You can get either a threaded or threadless fork for the Rush or at least you could in the past. I know I ordered a threadless fork for my older Rush frame at first and returned it for a threaded.
Soma Lugged Track Fork - Outside Outfitters
It's 1 inch threadless but easy to shim to 1 1/8" for standard threadless stems.
Also at that price point for a frame you could get a Pake Rum Runner which will fit 28s.
Originally Posted by
TejanoTrackie
While I truly love my Soma Rush, just keep in mind that it has a threaded steerer tube that requires a threaded headset and a quill stem. If it were me, I'd look at something similarly priced like an All-City Big Block, which also has track geometry and clearance for wide tires.