Bo says on 3/Jan/12
In his official Japanese web site Kane is listed as 6 ft Rob.
Just click on his English profile and you will see by yourself.
Where's these two different height comes from:

- Kane has been raised in the US and gave them his height in imperial system: 6 ft.

- 6ft doesn't mean a thing to most Japaneses folk because they switched from their own system to metric system a while ago.

- Not knowing about imperial system they probably tried to convert it using their own ancient knowledge: 1 ken comes to approximately 1.8m. One shaku is one sixth of 1 ken or about 30.3cm
By assuming one shaku is about one foot, they did get 181.8 cm and round it down to 181 cm.

- Then everyone discovering Kane's height on his official website converted successfully those 181 cm to 5ft11 1/4 in Imperial system.

That how his height of 6 ft/183.5 cm became an official height of 181 cm/ 5ft11.25 all over the web.

Bo says on 2/Jan/12
Kane is listed as 5ft10 also on some Japanese websites...
Even the Official website is doing a wrong conversion cause on the very same link you gave Rob, his "English Profile" list him at 6Ft. Check-it out.
And as I told you I saw him measured in real life at a bit over 183 cm.
The Funny thing is the "5ft11.25" probably comes from other sites doing a right conversion of these 181 cm.
Originally a simple conversion mistake probably generate this wrong "official height" everywhere.
Since your website seeks accuracy, He should be listed at 6ft.

JD89 says on 8/Oct/11
in japanese sites Kane is listed 181cm/75kg his brother Shane 173cm/72kg and their father Sho Kosugi 183cm/90kg.

dmeyer says on 24/Feb/11
sho kosugi is supose to be 6 ft 1 while he is raughly as tall as vandamme 5 ft 9 they have the same 1 in shoes on if anithing vandamme is taller by a bit he rounding up 4 in