars and avoiding them was like getting thru a Scandi freeroll. Eventually, I scraped to a halt on the hard shoulder.

My second contingency plan was to bring my air compressor. I don't think it was gonna pump up!

So now we are in trouble. I had a 3rd contingency plan by bringing my breakdown policy with me The only problem is the iphone isn't working, the nokia is pretty much dead and I have no idea where I am or what to do. It crossed my mind to move the sim from iphone to Nokia but of course there is a special little tool needed to extract the sim and little chance of ever finding that thing again. So I guess I gotta wander the motorway looking for a breakdown phone. A few hundred yards down the road and a little post had a phone symbol on it and an arrow. So where is it then? I looked all round it and even inside it. There was no phone. Someone musta nicked it
A few more posts and the phones were missing from ALL of them. Lot of thieves around here. Eventually of course, I realised that the little arrows were all pointing me in the direction I had to walk to get to the main phone. On this occasion, approx. 2 miles in the opposite direction. The freezing rain helped sober me up but a nice cup of coffee could have done the same thing I am sure. After finding the phone and spending some time trying to hear anything due to the rain, wind and thunderous traffic, they eventually got in touch with my recovery service and said they would be there within an hour and to stay out of the vehicle. Yeah right!

True to their word, they arrived probably 59 minutes later!!

Now getting the bongo fixed was one thing. Getting home on a bicycle wheel was another. That's pretty much what the spare wheel is on the bongo and I was advised travelling 120 miles on this wheel to stick to 40mph. My God it was painful and actually felt like I WAS on a bike as all lorries and even smart cars and joggers were overtaking me.

By now I was completey wrecked. I have no idea how long the journey took but I know I spent most of it holding apart my incredibly stinging eyelids. I actually enjoy driving. Today may have scarred me for life.


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missfixit70
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Re: TYRES AND BLOWOUTS

Post by missfixit70 » Wed Jan 27, 2010 6:59 pm

If you've had 2 blowouts (is that right? - it's all a bit garbled) I reckon your tyres are maybe old an/or underrated.
There is a fact sheet explaining about the tyre ratings in the members area, but basically they need to be a minimum of 96S on the rear & 92S on the front, or possibly even 98S, it'll tell you on the little panel on the inside of the door pillar.
As regards the spare tyre, get a full size spare wheel from a breakers or someone on here & fit that as your spare, the wheelbarrow tyre is useless & dangerous as it is probably past it's sell by date & you're only supposed to do a max of 50mph for a max of 50 miles.
If you have an ABS sensor flashing, you need to get that sorted, could just be crud in the sensor, but as it seems you a mechanically hopeless (by your own admission) :wink: I'd get it to a bongo friendly garage (list in the members area) to get it checked out properly, I guess it could be malfunctioning with disastrous results.
Have you got 4wd, what size wheels have you got ie 15inch, 17inch, etc & what are all the numbers on the side of the tyres? are they different sizes front & back?
Last edited by missfixit70 on Wed Jan 27, 2010 7:26 pm, edited 1 time in total.
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wormey
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Re: TYRES AND BLOWOUTS

Post by wormey » Wed Jan 27, 2010 7:25 pm

Perhaps I've been lucky, but, I have only ever had one blow out. This was on the M5 and I could feel the tyre bumping along the road. Being young I had no idea what was happening until it went bang.

