Joined: Apr 2011
Posts: 4,073
Likes: 16
From: Minnesota/Arizona and between
Bikes: Bike Friday All-Day (ebike), Terry Classic, Serotta FIerte, Trek Cali carbon hardtail, 1969 Schwinn Collegiate, Kona Explosif hardtail, Catrike VIllager
The upright position may be aggravating the tailbone problem, if you can find a position where you tilt your hips forward a bit you may be more comfortable. You might try dropping the bars a bit to see what the change in position feels like. Maybe even raise the seat while dropping the bars.