1" ITA規格ヘッドチューブ内径想定値って、メーカーごとに細かいぶれがあるな

昔の1" ITA? 30.0mm
http://brown-snout.com/cycling/tech/barnetts/barnetts_ch04.pdf

cane creek 30.05 - 30.10
http://www.canecreek.com/wp-content/uploads/2018/02/canecreek-shis-poster.pdf

chris king 30.15mm (+0.00 -0.05)
https://cdn.shopify.com/s/files/1/2920/2114/files/traditional-headset-spec-chart-2016.pdf

neco 30.2 (+0 -0.1)
https://www.necoparts.com/en/page/E-catalog.html

tange 30.2 (+0.00 -0.05)
http://www.tangeseiki.com/jm/products/headset/standard/standard-threadless/standard-threadless-1/72-technoglide-classic.html

旧来の30.0mmのヘッドチューブだと、現行のヘッドパーツ圧入はやや無理が出る?