Welcome, Guest. Please Login or Register

Author Topic: UNEXPLAINED FLAT REAR TIRE  (Read 827 times)

0 Members and 1 Guest are viewing this topic.

Online Vis Arend

  • It's not how fast you start, it's how long you endure.
  • Grey hound
  • ****
  • Bike: Honda CRF-250 Rally
    Location: Eastern Cape
  • Posts: 8,849
  • Thanked: 397 times
UNEXPLAINED FLAT REAR TIRE
« on: September 26, 2013, 11:54:10 am »
It happened this weekend on a short day trip.

We were cruising along at a steady 80 odd km\h on a fairly good gravel road and all of a sudden the rear tire went flat, running on the rim for a good 50 plus meters before I got the scoot to a stop.  Luckily is was on a straight.  It was a sudden\instant flat, no pre warning whatsoever. 

I inflated the wheel and managed to pop the bead onto the rim and inflated the tire 2 bars, I couldn't find any puncture or leak.  We continued with our trip and arrived safely home without any further incidents.

Some info on the back tire.
Heidi's which is almost on its last legs, the tire pressure were 2 bars when I last checked.  (That was in the morning)
We were slightly loaded, two up.

What could cause the tire to go flat so quickly?
Is it common or is this an isolated incident?
What can be done to prevent it from happening again?

If this happens at speed and particular while cornering I see big k@k.   :eek7:

Advice please.   :thumleft:
 
No matter how slow you go, you're still lapping everybody on the the couch
Honda XL125  -  Sold,    Honda XR200R  -  Sold,     Yamaha TT500  -  Sold,     Honda Transalp700  -  Sold,       Yamaha S10 Fast Blue  -  Sold,   Yamaha S10 Slow White  -  Sold,   Honda CRF250 Rally - To be Sold, XR650L - Sold,   Honda CRF250Rally back in the stable,   BMW K1200LT.
 

Offline HB 9

Re: UNEXPLAINED FLAT REAR TIRE
« Reply #1 on: September 26, 2013, 11:59:45 am »
I have been wondering about that while reading your RR.

 ???  :sip:
Tread lightly
 

Offline spankme

Re: UNEXPLAINED FLAT REAR TIRE
« Reply #2 on: September 26, 2013, 12:01:31 pm »
Valve leak
 

Offline spankme

Re: UNEXPLAINED FLAT REAR TIRE
« Reply #3 on: September 26, 2013, 12:04:12 pm »
After you check pressure wipe a bit of spit on the valve to see if a bubble forms
 

Offline HB 9

Re: UNEXPLAINED FLAT REAR TIRE
« Reply #4 on: September 26, 2013, 12:10:12 pm »
Will a valve leak cause an instant flat?
Tread lightly
 

Offline Bie

  • Local Mods
  • Race Dog
  • ***
  • Bike: NER-A-CAR
    Location: Eastern Cape
  • Posts: 3,459
  • Thanked: 1204 times
  • Winners never quit, Quitters never win.
Re: UNEXPLAINED FLAT REAR TIRE
« Reply #5 on: September 26, 2013, 12:16:37 pm »
What about a leak on the bead that corrected itself after it came off the rim and was reset?
Kom ons maak 'n stoffie.
 

Offline Teapot

  • "Ride long Live forever"
  • Race Dog
  • ***
  • Bike: BMW F650GS / Dakar
    Location: Gauteng
  • Posts: 2,089
  • Thanked: 1 times
  • "RIDE LONG AND LIVE FOREVER"
    • http://www.digitalrealitydesigns.yolasite.com
Re: UNEXPLAINED FLAT REAR TIRE
« Reply #6 on: September 26, 2013, 12:27:40 pm »
That is very strange. I use Heidies. Hope that never happens to me. Try contact the manufacturers and ask.
"FALL DOWN 7, STAND UP 8."
"NEVER GIVE UP, NEVER SAY DIE!"
 

Offline Heimer

  • Global Moderator
  • Bachelor Dog
  • ***
  • Bike: BMW R1200GS
    Location: Western Cape
  • Posts: 13,154
  • Thanked: 199 times
  • Kan nie ALZ onthou nie
    • Social Travel Digital solutions
Re: UNEXPLAINED FLAT REAR TIRE
« Reply #7 on: September 26, 2013, 12:31:22 pm »
Did you have the tyre inflated with a CO2 cannister?

