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Lupine Lacuna
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PostPosted: 16:03 - 17 Jun 2012    Post subject: Blowout Reply with quote

What are the consequences of a blowout on a motorbike? Disasterous? Ie,much worse than a car?

What can be done to eradicate all of the risk of the factors under your control?
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anthony_r6
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PostPosted: 16:06 - 17 Jun 2012    Post subject: Reply with quote

Front wheel goes at motorway speed, it's not going to be pretty.

For you, I'd recommend popping a wheelie and riding one wheel to a stand still. Someone of your 1337 status would have no trouble reacting to a blow out with a wheelie Thumbs Up
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Marmalade
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PostPosted: 16:08 - 17 Jun 2012    Post subject: Reply with quote

I a tyre is in a position to have a blow out there is nothing you can do to avoid. No tyre foam or puncture sealant is going to do anything.

If rear one goes you'll usually stay on, if in a very rare case a front gives out you'll be be coming off.
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Tenantry13
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PostPosted: 16:16 - 17 Jun 2012    Post subject: Reply with quote

Got new tyer two weeks ago before the IOM last one had two punctures in it that had be repaired. Had been riding that one for a while but thought I'd better get it sorted before my trip.

Now back and 2nd day got a screw in my new rear tyer. Not happy had it repaired for £10. Still not a happy chappy. Blow out could happen but can't afford a new tyer atm.
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salty21
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PostPosted: 16:33 - 17 Jun 2012    Post subject: Reply with quote

i had the rear blow out on the SP-1 at about 60mph after the front wheel flicked up a piece of slate and wedged it at a perfect angle under the rear tyre which left a 4 inch gash across it. It sounded like a firework going off and i thought i'd blown the engine or something.

Wasnt much drama at all to be honest, nowhere near as bad as you think it would be. I wouldnt fancy my chances if the front went at anything over 30mph though
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Fisty
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PostPosted: 16:39 - 17 Jun 2012    Post subject: Reply with quote

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Piercee100
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PostPosted: 17:00 - 17 Jun 2012    Post subject: Reply with quote

Had a rear blow on me whilst riding downhill flat out on my little H100 (about 70mph). The bang nearly gave me a heart attack followed by much side to side wobbling as I came to a stop. I felt that if I grabbed the brake I would have been thrown off so despite the shear terror of not knowing what what going on, I had to let it slow down of its own accord praying the whole time not to get thrown into the path of oncoming traffic.

The front would have been nasty.
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P.addy
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PostPosted: 17:54 - 17 Jun 2012    Post subject: Reply with quote

I crashed going round a corner when my tyre went from 40psi to 0 in a second Laughing Valve actually gave up, considered a blow out? Either way I got away with a scuff to my trousers at 60mph Laughing
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NeiljohnUK
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PostPosted: 18:03 - 17 Jun 2012    Post subject: Reply with quote

##Paddy## wrote:
I crashed going round a corner when my tyre went from 40psi to 0 in a second Laughing Valve actually gave up, considered a blow out? Either way I got away with a scuff to my trousers at 60mph Laughing


Valve failures seem to be a common problem recently, there was one in the BMW club mag last month (OK I'm an old fart, live with it, I do), he was lucky, it happen just as he parked up at the end of a ride. Dunno if it's bad installation technique (bike wheels are difficult using 'normal' car type tools, I've been a tyre fitter), or in his case one of those 'nut' type caps that's been over-stressing the rubber to brass bond, but I now replace my bike (and caravan) valves with bolt in metal bodied jobbies, even nippers 125 scooters got them!
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_matt
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PostPosted: 18:38 - 17 Jun 2012    Post subject: Reply with quote

had my rear innertube blow twice from nails and replaced it twice (both blows at low speeds, less than 20 mph so no trouble), i dont really know how this has affected the Tyre tho, seems fine after 7k miles and 2 blown tubes.
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Rogerborg
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PostPosted: 19:59 - 17 Jun 2012    Post subject: Re: Blowout Reply with quote

Lupine Lacuna wrote:
What are the consequences of a blowout on a motorbike? Disasterous? Ie,much worse than a car?

It's very awkward to arrange, you'd probably have to flip her upside down with her knees over your shoulders.

Lupine Lacuna wrote:
What can be done to eradicate all of the risk of the factors under your control?

