7heDude

Hello guys I am new to this forum so please forgive me if this isn't the right place to post this. I have recently got into racing and more specifically vintage Japanese racing bikes. I have an opportunity to buy a Koga Miyata from a friend pretty cheap. It is missing the rear derailleur and original handlebars. Any idea what the stock ones were, how to find them, and how much they cost to buy? Thank you so much for your help.

Italuminium

Welcome! Koga Miyata has been around for close to 40 years now, making a plethora of models. So yes, we can probably find out what the original equipment was, but we can't really do it based on your description. One good drive side picture tells more than a 1000 words. Also ,derailers are mostly not tied directly to one kind of bike, so you can swap in a great variety of rear derailers (within limits of course), costing anywhere between a few $ to several hundred

eschlwc

match the rear to the front derailleur (suntour or shimano) and find japanese bars from sr or sugino.

rgver

Mine is an 89 (I think) Excerciser, RD is a charcoal 105 matching the rest rest of the components, bars are SR Road Champion

minority

You can get all the old brochures here:

https://www.koga.com/en/service/brochure/past-brochures

If you know the model and year you can fine out exactlt what you need (especially if you can read Dutch )