From:Dan Dwyer
Subject:RE: RE: Ace Frame Number (Ref to Date:Mon Dec 28 19:59:19 2015
Response to:6000
Thanks for the info Doug - Really appreciated.

I did not know about the Adjusting Bolt Boss being square on the early frames (I am assuming '24 and earlier).
That helps a lot.

Thanks again, Sir!

I've never been able to correlate frame numbers to the year
of the Ace, rather going by the engine numbers. The later
Ace frames (generally 1926 & later) had a 1 inch long axle
adjusting bolt boss where the earlier frames had a small
square boss. Later main forks had a support boss at the top
of the tubes where they meet the handlebars, and the forks
were a bit larger to make room for the new balloon tires.
Ace also rebuilt engines for dealers and customers. They
generally did not get their original engine back as they
were swapped out with an engine already rebuilt.

A couple of threads below this, "Karen" offered a 1925 Ace
project for sale.

In post #5981 she stated:

"...The number stamped on the frame (under the seat) is

Just curious as to if anyone knows what this Frame #
represents (Year-wise).

Any other basic info regarding Ace frame numbers would be

As one point of reference, I checked the Ace on Display at
the Sturgis Motorcycle Museum. It is shown as a 1922, and
has a 2XXX frame number.

Hope everyone had a good Holiday!
Thanks guys.