Get one with a flat arse so that you can peek over it, and have some sort of pre-arranged signal in case she starts choking.
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garth
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PostPosted: 20:12 - 17 Jun 2012    Post subject: Reply with quote

I've had a rear go down to 0psi at 130, I'm still here.

I even rode it back home like it. That was entertaining.
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Walloper
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PostPosted: 03:33 - 18 Jun 2012    Post subject: Re: Blowout Reply with quote

Lupine Lacuna wrote:
What are the consequences of a blowout on a motorbike? Disasterous? Ie,much worse than a car?

I don't understand this question.

What can be done to eradicate all of the risk of the factors under your control?


Wrap up well in cotton wool or some other impact adsobing material and sit in the house with a SWAT team outside for good measure.
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EazyDuz
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PostPosted: 06:56 - 18 Jun 2012    Post subject: Reply with quote

garth wrote:
I've had a rear go down to 0psi at 130, I'm still here.

I even rode it back home like it. That was entertaining.


Is that a fact?
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Walloper
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PostPosted: 07:39 - 18 Jun 2012    Post subject: Reply with quote

EazyDuz wrote:
garth wrote:
I've had a rear go down to 0psi at 130, I'm still here.

I even rode it back home like it. That was entertaining.


Is that a fact?


To be accurate it was probably no less than 13 PSI (Atmospheric Pressure at Sea level.) Re: Sir Issac Newton, Editor 'Bikes and Biking' 1734)
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garth
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PostPosted: 07:50 - 18 Jun 2012    Post subject: Reply with quote

Alright smart arses, it went flat pretty fucking quickly, better? Laughing

It was a bit sketchy and had it been the front I would've gone down, but it's alot more controllable at the rear.
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c-m
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PostPosted: 08:06 - 18 Jun 2012    Post subject: Reply with quote

Had a front tyre blow out and produce a massive hole/tear about the size of a five pound note while doing 80mph on the autoroute.

Result was that the steering got very heavy and the handlebars shook.

Quite easily managed to slow down and pull over though, wasn't even a brown trousers moment. Fortunately the I was going in a straight line at the time.

I imagine a blowout from the sidewall would be different.
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Skudd
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PostPosted: 08:15 - 18 Jun 2012    Post subject: Reply with quote

Had a few rear blow outs with one being at 80mph two up. Just like riding on ice, Only had one go on the front but that wa low speed and was an oops and stop. All have been with tubed tyres.
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NeiljohnUK
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PostPosted: 10:42 - 18 Jun 2012    Post subject: Reply with quote

Thinking about it, 20 years ago I had a rear wheel go at 80 plus on a fully loaded R80RTIC (ex-job bike) two up, a bit like riding on ice, on the M62 at 8am on a bank holiday Monday. The RAC sent a man at ~9:30 with a van who took the wheel and returned it 'repaired' around 11:30. Refitted it and got as far as Holmes Chapel when it went down again on a roundabout. Two hours plus in a car dealers show room drinking coffee and this spec. lifter appears, put the bike across the speccys and back to Manchester to have it put on the oldest beaver-tail you've ever seen. Then wait for a driver to turn in for an hour or so, onto the M6 going North to go and refuel before finally heading home to Hampshire, M6 was bad, M5 was stuffed, so we navigated him across country through the Cotswolds and down through Salisbury plain, saving atleast 6 hours going by the traffic reports, finally off-loaded at 2am. Put the spare from my R60/6 in it for the last 1/2 mile home as he couldn't get near our place, numpty cagers blocking the road as usual, stripped the rim to find the tube pinched, arsehole tyre fitter had caused the second flat...

