Starters ...

I know i am lookin' for a 450 Mms "Axle to Axle " Lenght

Maybe less ...

I started from a Standard 110 Links Brand-New Chain ,

goin' Less , Step by Step .

I Know these Measurments are NOT Exact "at the Millimeter" , 

but i count on the rear Frame's Axle Adjusters to Complete the Job .

Anyway : now : i Got what i Wanted .

The Three LAST Measurements ( bottom of Fouckin'Pic ) Seems to be very CLOSE to the Truth to me ...