A friend has asked me to fix the gears on her Toys R Us bike. Something like this:

Yes I know!
Unfortunately the rear (twist) shifter is broken so I need a replacement. I was thinking of using one of these SRAM 3.0 as its only £4 and comes with a new cable. But I don't know if I need 2:1 or 1:1 actuation?
Does anyone have any experience with the really cheep (Falcon) shifters? I'm trying to keep thinks as cheep as possible otherwise I'll spend more then the bike cost.