ALL the recent rear flats have been tubeless tyres with screws and other 'stuff' stuck in the tyre, so I reckon most if not all punctures are probably caused by lack of road cleaning, J5 M27 is a prime example, and builders etc not giving a dam about loosing stuff on the road these days. Avoiding filtering on areas where cages don't sweep helps!
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Kradmelder
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PostPosted: 10:51 - 18 Jun 2012    Post subject: Reply with quote

I would think most of them can be attributed to the rider's own fault:

Excessive wear on tyres
Underinflated tyres, which causes pinch out
Impacts with solid objects at excessive speed
Exceeding speed or load rating of tyre

So the best solution is prevention. Check your tyre pressures and adjust to the load and road conditions, don't ride your tyres down to the minimum tread depth

Dont buy cheapo tyres.
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Last edited by Kradmelder on 11:11 - 18 Jun 2012; edited 1 time in total
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NeiljohnUK
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PostPosted: 11:09 - 18 Jun 2012    Post subject: Reply with quote

Kradmelder wrote:
I would think most of them can be attributed to the rider's own fault:

Excessive wear on tyres
Underinflated tyres, which causes pinch out
Impacts with solid objects at excessive speed
Exceeding speed or load rating of tyre

Dont buy cheapo tyres.


1. Yes.
2. Possibly with tubes, modern radials handle like shit anyway if underinflated.
3. Hummm, solid objects, like timber and other stuff dropped on the road? Or 'bumping' over a kerb which fucks the casing internally and usually invisibly until it fails.
4. Only fools who shouldn't be on a bike, or the roads in general, dodgy tyre dealers may play a role though.

"So the post solution is prevention." Agreed.

"Check your tyre pressures and adjust to the load and road conditions" Difficult, most bigger bikes now state 36f/42r, loaded or unloaded, no matter what, but knowing and adjusting where relevant should be part of daily checks.

Cheapo tyres, no such thing for a lot of us, running big brand tyre's is often cheaper anyway due to better compounds and better wear rates!
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Kradmelder
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PostPosted: 11:17 - 18 Jun 2012    Post subject: Reply with quote

NeiljohnUK wrote:
Kradmelder wrote:
I would think most of them can be attributed to the rider's own fault:

Excessive wear on tyres
Underinflated tyres, which causes pinch out
Impacts with solid objects at excessive speed
Exceeding speed or load rating of tyre

Dont buy cheapo tyres.


1. Yes.
2. Possibly with tubes, modern radials handle like shit anyway if underinflated.
3. Hummm, solid objects, like timber and other stuff dropped on the road? Or 'bumping' over a kerb which fucks the casing internally and usually invisibly until it fails.
4. Only fools who shouldn't be on a bike, or the roads in general, dodgy tyre dealers may play a role though.

"So the post solution is prevention." Agreed.

"Check your tyre pressures and adjust to the load and road conditions" Difficult, most bigger bikes now state 36f/42r, loaded or unloaded, no matter what, but knowing and adjusting where relevant should be part of daily checks.

Cheapo tyres, no such thing for a lot of us, running big brand tyre's is often cheaper anyway due to better compounds and better wear rates!


I ride bigger bikes. I increase tyre pressure with a pillion or luggage, as well as the preload.

I also tend to ride about 0.1/0.2 bar higher than the manual for front/rear as it greatly increases tyre life. The manual was designed for all around general conditions for an average person. High speed tar you can inflate higher higher, dirt lower, and body weights differ. I'm stocky and musucular and heavier than the averager person the manual is written for, so I ride with a bit more pressure.


On gravel, you can under inflate, but then you are vulnerable to pinch outs if an impact. So I dont underinflate much and rather choose to ride a bit slower.

I carry a compressor on long trips so i can adjust my tyre pressures according to conditions.
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NeiljohnUK
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PostPosted: 12:16 - 18 Jun 2012    Post subject: Reply with quote

Kradmelder wrote:

I also tend to ride about 0.1/0.2 bar higher than the manual for front/rear as it greatly increases tyre life. The manual was designed for all around general conditions for an average person. High speed tar you can inflate higher higher, dirt lower, and body weights differ. I'm stocky and musucular and heavier than the averager person the manual is written for, so I ride with a bit more pressure.


On gravel, you can under inflate, but then you are vulnerable to pinch outs if an impact. So I dont underinflate much and rather choose to ride a bit slower.

I carry a compressor on long trips so i can adjust my tyre pressures according to conditions.


I don't disagree with any of that, the trouble is insurance companies look at the manual/tyre manufacturers recommendations and fuck you with a big stick if you do anything different on road...
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garth
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PostPosted: 13:29 - 18 Jun 2012    Post subject: Reply with quote

Sorry, what?

I don't think an insurance company would refuse a payout for 2psi over stock.

I only check mine when things start to feel a bit odd. Laughing
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