Dura Ace components identification
09-25-20, 06:56 PM
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Dura Ace components identification
Are these the a 7100 model, made in 77 or...?
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09-26-20, 01:08 PM
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Pretty sure both the brakes and crank are Dura Ace EX, certainly could be 77-ish.
Can be hard to definitively distinguish between early DA cranks from the first several series, but could easily be a GA300.
Can also be difficult to tell the difference between EX brakes and the prior series, but to my eye the EX ones had a more defined edge to the triangle in the brake arm.
Can be hard to definitively distinguish between early DA cranks from the first several series, but could easily be a GA300.
Can also be difficult to tell the difference between EX brakes and the prior series, but to my eye the EX ones had a more defined edge to the triangle in the brake arm.
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09-26-20, 03:33 PM
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The calipers are Dura-Ace EX, aka 2nd generation Dura-Ace, and specifically part of the longer reach BR-7210 set. These were introduced in mid-1978 and produced though the 1984 model year. Ex calipers are easily identified by the stiffening web on the inner arm. extending below the cable adjuster to above the brake mounting ear. EX also introduced the Allen Key nuts.
The crankset is Dura-Ace, aka 1st generation Dura-Ace or at least it is configured as such. The crankset was used in this form for the 1972-1978 model years as GA-200. For 1978 it received an option of lighter chainrings with the inner web removed and a groove milled into the outer web. In this configuration, it was offered as GA-210. Renumbered, first as GA-300 and later as FC-7110, the version with the lightened chainring served as the crankset for the Dura-Ace EX group until the proper FC-7200 crankset was introduced for the 1986 model year. After that, it continued as the FC-7110 though to the end of the 1984 model year.
The crankset is Dura-Ace, aka 1st generation Dura-Ace or at least it is configured as such. The crankset was used in this form for the 1972-1978 model years as GA-200. For 1978 it received an option of lighter chainrings with the inner web removed and a groove milled into the outer web. In this configuration, it was offered as GA-210. Renumbered, first as GA-300 and later as FC-7110, the version with the lightened chainring served as the crankset for the Dura-Ace EX group until the proper FC-7200 crankset was introduced for the 1986 model year. After that, it continued as the FC-7110 though to the end of the 1984 model year.
09-26-20, 03:54 PM
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All of the DA stuff I have seen have the model parts number some place on the back side of component and date code. As sai8d these look to be early 7200 ex series components.
09-26-20, 05:04 PM
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Thank for all your replies.
I also found the brakes on Velobase, being the model BR-7210, long reach. The short reach are 7200.
I still do not know for sure the year of the crank. It is marked S and A, as seen in the picture.
It doesn't fit in the chart from Vintage Trek.
Somebody said that the letters R, S, T were used for 73, 74 and 75, but not sure.
I also found the brakes on Velobase, being the model BR-7210, long reach. The short reach are 7200.
I still do not know for sure the year of the crank. It is marked S and A, as seen in the picture.
It doesn't fit in the chart from Vintage Trek.
Somebody said that the letters R, S, T were used for 73, 74 and 75, but not sure.
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1992 Torelli Nitro Express; 1972 Claud Butler.
1992 Torelli Nitro Express; 1972 Claud Butler.
09-27-20, 04:58 AM
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Yes, the date codes starting with R, S or T are pre-1976. However, it's interesting that there is only one letter. Typically, even the pre-1976 codes used on Dura-Ace had two alpha characters. Still, they do appear to be pre-1976, first generation Dura-Ace. I believe the 'A' is the mold cavity indicator.
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