Welcome, Guest. Please Login or Register

Author Topic: "Bursting" the rear Michelin on a 600km young 1200GS LC - final chapter.  (Read 23195 times)

0 Members and 1 Guest are viewing this topic.

Offline 2wdrift

Re: "Bursting" the rear Michelin on a 600km young 1200GS LC ...
« Reply #160 on: April 14, 2015, 12:13:36 am »
If the bike was moving at 180km/h the tyre would be moving at the same speed at its normal radius. If that radius increased by a third (due to delamination) you could be looking at a piece of rubber being flung around at a fair bit over 200km/h. I would hazard a guess that even a 4-5mm stainless steel plate would be wrecked by that?

The bit of tyre that is in contact with the road moves at 0km / hour ( it is in contact with the road ).

The hub travels at the speed of the bike.

The bit of tyre at the top is traveling at twice the speed of the bike.

If there is a bit of rubber attached to the tyre by a length of cord it is going faster.

I am sure that a bit of rubber would go through a lot of steel under those conditions.

An under inflated tyre would fragment rapidly at that speed.

I have tried explaining that to a few friends but have not been overly successful. So basically if a tyre were to delaminate at 100km/h and it extended a third further away from the hub/fulcrum it would be hitting the mudguard at a good 130km/h?
XR650R the one and only
Calling upon my years of experience, I froze at the controls.  ~Stirling Moss

Don't worry my stutter is also bilingual...
 

Offline Geriatrix

Re: "Bursting" the rear Michelin on a 600km young 1200GS LC ...
« Reply #161 on: April 14, 2015, 04:36:34 am »
The tyre in contact with the road moves at 0km per hour.
The hub at 100km per hour.
The top of the tyre 200 km per hour
The extra bit is 1,3 times further from the hub so it will be moving at 260km per hour, provided that it hits nothing as it goes around, and can accelerate freely. I do not know how the actual path and speed can be measured.
Clinicians can contact the clinicians' hotline number on 0800 111 131 (for doctors only); and, in addition to 0800 029 999, the public can also contact the public hotline number on 0800 111 132. These lines all operate 24 hours a day.
 

Offline TheBear

  • Bachelor Dog
  • *****
  • Bike: BMW R1150GS Adventure
    Location: Western Cape
  • Posts: 11,442
  • Thanked: 928 times
  • Die Ruiter sal KilRoy regruk
Re: "Bursting" the rear Michelin on a 600km young 1200GS LC ...
« Reply #162 on: April 14, 2015, 08:14:50 am »
I am no scientist or mathematician.  I do know one thing.  If that ever happens to my bike I would appreciate lots and lots of stuff between my posterior, inclusive of other soft bits, and that piece of tire!     :eek7:
#BB33 #BRADICAL!
#DB40 #DIVEBOMB!
#SO4 #FULLGAS!
 

Offline Manic

  • Little Fat Guy
  • Vendors
  • Gentleman Dog
  • *
  • Bike: KTM 790 Adventure R
    Location: Eastern Cape
  • Posts: 17,999
  • Thanked: 344 times
Re: "Bursting" the rear Michelin on a 600km young 1200GS LC ...
« Reply #163 on: April 14, 2015, 08:42:07 am »
The tyre in contact with the road moves at 0km per hour.
The hub at 100km per hour.
The top of the tyre 200 km per hour
The extra bit is 1,3 times further from the hub so it will be moving at 260km per hour, provided that it hits nothing as it goes around, and can accelerate freely. I do not know how the actual path and speed can be measured.

So if the actual bike is moving at say 250kph, how fast will the tyre turn THEN?
 

Offline Jakkals

  • Grey hound
  • ****
  • Bike: Honda CRF-1000L Africa Twin
    Location: Western Cape
  • Posts: 6,402
  • Thanked: 31 times
  • I never get lost, I only discover new roads
Re: "Bursting" the rear Michelin on a 600km young 1200GS LC ...
« Reply #164 on: April 14, 2015, 08:50:13 am »

So if the actual bike is moving at say 250kph, how fast will the tyre turn THEN?
[/quote]

Baie viniger as wat jy kan dink. :biggrin:
Remember that hapiness is a way of travel - not a destination.
 

Offline Geriatrix

Re: "Bursting" the rear Michelin on a 600km young 1200GS LC ...
« Reply #165 on: April 14, 2015, 08:53:02 am »
The top of a normal tyre would be moving at 500km per hour compared to the road ( actually a little faster since the bottom of the tyre is usually slightly indented by the road, and the top is slightly pushed out by inertia and centripetal force, so the top is further from the hub than the bottom ).
Clinicians can contact the clinicians' hotline number on 0800 111 131 (for doctors only); and, in addition to 0800 029 999, the public can also contact the public hotline number on 0800 111 132. These lines all operate 24 hours a day.
 

