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I went with Vittoria open corsa cx 23s and conti supersonic tubes on shamal ultras for a recent alpine trip. Held up well in a thunderstorm with forked lightning on alpe d'huez and Col du Granon descents in torrential downpours.
Wanted to avoid the air bleed you get with latex tubes whilst shedding a bit of weight and have found that supersonics hold pressure well. Vittorias have been great coming from gp4000s- ill wait and see if they can match longevity of contis.
Make sure any back up tube is a standard thickness one as i would not want to be on the side of the road trying to delicately fit a thin tube with cold hands.
JS-187
@dancing james
A friend is off to Ventoux and wants a tyre upgrade, 25 mm clincher tyres for alpine riding?
Am suggesting latex inner tubes, his wheels are not carbon. Any preferred manufacturers?