Flat Rear, No Hole???

The CB1000R was last used 3 days. After checking the tyre pressure last ride (it was ok) ive just noticed the rear is dead flat but i cant find a hole?? Ive inflated it back to 40psi, went over it with a soapy sponge looking for escaping air but cant find a hole or puncture, the valve seems to be ok too. Ill wait and see if the gauge shows less pressure in a short while. Im confused.

Anyone else had a similar experience of a flat but no visible cause? Im hoping, as i cant find a puncture, there isnt one. Tyre's only done about 2k so still newish.

 

Could be a bit of dirt/grit got under the valve

 

A sticky valve/grit/dirt is what im hoping, makes sense as i used a gauge to check the tyres on Sunday. It seems to be holding pressure at the moment but its only been 5 mins.

 

Dont remember any potholes, although i do now think that whatever it was happened on Sunday, as iv'e noticed the edges of the tyre are both chaffed like you get on track day tyre's, i think this chaffing can also occur if running flatish. If thats the case fek knows why i didnt notice it while riding on Sunday, we wern't hanging about.. ???

 

gap between the rim and the tyre?

 

No, it's those new-fangled runflat tyres... Tom's used 'em for years I believe. Some people put air in; some don't. If there's no air, the circumference is smaller and the acceleration is better. Until, that is, speed grows to such an extent that the tread surface is stretched further away from the rim by circumferential force and the effective circumference of the wheel/tyre combo is greater. In this case, you get better miles per gallon at higher speed because the tyre travels further per rotation. Another benefit is that those same forces augment the suspension, so the ride becomes more comfortable. This is the reason Tom goes everywhere at full throttle. The tyres can be expensive, though, because they don't last long

 

Well it seems ok at the moment , its held 40.psi for over an hour with only a drop of .5 which i put down to me checking it every 20 mins... So still none the wiser what could have happened . Ill go with the sticky/dirty valve and pray the tyre is fine. How peculiar.

 

What Panelman said, I think!

 

It's your missus, trying to turn you mad(der).

 

Could always grab yourself a valve key (couple of quid) and pop out the valve to check, then reseat it. Had a few slow punctures before because the valve needed reseating.

 

Or turn a metal valve cap upside down and use that

 

Know what you mean Kev, but you don't often see these nowadays, mores the pity.

 

I've got a couple in the toolbox... Michelin tubes used to come with them IIRC. And I went thru plenty of those whilst I was despatching!

 

Too bloody useful to be standard fitting nowadays!!!

 

Everytime I read that thread title, I keep thinking this is going to be about some weird porn clip :-S

Ill get my coat

 

Oooh .some people

 

Been a while has it?

 

Alls well this morning, still 40 psi . Obviously the valve malfunctioned when i checked the pressure.

Lesson learnt - Dont check tyre pressure before going on a ride out.

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