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Bicycling - Shimano Road Bike Parts Compatibility - Di2 electronicsMar., 2015
Contents
Di2 and Electronic Shifting Compatibility Chart - 2015Electronic Shifting Compatibility Notes
Source:
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Compatibility NotesRear derailer capacity limits For Details, see derailer capacity table. Shimano charts provide for an exception to the compatibility rules between cassette sprockets and rear derailers. Specifically, only the 7900-, 6700-, and 5700- series rear derailers have sufficient capacity to support a cassette with sprockets differing as much as 16 teeth or more from small to large cog. For this reason, the 11-28 tooth cogset (17 tooth difference), available in 7900-, 6700-, and 5700- series is not compatible with the older series rear derailers. The 11-27 tooth cogset, only available in 7900-series, has the same limitation. For the older 10-speed derailers (7800-, 6600-, and 5600-series), the maximum cogset tooth size difference supported is up to 15 teeth (as in the 12-27 size). Part Naming Color Codes Shimano parts such as FC-6601 may have a 1-letter suffix, for example FC-6601-G. This letter is a color indicator and for the purposes of compatibility, this letter is ignored. The monkey can sleep easier without it, knowing the color does not affect compatibility in any part combination. Use the charts and the monkey without the color suffix. Other suffixes were for example, RD-5600-S (silver), ST-5600-L (black), where the FC-6601-G is gray. Parts with no suffix are silver, as is the suffix S, only used when there is another color option for the same part. Rear Derailer Naming and Charts The Shimano charts leave off mention of triple rear derailers, but there are important distinctions to be aware of. For the monkey and these note pages, we use the standard "03" naming convention for triple rear derailers. There are actual several possible naming conventions for rear derailers, and it is important to distinguish them. The triple-compatible rear derailers, designated on this site as RD-6603 and other IDs ending in "03", have a longer cage to be able to take up more chain, as triples run longer chains than doubles. In other places, these triple rear derailers are designated "GS" as in "RD-6600-GS". These are the same thing. One other description you will hear is "long cage" or "medium cage" to refer to road triples. On a road bike, it's considered long since it's longer than a short-cage RD used for doubles. But since there exist even longer cages (on MTBs for example), the road triple RDs are also called "medium cage" sometimes. Double Derailers: These are designated here as ending in "00" or "01". Other places use "RD-6600-SS" and other IDs suffixed with "SS", or possibly "RD-6600" short cage. There is little difference in functionality among RDs, so the Monkey learned to assume compatibility with respect to triple RDs as parallel to double RDs. Tip: for triple rear derailers, look for "GS" or "long cage" (sometimes aka "medium cage") or the "03" or "04" numbers. For double rear derailers, look for "SS" or "short cage" or the "00" or "01" numbers. Di2 7970 compatibility The electronic Di2 shifting announced in 2009 first featured Di2 7970 series. Shimano said "The new Di2 electronic group shares mechanical Dura-Ace's crankset, chain, cassette and brakes." The compatibility charts for Di2 were first released in 2015. Already, we can conclude that the 7970 series is fully compatible with the FC7900, CS7900, and CN7900. We know the Di2 derailers are all short cage only - they have no compatibiility with triple cranks. When electronic Ultegra was released, it was indicated that 7970 and 6770 would be incompatible due to different wiring. Di2 9070 compatibility As with 7970 series, Shimano's statement "The new Di2 electronic group shares mechanical Dura-Ace's crankset, chain, cassette and brakes" holds with the 9070 series as well. These components are compatible with FC9000, CS9000, CN9000, and BR9000 (with only the shifter compatibility with brake calipers shown in the '13 and '14 charts). We know there's no backward compatibility with Dura Ace 7970 due to differences in wiring. Read the next section for comments about compatibility with the 6770 and 6870 series.
Di2 Ultegra - 6770 and 6870 - compatibility
The first comment to make about Ultegra Di2 is just Shimano's original statement, which is expected if not obvious: "The new Di2 electronic group shares [the mechanical group]'s crankset, chain, cassette and brakes". This holds for the Ultegra 6770 and 6870 series as well. Shimano has kept the charts simple by excluding the Di2 components. But what about compatibility among the Di2 groups? (Added in 2015 - See Di2 Compatibility Page). There's no backward compatibility with Dura Ace 7970 due to differences in wiring. The other groups, after 7970, share the same wiring. There are user sites in Japan as well as other places assuring that there are no issues between, say, ST6770 and RD9070, or between ST6770 and FD6870. On the other hand, the 9070 upgrade kit claims it cannot be used to convert 10-speed groups as the chainring, chain, and cassette would all be mismatched.
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