I think Shimano are working on about three years each iteration for their groupsets. Latest Tiagra were 2012 then 2015 so the next one, whatever speed it is, not likely to be out for a couple of years yet.
I reckon Tiagra could stay at 10 speed for a while. There are a lot of 10 speed tiagra, 105 and ultegra bikes still out there and if a part needs replacing then I think a lot of people would be happy to use a tiagra cassette or even a shifter rather than upgrade an entire groupset.
Was a stupid question in the first place, but if you really must know the answer, Tiagra will remain 10 speed until Ultegra, and probably 105 are 12 speed.
As DA is not even 12 speed yet, don't hold your breath
FWIW I hated the old Tiagra, but new Tiagra is v nice IMO.
I reckon Tiagra could stay at 10 speed for a while. There are a lot of 10 speed tiagra, 105 and ultegra bikes still out there and if a part needs replacing then I think a lot of people would be happy to use a tiagra cassette or even a shifter rather than upgrade an entire groupset.
So I reckon it may well stay 10 speed for a while
The problem is, it is not backwards compatible with the 4600 components and they have deleted the 12-30T cassette.
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It came out middle of last year.
Early model has a numerical working title..........105
It won't be electronic but it might get manc33 up his hill.
Considering Tiagra 4700 has just come out this year and Shimano have 3-4 years between each groupset iteration, probably about 2019-2020.
I think half the reason Shimano has so many groupset options is to give bike manufacturers different price points for complete bikes.
So I reckon it may well stay 10 speed for a while
Was a stupid question in the first place, but if you really must know the answer, Tiagra will remain 10 speed until Ultegra, and probably 105 are 12 speed.
As DA is not even 12 speed yet, don't hold your breath
FWIW I hated the old Tiagra, but new Tiagra is v nice IMO.
I miss him!
obviously left you're driving glasses at home...
The problem is, it is not backwards compatible with the 4600 components and they have deleted the 12-30T cassette.