I agree with missfixit70,

Happy travels :D
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Re: TYRES AND BLOWOUTS

Post by technophobe » Wed Jan 27, 2010 7:41 pm

Wow :!: :shock: Who's a lucky person. You couldn't do better than follow Kirsty's advice.
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Re: TYRES AND BLOWOUTS

Post by richlizard » Thu Jan 28, 2010 12:00 am

missfixit70 wrote:If you've had 2 blowouts (is that right? - it's all a bit garbled) I reckon your tyres are maybe old an/or underrated.
There is a fact sheet explaining about the tyre ratings in the members area, but basically they need to be a minimum of 96S on the rear & 92S on the front, or possibly even 98S, it'll tell you on the little panel on the inside of the door pillar.
As regards the spare tyre, get a full size spare wheel from a breakers or someone on here & fit that as your spare, the wheelbarrow tyre is useless & dangerous as it is probably past it's sell by date & you're only supposed to do a max of 50mph for a max of 50 miles.
If you have an ABS sensor flashing, you need to get that sorted, could just be crud in the sensor, but as it seems you a mechanically hopeless (by your own admission) :wink: I'd get it to a bongo friendly garage (list in the members area) to get it checked out properly, I guess it could be malfunctioning with disastrous results.
Have you got 4wd, what size wheels have you got ie 15inch, 17inch, etc & what are all the numbers on the side of the tyres? are they different sizes front & back?
Hi Kirsty and thanks for your response.

Correct, two blowouts. Both on similar long journeys and different rear wheels.

I am afraid although I tried to explain how naive I am, I have no idea what 96S etc means. I did look at the little panel inside the door some time back but nothing seemed to relate. It was all Japanese and the figures for air pressure I guessed would be around 30 somethings per something. But I saw no figure near 30.

If I get 2 new wheels for the back I will use an old one for the spare. I figured a space-saver was used because there was no space to fit a real wheel beneath. Obv not. What a dumb idea that is then.

The ABS was only flashing before the blowout and not after my bike wheel was fitted so I figure it was trying to tell me something.

Ok, I will look for nearest Bongo friendly garage and have a chat with them.

I don't think it is 4wd as it is only 2 litre. I will look tomorrow at the numbers on the tyres and get back to you.

Again, thanks for the advice. :D
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Re: TYRES AND BLOWOUTS

Post by MountainGoat » Thu Jan 28, 2010 12:08 am

Not surprised that you had a second Blow Out using the Space Saver spare wheel. they are leathal, well past their sell by date and even within have speed and distance restrictions on their usage. Everyone in the know throws them away and replaces them with a full size spare for which there is plenty of room in the spare wheel bay under the Bongo.

No doubt Kirsty will be along soon to issue you with further instructions.

Tony
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Re: TYRES AND BLOWOUTS

Post by richlizard » Thu Jan 28, 2010 1:14 am

MountainGoat wrote:Not surprised that you had a second Blow Out using the Space Saver spare wheel. they are leathal, well past their sell by date and even within have speed and distance restrictions on their usage. Everyone in the know throws them away and replaces them with a full size spare for which there is plenty of room in the spare wheel bay under the Bongo.

No doubt Kirsty will be along soon to issue you with further instructions.

Tony
I didn't Tony. The space saver has got me home - albeit rather slow - on each occasion.

The occasions were months apart.
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Re: TYRES AND BLOWOUTS

Post by brorabongo » Thu Jan 28, 2010 1:22 am

A wee bit of info on tyre ratings.....

http://www.blackcircles.com/general/sidewall

If your load ratings were too low, that could cause blowouts?
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Re: TYRES AND BLOWOUTS

Post by francophile1947 » Thu Jan 28, 2010 1:04 pm

richlizard wrote: I guessed would be around 30 somethings per something. But I saw no figure near 30.
:? If you've been running your rear tyres at 30psi, they are well under-inflated and may well overheat and blow :shock:
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Re: TYRES AND BLOWOUTS

Post by thepickles » Thu Jan 28, 2010 2:21 pm

Sorry to hijack the thread :-" :-" :-" :-"

I have 225/45x18 91 on the front and 235/40x18 95 on the rear I take it I can get away with these load ratings ?? as they are as near as dammit to manufactures load ratings

and I run them at 40psi is that correct

awaiting the debate :roll: :roll: :roll:

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Re: TYRES AND BLOWOUTS

Post by missfixit70 » Thu Jan 28, 2010 3:11 pm

thepickles wrote:Sorry to hijack the thread :-" :-" :-" :-"

