Not strictly true. He builds with 1 1/8" too, if you request it or if your size requires it. Dave believes that 1" is enough for all but the biggest/most powerful of bike riders.
I haven't noticed any detrimental factors as of yet with the 1" headtube. I definitely think it looks better with respect to tube proportions.
I'm sure that not a lot of person can feel the difference from 1" to 1 1/8 and almost no one have Kirk as a race bike. My thought is that if you want a custom bike of that level you "need" a custom 1" stem and not just a shim
There are several 1" ahead stems available, admittedly not as many as 1 1/8", so "need" of a custom stem is not necessary, but if you're dropping 4k on a custom built frame absolutely nowt wrong with getting a nice custom made stem to top it off.
Not strictly true. He builds with 1 1/8" too, if you request it or if your size requires it. Dave believes that 1" is enough for all but the biggest/most powerful of bike riders.
I haven't noticed any detrimental factors as of yet with the 1" headtube. I definitely think it looks better with respect to tube proportions.