Hack
Join Date: Sep 2015
Location: Ottawa, Ontario, Canada
Posts: 1,265
Bikes: TrueNorth CX bike, 88 Bianchi Strada (currently Sturmey'd), Yess World Cup race BMX, Pure Cruiser race BMX, RSD Mayor v3 Fatbike
Mentioned: 4 Post(s)
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Quoted: 347 Post(s)
Only thing about the Core (and all the direct drive trainers) is that you need to have 130mm rear spacing, and some 7sp were still the older 126mm - though if your old bike is steel you can just spread it, without even bothering to cold-set it.
Other than that - yea, get a 7sp cassette and go to town. It's a complete blast, and you won't enjoy it any less on a 7sp bike than you would on the latest and greatest 12sp.
I have a Kicker V5 (current version), Core, and had a Snap - to me, the Core is the sweet spot in the lineup - though if your bike is spaced at 126, the Snap would deal with that better.