I am currently using a vintage 1981 Koga Miyata Full Pro as my daily commuter .... (bought 3 weeks ago) a superb ride, light and quick and it was a bargain
I need to upgrade the groupset (I want brifters) and I will get good light strong tubeless ready rims/wheels, front wheel will have a Son 28 dynamo hub, back will most probably be DT Swiss or Chris King R45 if I can find a used one within my budget and I will get my LBS to build them
I'm still undecided on the groupset, but it will be Dura Ace .... I'm looking very closely at the Dura Ace 7800 groupset, but I wish to use a 12-32 Casette and I'm not sure if the 7800 rear derailler will be suited?
I wil also be buying some Apidura bags (Tube Pack and a Frame Pack), and I'm hoping to use this bike as my daily commuter aswell as for some Audax rides. I cannot fit wide tyres,and will have to settle on 25's. Mudguards may be another problem
What's the original group for this frame? Presumably 7sp and 126mm OLN at the back. Are you going to cold set it or just spring the back end every time to get the rear wheel in?
A clubmate has a Vitus 797 which he uses with a 11-34 mtb cassette and compact double chainset; he uses mtb mechs and finds it a very good solution.
Tyres do seem to be a problem on a few older frames. My Peugeot has mudguard fittings but won't take anything bigger than a 23 because of the problem forcing the tyre past the chainstay bridge when fitting the rear wheel (which is why I have converted to 650B for comfort). Even the 650B wheels need a bit of forcing, inspite of having cut 6mm off the rear fork-ends to make life easier (they do have 38 section tyres though)
I bought the frame and forks and transfered the groupset from my other Koga Miyata to this one (old 105 Golden Arrow groupset)
The original groupset on the new Miyata was the early 80's Dura Ace AX/EX 6 speed.
The OLN is 130mm and I am currently using my old Giant P-R2 wheels with a 9 speed cassette (11-28), but I will get some decent wheels and change that to a 10 speed cassette and fit the Dura Ace 7800 groupset...
by changing to 10 speed, this will allow me to occasionaly use my other wheels which I have on my Giant TCR (HED Belgium Plus with Chris King R45 hubs (ceramic bearing upgrade) ... and I will not have to change Cassettes every time I switch
On the HED wheels, I will be trying tubeless tyres for winter (2017 IRC Formula Pro RBCC in 25mm wide), and will be able to use these wheels on the Koga Miyata
still lots to do on the Koga Miyata but it fits me well, rides brilliant and I don't mind spending a fair bit of cash to get it sorted