Punctures ... That Arent
Posted: Fri Jan 04, 2013 1:27 pm
Last time I raised this topic I kinda ended up getting swamped...
Perhaps this time it will be easier as I now know a lot more than I did last time.
Last year I started to get a raft of flats which I assumed where punctures. I changed my tyres and most of these 'punctures' stopped for a while.
Moving on, and remember I am still giving this cycling lark a bit of a go, so I am very noob so sorry if this is basic.
I got another 'puncture' this time I found a stone had goine into and worked its way into the tyre...Yeah a cause at last. Anyway, I had the bike booked in for a service so I had the shop change the tube and so on after I dug the stone out.
The shop filled the new tube and off I rode. That was about 3 weeks ago I suppose.
As the tube maintained good pressure I had no reason to touch it...until yesterday.
On my ride to work the tube suddenly lost pressure. Thinking I had a puncture as I had been riding through some glass I thought okay so pulled over to pump the tube up a bit to get to work. On undoing the presta valve the undoey threaded brass knurl fell off into my hand as the wire shaft had broken.
I have had this happen many times in the past and always blamed myself for leveraging with the hand pump or being a bit rough with my floor pump. However here is an instance where I have not touched the valve, all I have done is ride the bike and the valve has 'broken' for no apparent cause.
This is a mechanical item so there is no such thing as no apparent cause. There is simply cause I have not diagnosed as I am not sure where to start. So has anyone else had this type of failure repeatedly and if so how did you solve it?
Perhaps this time it will be easier as I now know a lot more than I did last time.
Last year I started to get a raft of flats which I assumed where punctures. I changed my tyres and most of these 'punctures' stopped for a while.
Moving on, and remember I am still giving this cycling lark a bit of a go, so I am very noob so sorry if this is basic.
I got another 'puncture' this time I found a stone had goine into and worked its way into the tyre...Yeah a cause at last. Anyway, I had the bike booked in for a service so I had the shop change the tube and so on after I dug the stone out.
The shop filled the new tube and off I rode. That was about 3 weeks ago I suppose.
As the tube maintained good pressure I had no reason to touch it...until yesterday.
On my ride to work the tube suddenly lost pressure. Thinking I had a puncture as I had been riding through some glass I thought okay so pulled over to pump the tube up a bit to get to work. On undoing the presta valve the undoey threaded brass knurl fell off into my hand as the wire shaft had broken.
I have had this happen many times in the past and always blamed myself for leveraging with the hand pump or being a bit rough with my floor pump. However here is an instance where I have not touched the valve, all I have done is ride the bike and the valve has 'broken' for no apparent cause.
This is a mechanical item so there is no such thing as no apparent cause. There is simply cause I have not diagnosed as I am not sure where to start. So has anyone else had this type of failure repeatedly and if so how did you solve it?
That's as good as I can think of. 
It was in fact. Well at least now I know.