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Old Dura Ace .... will this work?

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Old Dura Ace .... will this work?

Old 09-24-17, 11:42 AM
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dim
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Old Dura Ace .... will this work?

I have an early 1980's Koga Miyata Full Pro. It has the old downtube shifters, and I'm looking at upgrading to the old Dura Ace 7800 groupset with a 7900 compact crank (50/34)

I have already bought the 7800 rear derailier and the 7800 front deraillier. I will get the 7800 brakes and the 7800 shifters

I'm looking for a compact crankset and the Dura Ace 7900 has a 50/34 compact crankset. (none in 7800)

my 'fast bike' has really good wheels with Shimano 105 10 speed. I'd like to use these wheels from time to time on the Miyata, so it would be good to just swop the wheels and not worry about having to change the cassette (I am using an 11-28 toothed casette on the cog (10 speed), and am looking to get the same spec casette on the Koga Miyata ... the spec says that the 7800 rear derailier is suited for a 27 tooth (max) .... will a 28 work with the the rest of the dura ace components that I'm looking at?

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Old 09-24-17, 12:04 PM
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Yes, everything should work together just fine.
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Old 09-24-17, 12:10 PM
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Originally Posted by rccardr View Post
Yes, everything should work together just fine.
thank you
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Old 09-24-17, 12:19 PM
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I believe Shimano brought out the R700 crankset for 7800 group users that wanted a high quality compact. But your choices are so many.
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Old 09-24-17, 12:31 PM
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Would keep an eye on the 7800 FD, I had one, and it corroded really badly, and eventually cracked, have seen other for sale on ebay over the years with the same corrosion (something I haven't seen/experienced with other Shimano FD from the same time or newer)

For the STI's these are old enough that spares (like genuine hoods) will be hard/impossible to fine (Hudz did/do aftermarket) the same with front caps, so be aware of this when looking.
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Old 09-24-17, 12:37 PM
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Originally Posted by desertdork View Post
I believe Shimano brought out the R700 crankset for 7800 group users that wanted a high quality compact. But your choices are so many.
I know .... but it's got to say ' Dura Ace' .... this bike will cost me a fair bit to get it sorted the way I want it ... I really like the Velo Orange Grand Cru Drillium crankest (34/48) but it does not say Dura Ace

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Old 09-24-17, 01:17 PM
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Originally Posted by dim View Post
I know .... but it's got to say ' Dura Ace' .... this bike will cost me a fair bit to get it sorted the way I want it ... [/IMG]
If you really must have Dura Ace, would just get R9100, there are many issue with looking at 10 speed, you have built in obsolescence, hard to find/non-existent NOS parts, in the UK there are 3 main sources of old bike parts, ebay, Facebook sales groups or retrobike (in the UK, we don't have co-ops like the US seems to), have a look at eBay and see how much 7800 there is on it, not a lot.

The problem with Dura Ace is that it was high end, and will most likely have been used hard, probably be 2 or 3 owners now (7800 is well over 10 years old now(2004 released))and will be worn out/crashed by now, additionally support for spares is long over, Shimano normally cover for 3 generations, 7800 is 4.

Would try and avoid 7900, generally that generation is regarded as the worst Dura Ace Shimano have put out, it didn't last long, again, very little availability.

For compatibility 10 speed from then is not compatible with 10 speed today (4700), Shimano isn't going back, so your stuck with an obsolete system, with very few spares.

If you were willing to look further down the hierarchy, then availability improves as they were more mass market, although you are still looking for hard to find parts.
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