If you check out the elevation data via the Web it gives a grade of 462.8% at the peak of the first mountain. It was steep, but I didn't think over 90% was possible. Maybe because we were having to push the bikes up gradients about 45 degrees that Strava got confused. If you are into mountain climbs then come to Taiwan.
Wow, big climbs and great scenery.
Yeah, we are not doing the 4000m climb to cross the middle. Heard it is the best ride in Taiwan, but not on tandems laden with gear and kids. 800m is enough.