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@Pifko Open Pave's. Had three punctures with butyl tubes in 2k miles, all in the same week. I then binned the tyres and got a new pair. At the same time I installed latex tubes - have had two punctures in a week.
@Scilly.Suffolk I can hear a leak of air, but I can't find the source. I can pump the tubes back up and they hold air, but not enough to use them.
@miro_o They're actually losing pressure. They feel just like butyl tubes when I first set off. Two hours later, they feel like they've lost 30psi.
It's all good though - I'll keep using them for now. For what it's worth - I'm using these as I get 'em cheap. http://www.sigmasport.co.uk/item/Bontrager/Race-X-Lite-Inner-Tube-700-x-18-25-Presta-60mm/E5Q
What tyres @JB