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TheArchitect-
By slow I mean with a lot of time on the brakes. I thought you rode up Hardknott? If so you'll be familiar with extremes of Cumbrian the roads?
Coming down similar, narrow and twisting 20% roads that are open to traffic/sheep doesn't really let you do anything else unless you're on a mtb. Especially if your braking on carbon.
When @smallfurry is decending nordic moutains his speeds will be pretty high and that cool, high mountain airflow will help reduce heat buildup. On twisty small roads closer to sea level it's altogether different.
Descending Hardknott has popped Chinese carbon clinchers in the past.
miro_o
Just seen this thread. Carbon clinchers for riding in the lake district is an amazingly bad idea. At least the SwissStops aren't Yellows.
Slow descending of steep stuff hard on the brakes is exactly what leads to carbon rims heating up (and carbon clinchers rim-beads separating from the rims).
I'm amazed nobody on here mentioned this.