Tell me more about your Big Apples: How wide are the 60-406s? I bought a pair of 50-406s from Calhoun recently, and they're about 47 mm on my Aeroheat rims.

And where can one buy the Primo Comet Red Label and KHE Premium Folder? I did a google search but got no hits.

I bought the pair of 50-406s Apple to try on a bike designed for 451 tires. The BAs were nearly the same diameter as 28-451 Stelvios, so the steering geometry of the bike and bottom bracket height wasn't changed much. I suppose the 60s would keep things just about exactly the same.

The big tires made the handling much smoother, and were as comfortable as a sprung seatpost and fork, but, as I mentioned in another thread, I thought they felt really heavy when I was climbing. I know they're touted as having low rolling resistance, but they "felt" slow to me. I guess I should have done a more scientific comparison, and measured actual speeds instead of "feel!"

You say you use them on your fastest and lightest bike, so obviously your Big Apples don't feel ponderous?

The 60-406s are listed as 600 gm apiece on the Calhoun site. This seems heavy! But, I'm willing to experiment some more. What are the benefits of a 1.3 pound tire? Should I try a set of 60s on my next brevet? Maybe...