Offline 2StrokeDan

  • a Man of Character
  • Worshond
  • ***
  • Bike: KTM 690 Adventure
    Location: Western Cape
  • Posts: 28,004
  • Thanked: 2736 times
  • Slim like Bill, straight like Steve
Re: "Bursting" the rear Michelin on a 600km young 1200GS LC ...
« Reply #166 on: April 14, 2015, 08:55:58 am »
Can a GS1200WC actually do 180??

This is the question.

 :peepwall:
 

Offline silvrav

Re: "Bursting" the rear Michelin on a 600km young 1200GS LC ...
« Reply #167 on: April 14, 2015, 08:56:32 am »
The tyre in contact with the road moves at 0km per hour.
The hub at 100km per hour.
The top of the tyre 200 km per hour
The extra bit is 1,3 times further from the hub so it will be moving at 260km per hour, provided that it hits nothing as it goes around, and can accelerate freely. I do not know how the actual path and speed can be measured.

my wife slaps at about 20km/h (rough estimate) so anything faster then that I really would want it to touch me  :imaposer:
 

Offline Geriatrix

Re: "Bursting" the rear Michelin on a 600km young 1200GS LC ...
« Reply #168 on: April 14, 2015, 08:58:46 am »
Can a GS1200WC actually do 180??

This is the question.

 :peepwall:


Yes, it has good brakes so with enough warning it can slow down to 180km / hour.
Clinicians can contact the clinicians' hotline number on 0800 111 131 (for doctors only); and, in addition to 0800 029 999, the public can also contact the public hotline number on 0800 111 132. These lines all operate 24 hours a day.
 

Offline 2StrokeDan

  • a Man of Character
  • Worshond
  • ***
  • Bike: KTM 690 Adventure
    Location: Western Cape
  • Posts: 28,004
  • Thanked: 2736 times
  • Slim like Bill, straight like Steve
Re: "Bursting" the rear Michelin on a 600km young 1200GS LC ...
« Reply #169 on: April 14, 2015, 08:59:42 am »
Can a GS1200WC actually do 180??

This is the question.

 :peepwall:


Yes, it has good brakes so with enough warning it can slow down to 180km / hour.

 :imaposer:
 

Offline THROTTLE JOCKEY

  • Race Dog
  • ***
  • Bike: KTM 950 SE
    Location: Eastern Cape
  • Posts: 3,545
  • Thanked: 91 times
  • Number plate T JOCKEY EC
Re: "Bursting" the rear Michelin on a 600km young 1200GS LC ...
« Reply #170 on: April 14, 2015, 09:02:14 am »
One for you cleva boys


does the bike hang or push down on its spokes assuming it is a spoked rim.

 :peepwall:
Ride it like you stole it!

OWN:KTM 950 SE***Suzuki DR650***Yamaha XT 600 Tenere***Yamaha XT 200***Honda CRF450X***Honda TRX 300 Quad***CRF1000AT
LIBERATED:KTM 640 Adventure***Suzuki 200 Djebel
SOLD:HONDA CRF450R***Honda CR250R***Yamaha YZ250***Yamaha WR200***BMW F800GS***YAMAHA XT660 extreme***Yamaha XT660
 

Offline ETS

  • Grey hound
  • ****
  • Bike: KTM 890 Adventure R
    Location: Northern Cape
  • Posts: 6,759
  • Thanked: 119 times
  • Die Punda van Prieska
Re: "Bursting" the rear Michelin on a 600km young 1200GS LC ...
« Reply #171 on: April 14, 2015, 09:03:15 am »
One for you cleva boys


does the bike hang or push down on its spokes assuming it is a spoked rim.

 :peepwall:

Hang. Duh
If i had to explain you would not understand anyway......
 

Offline Mr Zog

  • Well fuck me, I'm a
  • Grey hound
  • ****
  • Bike: Honda XL500S
    Location: USA
  • Posts: 8,536
  • Thanked: 640 times
  • Without the gutter my mind would be homeless...
Re: "Bursting" the rear Michelin on a 600km young 1200GS LC ...
« Reply #172 on: April 14, 2015, 09:03:21 am »
One for you cleva boys


does the bike hang or push down on its spokes assuming it is a spoked rim.

 :peepwall:

It hangs...
Young enough to know I can, old enough to know I shouldn't, stupid enough to do it anyway.
 

Offline Geriatrix

Re: "Bursting" the rear Michelin on a 600km young 1200GS LC ...
« Reply #173 on: April 14, 2015, 09:21:51 am »
One for you cleva boys


does the bike hang or push down on its spokes assuming it is a spoked rim.

