Deleted
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Post by Deleted on May 9, 2017 12:04:01 GMT
Oh, I misunderstood. I thought he had already ridden it with the new reduced pressure approach.
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Post by Alanović on May 9, 2017 12:16:44 GMT
Ah no. That was me and my bike. I found the new lower pressure much more acceptable and it's now comfortable enough to not bother with new, wider tyres.
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WDB
Full Member
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Post by WDB on May 9, 2017 13:01:47 GMT
What I was thinking, and possibly not expressing with limpid clarity, was that the tube has a harder life than the valve, being subject to all sorts of shocks and stresses from the road (and sometimes the spokes 😈) that will find out any tiny manufacturing faults.
I've also known failures to occur where the valve is inserted into the tube - and lower pressure can encourage this as it increases the amount the tube can move against the rim, pulling at the circle around the valve.
Dunk the valve part of the wheel in a trough of water. That'll tell ya. No need to even take it off the bike.
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Post by bromptonaut on May 9, 2017 13:19:59 GMT
If you only pumped them up to 40 I doubt they're over inflated. If you cannot detect where they're leaking from then it's time to check them in a bowl of water.
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Post by Alanović on May 9, 2017 13:30:28 GMT
Blimey, it gets difficult doesn't it? They were inflated to 60, then I found them flat. I re-inflated them to 40, and found them flat again after 2 days.
Something's wrong with the inners. I don't much care what it is, as I need to take them off to either effect repair or replace - and replacements are only £2.50 for a pair, so I shall simply fit new.
I suppose if I feel curious at the time I'll do the bowl of water thing and post the results on here. But, please don't get distracted from Eurovision or the Championship play-off semi-finals this weekend in expectation of this thrilling update, as I most likely won't bother. I mentioned it in the first place as I was wondering out loud if valves giving up under pressure was a known thing or not.
You back from the USASSR now, Brompterooney?
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Deleted
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Post by Deleted on May 9, 2017 13:37:02 GMT
Eurovision is *still* going? Who knew.
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Post by Alanović on May 9, 2017 13:53:02 GMT
It's on Saturday. Having a Beer World Cup with an old University mate while we watch it with our families.
Endless entertainment, but once a year is sufficient.
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Post by bromptonaut on May 9, 2017 18:00:13 GMT
If you don't know how/where/why the originals failed then you risk ending up with both new ones being damaged too. While Presta* valves are prone to leaking due stem damage Schreader (ie car type) are pretty robust. They can though give up at the join of valve stem and tube, as suggested above.
Have you gone over the tyre treads with a fine tooth comb? Had repeated problems with a Brompton tyre that punctured over and over. A tiny piece of glass was just penetrating the raised centre of the tread when the tube was inflated but was concealed when the cover was 'relaxed' so not located by usual routine of running finger along the canvas inside.
Found it by examining outside of tread for embedded chips/thorns.
*Some of us also remember Woods valves.....
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Post by tyrednexited on May 9, 2017 19:36:26 GMT
*Some of us also remember Woods valves..... ....SWMBOs and my e-bike both have Woods valves...... Vorsprung durch Technik and all that! |
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Post by Alanović on May 11, 2017 8:43:27 GMT
Thorns discovered in both tyres. They had broken off on the outside but were stuck on the inside like Brompter's piece of glass. Quite a coincidence that both went the same way at the same time.
Offending objects removed with the wife's eyebrow tweezers (don't tell her), and new inners fitted. Also purchased some spare inners for stock, rude not to at £2.50 for a pair in Decathlon.
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Post by bromptonaut on May 12, 2017 7:02:37 GMT
Thorns discovered in both tyres. They had broken off on the outside but were stuck on the inside like Brompter's piece of glass. Quite a coincidence that both went the same way at the same time. {bitter experience} Not that much of a coincidence if both wheels were in same place/time just after hedges have been cut. {/bitter experience} |
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