All systems after 7970 are broadly compatible (eg you can use 6770 sti and FD with a 6870 RD to get 11 speed). However 7970 has a different cable width and is not compatible with everything subsequent. A disadvantage of going 1st generation !
I don't think the 7970 RD will stretch to 32, the recommended limit is 27 from memory, although I have run 28 with no problem. I have read of people using a medium/long cage and replacing the short cage. Tbh this is beyond my technical comfort level and obviously voids any warranty.
I actually bought the individual items from Ribble. 6870 RD medium cage and then matching FD and STI levers. Every few weeks ribble does a circa 10% discount and then prices are very good (RD is currently £133, so with discount came in at £120). This was based on going 11 speed which means additional cost of wheels and cassettes. Unfortunately you cannot do a 10 speed long cage (unless you do the hack I mentioned above) because they didn't do the 6770 in a longer cage and it is the RD which determines whether it is 10 speed or 11 speed.
I have attached an article I found useful in setting out various compatibilities
I don't think the 7970 RD will stretch to 32, the recommended limit is 27 from memory, although I have run 28 with no problem. I have read of people using a medium/long cage and replacing the short cage. Tbh this is beyond my technical comfort level and obviously voids any warranty.
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All systems after 7970 are broadly compatible (eg you can use 6770 sti and FD with a 6870 RD to get 11 speed). However 7970 has a different cable width and is not compatible with everything subsequent. A disadvantage of going 1st generation !
So is there any simple way of using an 11-32 cassette on a 7970 Di2 system?
http://www.bikerumor.com/2012/10/17/hac ... erailleur/
I am just building a bike for the hills. Ended up buying a 6870 upgrade kit with the medium cage 6870 to go with 11-32 cassette.
Thanks.
I have attached an article I found useful in setting out various compatibilities
http://carltonbale.com/shimano-di2-ever ... d-to-know/
Had a look at my set-up and no-way will the RD top jockey clear a 32 cog (currently 28 with b-screw at max).
Thanks again.
Hi
Could you verify that I can use RD-7970 10 Speed DuraAce with 11 speed Cassette through all gear range without a problem ?