Ah, my old 3900 came as a bare frameset with a rigid disc fork, but I just searched through catalogs and it originally had Suntour springs. It's from 2009, newer than I thought, with both disc and rim brake fittings. I built it into a sort of gravel cruiser thing, Schwalbe Fat Frank on cross country wheels, discs and 2x10, backswept riser bar which I need to replace, my wrists don't like it, I should try it with drops.