I have had unexplained flats with these. The CO2 leaks out. Likely not the same size molecules as air.

Once you fix a flat with these, you need to deflate as soon as practical an re-inflate with air.
« Last Edit: September 26, 2013, 12:32:05 pm by Heimer »

Matriek getuigskrif 1979: ........... is 'n vriendelike seun met volop selfvertroue. Hy tree soms vreemd op. Die skool se beste wense vergesel hom.
 

Offline SmuGS

  • A very quiet
  • Race Dog
  • ***
  • Bike: BMW R1150GS
    Location: Eastern Cape
  • Posts: 3,336
  • Thanked: 69 times
  • 100 048 km.
Re: UNEXPLAINED FLAT REAR TIRE
« Reply #8 on: September 26, 2013, 12:33:45 pm »
Sand between rim and tyre..?
Nee wat vlekkelose ek kuier op my lekkerste tussen die rokers,dronkgatte,vloekers,hoere en ander sondaars  :imaposer:
R1150gs,  KLE 500, XT660R.
 

Offline HB 9

Re: UNEXPLAINED FLAT REAR TIRE
« Reply #9 on: September 26, 2013, 12:36:39 pm »
Did you have the tyre inflated with a CO2 cannister?

I have had unexplained flats with these. The CO2 leaks out. Likely not the same size molecules as air.

Once you fix a flat with these, you need to deflate as soon as practical an re-inflate with air.

I will remember this...thank you  :thumleft:
Tread lightly
 

Offline spankme

Re: UNEXPLAINED FLAT REAR TIRE
« Reply #10 on: September 26, 2013, 12:47:18 pm »
Slow valve leak will get to a point where tyre breaks from rim,quicker on tubeless
 

Offline Heimer

  • Global Moderator
  • Bachelor Dog
  • ***
  • Bike: BMW R1200GS
    Location: Western Cape
  • Posts: 13,154
  • Thanked: 199 times
  • Kan nie ALZ onthou nie
    • Social Travel Digital solutions
Re: UNEXPLAINED FLAT REAR TIRE
« Reply #11 on: September 26, 2013, 12:52:16 pm »
Did you have the tyre inflated with a CO2 cannister?

I have had unexplained flats with these. The CO2 leaks out. Likely not the same size molecules as air.

Once you fix a flat with these, you need to deflate as soon as practical an re-inflate with air.

I will remember this...thank you  :thumleft:

I have twice changed tyres in my garage and used the CO2 to pop the tyre onto the bead and then using air from my compressor to inflate al the way.

On both front and rear tyres I have had flats - until I replaced all with air. Problem gone away.  :thumleft:

Matriek getuigskrif 1979: ........... is 'n vriendelike seun met volop selfvertroue. Hy tree soms vreemd op. Die skool se beste wense vergesel hom.
 

Offline spankme

Re: UNEXPLAINED FLAT REAR TIRE
« Reply #12 on: September 26, 2013, 12:53:03 pm »
Did you have the tyre inflated with a CO2 cannister?

I have had unexplained flats with these. The CO2 leaks out. Likely not the same size molecules as air.

Once you fix a flat with these, you need to deflate as soon as practical an re-inflate with air.

Thats why soft drinks have a shelf life,the Co2 passes through the plastic
 

Offline LeonDude

  • A very quiet
  • Grey hound
  • ****
  • Bike: Suzuki DR650
    Location: Gauteng
  • Posts: 9,753
  • Thanked: 175 times
  • DR650 - The next adventure
    • Leon de Kock - Author pages
Re: UNEXPLAINED FLAT REAR TIRE
« Reply #13 on: September 26, 2013, 01:00:44 pm »
Subscribe, want to hear what VisArend says
Great news, my book 'Sniffer' has seen the light of day on Amazon Kindle!
https://www.amazon.com/dp/B01N664WIH
Check out my website for free short stories!
http://www.leondekock.com/short_stories.html
 

Offline Mev Vis Arend

Re: UNEXPLAINED FLAT REAR TIRE
« Reply #14 on: September 26, 2013, 01:22:11 pm »
Hy het gesÍ "hou, hou, hou" en ek het geklou, klou, klou - en reg gemaak vir die val.  (Hou die arms en kamera styf teen die lyf en maak seker die bene bly in.)

