23" Front wheel

Found a company based in Japan these look like 23" wheels.
Looking and attempting to read the site using my Google translator they say Firestone 23"
  

http://www.reverb-inc.jp/products/detail.php?product_id=365

OIF Triumph

I was discussing the issue I had with the triumph frames being very low with a friend. He suggested looking at oil in frame triumph frames as they sit a bit taller.  Here is an option the xs650 frame is still taller however its closer.
Food for thought... 

CAD planning

Using some of the bikes that have inspired me I overlayed the stock xs650 frame drawing in AutoCAD.

I scaled the pictures by guessing their wheel sizes.

I really like lines of hard tailed triumphs however it now appears that the xs frame is much taller and will be difficult to replicate.

I am concerned about the rear 18 being out of proportion if I run a 21 front.

I think it looks good however the 23" front wheel looks more balanced.

My issue with the 23" front is that I cant run a traditional Avon speedmaster.

Below is a 23" tire on the Harley chrome wheel.

I think the Bratsyle xs650 above is also running a 23 which I don't mind.

  I like xs650 with very little stretch in the rear.  

The girder forks make the bike a little longer.

This is the frame a drew up tracing a .jpg of technical drawings from xs650.com.

It looks right and will do for now but will need to be checked to make sure its perfect.