Senior Member
Join Date: Nov 2005
Location: Killarney, Ireland.
Posts: 648
Bikes: Derosa SuperKing Dura ace, DA wheels, Cannondale Topstone AL, Grx, FFWD 350. Specialized Tarmac SL7 UDi2, Sworks Crux, GRX, Ridley X-night sl, GRX, Specialised Epic Comp Carbon.
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One thing you have to watch out for is wear, if you put a new chain on and use an older cassette that's well used, it will wear the chain faster.
I bought a tiagra cassette as a spare that I use on my climbing wheels 12-25. The difference in shifting is not noticable. A 12-25 cassette will be no problem when moving from a 12-26. I used mine for an 11000 vertical, 110 mile race.I have noticed no difference in the longevity either.
Spend the $20 on something else.