Gelukkig skrik ek stadig. 
Honda XR250 - Given to daughter.  BMW 1200 GSA met Karretjie  -  Suzuki 125 Scoota with a KTM topbox - sold.  Honda CRF 250 L
 

Offline HB 9

Re: UNEXPLAINED FLAT REAR TIRE
« Reply #15 on: September 26, 2013, 02:16:40 pm »
Hy het gesÍ "hou, hou, hou" en ek het geklou, klou, klou - en reg gemaak vir die val.  (Hou die arms en kamera styf teen die lyf en maak seker die bene bly in.)

Gelukkig skrik ek stadig.
 

 :imaposer:  :imaposer:  :imaposer:
Tread lightly
 

Online Vis Arend

  • It's not how fast you start, it's how long you endure.
  • Grey hound
  • ****
  • Bike: Honda CRF-250 Rally
    Location: Eastern Cape
  • Posts: 8,849
  • Thanked: 397 times
Re: UNEXPLAINED FLAT REAR TIRE
« Reply #16 on: September 26, 2013, 02:29:00 pm »
No vavle leak, checked that one in the morning.
No CO2 cannister inflation, no sir.   :biggrin:

Could be as Bie and Smuggy says, a leak occured on the bead (sand) and corrected itself after it came of the rim, thats the only reasonable explenation at this point.  I have to say, when I checked the tire pressure in the morning, it was still the same as the previous weekend when we went for a ride, so it was not leaking up to that point.  


No matter how slow you go, you're still lapping everybody on the the couch
Honda XL125  -  Sold,    Honda XR200R  -  Sold,     Yamaha TT500  -  Sold,     Honda Transalp700  -  Sold,       Yamaha S10 Fast Blue  -  Sold,   Yamaha S10 Slow White  -  Sold,   Honda CRF250 Rally - To be Sold, XR650L - Sold,   Honda CRF250Rally back in the stable,   BMW K1200LT.
 

Offline spoedvark

  • Grey hound
  • ****
  • Bike: BMW R1200GS Adventure
    Location: Eastern Cape
  • Posts: 6,198
  • Thanked: 19 times
Re: UNEXPLAINED FLAT REAR TIRE
« Reply #17 on: September 26, 2013, 03:40:41 pm »
Ek wonder???

Could it be: YAirMAirHAir issues???

 :imaposer:  :imaposer:
Go Big!
or
Go Home!!!!
Previous bikes:
Yamaha XS 400 Special Kawasaki ZX 10 Yamaha XT 550 BMW 650 GS BMW 1200 GS KEEP THE RUBBER DUSTY!!!!
 

Offline Snoopy

  • Pack Dog
  • **
  • Bike: AJS (all models)
    Location: Eastern Cape
  • Posts: 93
Re: UNEXPLAINED FLAT REAR TIRE
« Reply #18 on: September 26, 2013, 04:20:39 pm »
Those Heidies are so hard ,it probably got a slow leak and you didn't feel it till the pressure got so low it just de-beaded all of a sudden .. I got a flat in town once and just felt a slight wobble ,got home and it was de-beaded already  :o
Got a flat on the front on the dirt and only realized when I slowed down ,the steering got a bit hard , they are hard tires and that ,I think ,will save the day rather than being a disadvantage  :thumleft:
Focus on the journey, not the destination.
Of all the things I have lost in life ,what I miss the most, is my mind.
 

Offline lecap

Re: UNEXPLAINED FLAT REAR TIRE
« Reply #19 on: September 27, 2013, 07:06:20 am »
No vavle leak, checked that one in the morning.
No CO2 cannister inflation, no sir.   :biggrin:

Could be as Bie and Smuggy says, a leak occured on the bead (sand) and corrected itself after it came of the rim, thats the only reasonable explenation at this point.  I have to say, when I checked the tire pressure in the morning, it was still the same as the previous weekend when we went for a ride, so it was not leaking up to that point. 



No
The valve did not seal after you checked pressure. Have seen this before, yesterday actually. I picked it up because I did the spit test. Replace the valve. It might happen again.
The tire then deflated slowly and got to a point where the vehicle weight or a bump pushed the bead into the rim well.

You should actually replace both the valve as well as the flexible rubber plug which carries the valve with every new  tubeless tire fitted. I know I always get puzzled looks when I ask at the fitment centre. If you have rigid valve plugs in your rim only replace the valve.
"If you think it's expensive to hire a professional to do the job, wait until you hire an amateur." (Red Adair)