Fitting modern group on vinatge/old frames

How 'bout injecting some money into the economy and getting a new frame. New frame with the new bits..?

This is the only valid reason I have read to NOT put it on the masi. If its just the case a modern group deserves a modern frame, I can accept that. That will happen eventually as I scan the forums and clearance frames on retail sites. But In the meantime ill put it on the masi and try to understand the pros and cons of a modern group on a older frame. I'm particularly interested in how the bottom bracket will behave..

So the single speeders must be totally bonkers!

Completely disingenuous comment. Single speed bikes obviously have their place but I'm clearly talking about the convenience of having a larger range and closer of ratios of gears on my geared road bike.

Bottom line: someone has an old frame they want to put some stuff on to ride it. You'd prefer that person to either obey some romantic notions of period-correctness, or ditch the frame altogether and buy a whole new bike. Odd.

What it boils down to is, so long as parts are made to standard sizing, most frames will fit with whatever parts are made. The exception to this is the bb30 shell. So this answers my original question. I have no romantic notion to adhere to rules or period correctness other than it being semantic. It's "nice" to see a steel Italian frame with period campy parts. If the rule was that all frames must be period paired then we will have a crapola lot of uneven bikes, particularly on this very forum,

A steel frame can last for a long time and will take the scrapes and dings. What's wrong with updating the parts over the years with modern bits if it fits.

D we really know what the lifespan of a carbon frame is yet? Does it even have to have one?

Point is we can find many reasons for not doing things but in the end, if it's works then go ahead and try.

P.s in the end I will find a suitable frame for red bits and stick my campy bits back onto the masi. And I bet no one will die

What it boils down to is, so long as parts are made to standard sizing, most frames will fit with whatever parts are made. The exception to this is the bb30 shell.

Actually NO. The Campagnolo drop outs on some older frames-- into the 1990s!-- had a bit of a different geometry for its hanger than what is optimal for "modern" indexed rear deraileurs. One can typically nearly always make something work--- one of the great glories of bicycles, hammers and screws---- but they the results can sometimes be less precise. Many older frames also have brazed on cable guides that are also sub-optimal for precise indexing. Luckily SRAM/Gore-Tex and Nokon cables help get around this but a little bit of creativity is still called for. The flexibility of older small diameter lightweight steel frames also makes some of the dual-pivot brakes rub horribly during climbs. Cam based single pivot brakes such as Zero-Gs don't quite solve the problem since the ramp of the cam calls for specific pad spacings for proper use. Here too are some problems.

A steel frame can last for a long time and will take the scrapes and dings. What's wrong with updating the parts over the years with modern bits if it fits.

What is wrong with updating metal frames? There were quite a few beautiful Italian frames made in the 1970s. Steel, however, has come a long way since. The late 1980s and into the 1990s saw a burst of real innovation: microfusion lugs, ultra-thin and oversized multishaped heat treated steels, filet brazing and scientific testing ... Before the 1980s bicycles were very little engineering.. Masi was a legendary frame maker but that was in the 1950s and 1960s. What makes Masi so dear to many of us is not the frames that his son Alberto made but San Diego days.. The Prestige is a nice bicycle but very much a product of its era. Cast lugs and Columbus SLX tubes. The Prestige is a bicycle for L'Eroica.

D we really know what the lifespan of a carbon frame is yet? Does it even have to have one?

How 'bout the lifespan of the groups? The latest and greatest are electronic. EU rules mean that the boards don't use lead, e.g. have their destiny to wastedumps in their production. Spares? Forget it..
And the mechanical groups? Campagnolo is still one of the best but try to get spares. What is available is horribly overpriced and a lot of what once might need is not available... In many cases these days repair means replacement even amongst the finest grouppos...

So I think we agree then