 :peepwall:

Cut the top spokes and see what happens.
Cut the bottom spokes and then see what happens.

Tell us, and we shall all know.
Clinicians can contact the clinicians' hotline number on 0800 111 131 (for doctors only); and, in addition to 0800 029 999, the public can also contact the public hotline number on 0800 111 132. These lines all operate 24 hours a day.
 

Offline THROTTLE JOCKEY

  • Race Dog
  • ***
  • Bike: KTM 950 SE
    Location: Eastern Cape
  • Posts: 3,545
  • Thanked: 91 times
  • Number plate T JOCKEY EC
Re: "Bursting" the rear Michelin on a 600km young 1200GS LC ...
« Reply #174 on: April 14, 2015, 09:42:22 am »
You already have two correct answers
  ;)
Ride it like you stole it!

OWN:KTM 950 SE***Suzuki DR650***Yamaha XT 600 Tenere***Yamaha XT 200***Honda CRF450X***Honda TRX 300 Quad***CRF1000AT
LIBERATED:KTM 640 Adventure***Suzuki 200 Djebel
SOLD:HONDA CRF450R***Honda CR250R***Yamaha YZ250***Yamaha WR200***BMW F800GS***YAMAHA XT660 extreme***Yamaha XT660
 

Offline GRIM

Re: "Bursting" the rear Michelin on a 600km young 1200GS LC ...
« Reply #175 on: April 14, 2015, 10:46:17 am »
My Physics lecturer would have a fit with all these simplifications...
 :deal:
Alcohol is essentially nature’s Leatt Brace – with it, you might not be able to move worth sh*t, but you can take a slam or two and be no worse for the wear.
 

Offline Geriatrix

Re: "Bursting" the rear Michelin on a 600km young 1200GS LC ...
« Reply #176 on: April 14, 2015, 10:54:27 am »
My Physics lecturer would have a fit with all these simplifications...
 :deal:

I am sure that you are correct, but a decent explanation would take at least twenty pages, and offer little precision.
Clinicians can contact the clinicians' hotline number on 0800 111 131 (for doctors only); and, in addition to 0800 029 999, the public can also contact the public hotline number on 0800 111 132. These lines all operate 24 hours a day.
 

Offline 2wdrift

Re: "Bursting" the rear Michelin on a 600km young 1200GS LC ...
« Reply #177 on: April 14, 2015, 11:14:11 am »
The tyre in contact with the road moves at 0km per hour.
The hub at 100km per hour.
The top of the tyre 200 km per hour
The extra bit is 1,3 times further from the hub so it will be moving at 260km per hour, provided that it hits nothing as it goes around, and can accelerate freely. I do not know how the actual path and speed can be measured.

Yes I was referring to the impact of a loose piece of rubber. As the hub an bike are moving at the same speed the maximum speed at which the tyre could hit the mudguard would be around 130km/h.

Once you start thinking about exactly how this stuff works high speed becomes very much less inviting all of a sudden.
XR650R the one and only
Calling upon my years of experience, I froze at the controls.  ~Stirling Moss

Don't worry my stutter is also bilingual...
 

Offline Geriatrix

Re: "Bursting" the rear Michelin on a 600km young 1200GS LC ...
« Reply #178 on: April 14, 2015, 11:42:41 am »
Do you mean the relative speed between the bike and bit of loose rubber?
To calculate that would depend upon so many factors and change so quickly during the revolution that the physics is way out of my league. It would be enough to hurt if it hits you.
Clinicians can contact the clinicians' hotline number on 0800 111 131 (for doctors only); and, in addition to 0800 029 999, the public can also contact the public hotline number on 0800 111 132. These lines all operate 24 hours a day.
 

Offline TheBear

  • Bachelor Dog
  • *****
  • Bike: BMW R1150GS Adventure
    Location: Western Cape
  • Posts: 11,442
  • Thanked: 928 times
  • Die Ruiter sal KilRoy regruk
Re: "Bursting" the rear Michelin on a 600km young 1200GS LC ...
« Reply #179 on: April 14, 2015, 11:52:01 am »
My Physics lecturer would have a fit with all these simplifications...
 :deal:

That is why he is a physics lecturer and not a biker.   :ricky:

Now, the last time I passed physics was back in St. 7 and even then it was by a whisker.

Isn't rotational speed the thing here?  For the bike to move forward at 180km/h, the rear wheel must rotate at a certain speed and that speed is determined by the gear ratios.  Say the wheel turns at 6000 rpm and that piece comes loose, what force is in play?  That is apart from ä moerofa force".
« Last Edit: April 14, 2015, 11:55:11 am by AMZ »
#BB33 #BRADICAL!
#DB40 #DIVEBOMB!
#SO4 #FULLGAS!