The valve stems can perish over time so it would be advisable to change the lot when getting new tyres.
You would feel a bit silly when for the sake of a couple of quid you get a tyre going flat because the stem has perished.
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Just checked an old tyre invoice from a year ago. I was charged £1.23 per valve. I'd sooner pay that and have peace of mind.
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There are a couple of very good reasons for changing a valve at tyre replacement time.
Rust builds up on the rim under the valve seating. This can be removed during valve replacement.
The bonding between the brass core and the rubber sheath fails in time. This can lead to a rapid deflation at the most awkward time.
The core rarely fails unless dirt has been introduced during a pressure check etc.
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If the valve core fails, this will probably cause a relatively gradual loss of air, but the rubber stem, if perished, could break of under centrifugal force at high speed and cause a rapid deflation - not worth the risk for the small cost of a new valve...
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