After switching to a "real" mountain bike and the upright seating position so I come not really handle it. At first I had gone pain in the sitting bones, which are a few rides, but this is not disappeared, are skin irritation, redness on Übergan of buttocks to thighs. Apparently the saddle is easy too wide for this position.
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On the homepage, the "Aero" product group is also more likely to recommend for race-like sitting position, so the problems are more understandable. Despite a point deduction for it, I would not have changed the bike, it would have been 5.
Whoever sits slightly stretched here can safely access, but you should know about his seat bone distance before / measure anyway.