I have 225/45x18 91 on the front and 235/40x18 95 on the rear I take it I can get away with these load ratings ?? as they are as near as dammit to manufactures load ratings

and I run them at 40psi is that correct

awaiting the debate :roll: :roll: :roll:

cheers
Steve :D :D
The stated MINIMUM is 92 on the front & 96 on the rear (98 in some cases, relative to tyre size, should say on the plate on your door panel), you may be just below the limit, you may be a fair bit below, read the info provided in the link above & on the tyre factsheet in the members area. What you have to consider is, are they up to the job of handling the weight & speed of the bongo (nearly 2 tonnes) with your loved ones in it & anyone else that may get involved if it goes wrong? those little patches of rubber are the only thing that sticks you to the road, do you want to be wondering if you're going to "get away with it". Other than that, there are insurance implications of course if something does happen & the tyres are underrated
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Re: TYRES AND BLOWOUTS

Post by thepickles » Thu Jan 28, 2010 3:30 pm

missfixit70 wrote:
thepickles wrote:Sorry to hijack the thread :-" :-" :-" :-"

I have 225/45x18 91 on the front and 235/40x18 95 on the rear I take it I can get away with these load ratings ?? as they are as near as dammit to manufactures load ratings

and I run them at 40psi is that correct

awaiting the debate :roll: :roll: :roll:

cheers
Steve :D :D
The stated MINIMUM is 92 on the front & 96 on the rear (98 in some cases, relative to tyre size, should say on the plate on your door panel), you may be just below the limit, you may be a fair bit below, read the info provided in the link above & on the tyre factsheet in the members area. What you have to consider is, are they up to the job of handling the weight & speed of the bongo (nearly 2 tonnes) with your loved ones in it & anyone else that may get involved if it goes wrong? those little patches of rubber are the only thing that sticks you to the road, do you want to be wondering if you're going to "get away with it". Other than that, there are insurance implications of course if something does happen & the tyres are underrated
Thanks

I have been to the members area and the fact sheet states

'So a load rating of 96 means that a tyre can safely carry 710 kg, so 4 tyres will
support 2,840 kg. And as the Bongo weighs 1,860 kg unladen, this means there
is lots of spare capacity.'


My tyres add up to 2610 Kg leaving 750 Kg spare capacity so am I OK :?: :?: :?:

The recommended 92 and 96 add up to 2680 Kg leaving 820 Kg

so there is only 70 Kg difference

cheers
Steve :D
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Re: TYRES AND BLOWOUTS

Post by missfixit70 » Thu Jan 28, 2010 3:35 pm

Only you can answer that one, you've read the info.
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Re: TYRES AND BLOWOUTS

Post by thepickles » Thu Jan 28, 2010 3:37 pm

missfixit70 wrote:Only you can answer that one, you've read the info.
Kirsty

Only stating the Facts :wink:

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Re: TYRES AND BLOWOUTS

Post by rapiddescent » Thu Jan 28, 2010 3:51 pm

I don't seem like a total nerd, but the post a few above mistakes "weight" and "mass". The arithmetic above assumes the vehicle is stationary. - of course, they aren't, the bongo's are bongo'ing along into and out of dips and the tyres take pressure round corners.

example 1:
entering a dip - like the ones on the A93 near spittal of glenshee. the bongo will "weigh" 1.3 times its mass as it hits the bottom of the dip. the tyres not only are taking mass x gravity (but are also got the upwards acceleration of hitting he upswing in the road). If you manage to get the bongo off the ground, or are travelling faster, then the forces increase dramatically! For the non-rally drivers: hitting a square edged sleeping policeman, or kerb, at 30mph may also exert a similar force on the tyre,

example 2:
moose avoidance manoeuvre; basically, two outside cornering tyres will be taking 75% of the weight loading of the vehicle.
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