Half-way home on a short journey last week I noticed that the VFR had suddenly developed a we're-going-straight-on tendency. Pulling over to check revealed a completely flat back tyre. I swore muchly, as the damn thing is only just over a fortnight old and probably only has about 200 miles on it. Anyway, I limped the bike to the next garage and put some air in, took it home and checked to see if I could find the culprit. A very thorough inspection of said round black thing failed to turn up anything at all and, since Thursday, it doesn't appear to be losing pressure at all. I was only doing a 10 minute journey when I got the flat and I had to start it off with a U-turn, so I'd have noticed if the tyre was flat then, so it must have deflated pretty fucking quickly So - my question - what makes a tyre go flat really fast, doesn't leave any signs and then disappears again? Answers on a postcard, please. -- AndrewR, D.Bot (Celeritas) Aprilia RSV-1000R, Honda VFR750F-L, Fiat Coupe 20v Turbo BOTAFOT#2,ITJWTFO#6,UKRMRM#1/13a,MCT#1,DFV#2,SKoGA#0 (and KotL) BotToS#5,SBS#25,IbW#34, DS#5, COSOC# Suspended, KotTFSTR# The speccy Geordie twat.
I don't have any postcards... will in here do, or do you want me to scribble it down on the back of a sealed envelope? -- JackH 98 Honda VFR800FiW 05 Sachs Madass 03 VW Passat TDI Sport 89 Vauxhall Nova 1.3 Pearl
Pound to a round thing it's a dodgy valve seat or insert. Might be nothing. I'd replace the valve insert anyway and the fitter should have put on a new stem. He did, didn't he?
This happened to me on my VFR. I'd pumped the rear tyre up at home and left one of those 90 degree valve adapter thingies in place. About 5 miles from home I noticed wobbly handling. Pulled over to a petrol station to find the adapter happily flopping about and only 10psi remaining in the tyre. No further issues once the adapter was stashed away in my pocket.
Just to make sure I get new valves I always cut the old ones off myself before taking the loose wheel in to the tyre fitters. I also remove the balance weights myself.
'Lozzo' wrote...> Good tip that, would also stop those dozy cunts who use huge knives to get the old weights off and scratch hell out of the wheels too.
Grit in the valve? But what would cause it to become apparent? Side mounted valve moved a bit, but then it probably wouldn't go down that quick. Are you *sure* it was ok when you left? Because my best theory is a bad case of scrotes.
That would be my best theory as well, except the first thing I did at the start of my journey was a feet-up U-turn ... even I'm not enough of a dozy **** to fail to spot a flat tyre there. -- AndrewR, D.Bot (Celeritas) Aprilia RSV-1000R, Honda VFR750F-L, Fiat Coupe 20v Turbo BOTAFOT#2,ITJWTFO#6,UKRMRM#1/13a,MCT#1,DFV#2,SKoGA#0 (and KotL) BotToS#5,SBS#25,IbW#34, DS#5, COSOC# Suspended, KotTFSTR# The speccy Geordie twat.
