Dura ace 7900 compatibility with R8000

[email protected]

I've recently swapped out my 6700 crankset for an R8000.

All seems well but now contemplating replacing the 6700 FD & RD with R8000 but will these work with my Dura ace 7900 (10 speed) shifters ?

Thanks

Matt

MattFalle

Pretty sure not as 8000 is 11 speed and pull ratios are different from 10 speed, but why not give it a bash and see what happens - sometimes stuff works that doesn't.

daniel_b

The front would potentially work, but I can't see anyway that an 11spd rear derailleur has any chance of working with a 10spd front shifter, and presumably still a 10spd cassette?

Personally I would stick with what you have, and upgrade to 8000 when you can get all the parts at the same time.

MattFalle

i'd get a full 11 speed 105 groupset from Wiggle in their 50% off sale tbh if you want to go that way.

better than 8000, will work out cheaper.

MattFalle

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ugo.santalucia

Rear won’t work

[email protected]

I'm not quite up to speed with modern groupsets, i understand you get different pull ratios between manufactures and potentially the same with different series of components.

It's a bit late to go down the full groupset replacement route, but historically i found that the shifters do all the work for the FD &RD, cable pull from a 10 speed shifter should in theory be the same on a FD/RD so as long as the cassette is the same speed (10 in this case) it should work. But if no firm answer i'll probably pass on this.

MattFalle

Also remember that there were massive problems with 8000 shifters (the lefts broke all the time, at one point Shimano GB ran out of stock due to warranty exchanges) so personally I'd avoid.

daniel_b

[email protected] said:

I'm not quite up to speed with modern groupsets, i understand you get different pull ratios between manufactures and potentially the same with different series of components.

It's a bit late to go down the full groupset replacement route, but historically i found that the shifters do all the work for the FD &RD, cable pull from a 10 speed shifter should in theory be the same on a FD/RD so as long as the cassette is the same speed (10 in this case) it should work. But if no firm answer i'll probably pass on this.

Are you aware the R8000 groupset is 11 spd?

I think you can get away with it on the chainset you have changed, as it's able to handle the marginally wider 10 spd chain.
The rear derailleur though will be indexed for 11 cogs, in the space (Or very close to) of a 10spd cassette.

trevor.hall12

[email protected] said:

I'm not quite up to speed with modern groupsets, i understand you get different pull ratios between manufactures and potentially the same with different series of components.

It's a bit late to go down the full groupset replacement route, but historically i found that the shifters do all the work for the FD &RD, cable pull from a 10 speed shifter should in theory be the same on a FD/RD so as long as the cassette is the same speed (10 in this case) it should work. But if no firm answer i'll probably pass on this.

Merlin are doing big discounts on R8000 right now .Might be worth a look