So, just want to report that the Ransom is an excellent 650B conversion object. All you need is a whole new wheelset (doh!) with a 12mm/135mm rear axle and a new set of 12mm dropouts.
By coincidence I found that there are an alternate IDS 12mm "long" dropout available for the old Gambler and Voltage that is 10mm longer than the standard. This actually brings the axle about 8mm backwards and 5mm upwards, which works out well for adding slightly bigger wheels. After some planning and waiting for good wheel deals I have fitted a pair of 21mm (inner) Superstar Sentinel wheels. With a 2.25 ardent in the rear i have about 11mm to the seatstay bridge which is pretty normal distance on a 26" and the standard dropouts. I already had a Suntour Durolux up front and that gives me around 10mm clearance too so no need to change that.
The only niggle is that this of course raises the bottom bracket quite a bit. This I have corrected with a couple of 3mm offset bushings, bringing the BB down to about 354mm (13,9"), still a bit high but quite ok for me, riding quite technical trails, lots of pedal hits. The offset of course slacks the head angle about a degree as well but I actually had a slackset on the frame already to slack it out whick i took off and ended up at a HA of about 66°. That's perfect I think.
So I have spent about €250 on it and got a completely new bike. And I actually think it was a good investment, the bike feels more capable and actually fits the 165mm of travel quite well. Easier to roll over technical terrain and climbs surprisingly well. This while not losing any of the agility. And I think it is a quite noticeable difference.
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