Looks like a Fabric LumaRay to me, I’ve got one of them.
But I can’t find them to buy anymore!
These look similar:
They’re expensive for a “be seen” light, but nice and stealth.
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I’d say that’s more likely atmospheric conditions than the tyres. Such a small variation is inside confidence limits. And I don’t trust Strava PRs at all. They’re based on the Garmin record function, so can be up to (what is it?) 7 seconds off, if you’ve that’s setting turned on (it is default) - “Smart Recording”
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Dunno. But I guess that av speed and power were almost exactly the same, it ‘proves’ something…that I accidentally found a ‘balance point’ between tyre choices on this particular route.
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