I have an approx 10 y. o. Gemini Randonneur, with Suntour shifters and a 7 speed screw-on style cluster. Currently, I'm running a Shimano "mega-range" 14-34 cluster. However, the cluster spacings jump from 24 teeth to 34 teeth (ie, the spacings are 14:16:18:20:22:24:34).
What I am after is roughly a screw-on cluster with roughly the same range (ie, 13 or 14 teeth to 32 or 34 teeth) but more regular spacings between the cogs. Ideally, I would like something like a 13:15:17:20:24:28:34 cluster.
Shimano do not seem to have any more regularly spaced screw-on clusters (although they have plenty of well spaced 7 speed cassette-types, but that doesn't help me). My LBS has a Suntour 13-30 screw-on (13:15:17:20:23:26:30).
Does anyone know of any other screw-on clusters that are closer to what I'm after?