Originally Posted by
Psychkle
What do I need read in order to understand ? The dimensions I have, I can't find conversions for ?
Hoped someone here, who has a lot of experience might just easily say what I need.
It's a threaded headset, I am looking for a quill with 'a removable face plate' as stated by 'CACycling'
but from the sizes I have, what stem do I need to look for ? What size probably is the quill stem already installed, which is ( 7cm/2.8" ) and what size are the handlebars, which in the centre are ( 8.3cm/3.25" )
The relationship between circumference and diameter is C=Pi*D where Pi=3.1415 - so your 8.3cm is about a 26.4mm diameter and the 7m is about 22.2mm. It is tough to accurately get diameter by measuring circumference but the 26.4 is an intriguing number as certain Italian bars from that era were 26.4 which is not a common size seen today. And the 22.2 is indicative of the diameter of the end of a quill stem that fits in a 1" fork.