Scottsdale, AZ Trip. 28t cassette too small/50mm wheels too big?

Actually decided to do Lemmon tomorrow. I am still in between on the 5.6s or not. I am leaning towards the Enve’s just because of how predictable the descent is.

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I’ve done a nearly identical descent in the Sierras

profile looks like Mt Lemmon:

Mosquito Ridge is an 18 mile descent at -5%, its a logging road with really nice pavement and very few switchbacks. The day I did it the temps were 55F at 6000’ elevation and then a front moved in and it dropped into upper 30s while descending. Chilly!!