A question has come up on Fordbarn about dished front wheels. The guy asking has a 1915 that is looking to get his front wheels redone. He says they are dished. Looking at my 1918/19 and 1920 USA Ford owner Manuals, in both Answer No. 91 talks about the front wheels being dished and the reasons why. Did the 30X3 front wheels continue to be dished even at that late date (or later) or was this just a carry over from very early manuals? Between Bruce's book and a google search of this topic I could not find a concrete answer.
Dishing must have been minimal at most, as can be seen in this 1910 wheel drawing:
The demountable wheels were not dished as far as I know. Here's what Bruce wrote in the encyclopedia: " Non-demountable front wheels which used 30 by 3” tires were apparently dished throughout production. Wheels which used 30 by 3-1/2” tires (demountables and 1926 non-demountables) appear to have not been dished."
The 1921 manual here at MTFCA still has the mention of the dishing - and non demountables were still offered as standard equipment. The 1926 manual doesn't have it - and by then maybe the few non demountables still sold were updated. The spindles were also changed for less camber angle in the last years, maybe having more to do with the balloon tires being available in 1925?
There were other statements that were wrong after updates to the T that carried over to later editions of the manual, like the remark about the fluid level in the differential housing being one and one half inch under the oil hole in the 1921 manual.. That would be OK in a 1909-18 T with the oil hole at the middle, but when the hole was moved down to the proper 1/3 full level , the remark wasn't changed - the 1926 manual is also wrong.