I can't say anything about high bottom brackets, but, I have an EZ-1 all I could afford, and I like it, with know pain in the knees. I worked in industry for 29 years walking on hard cement floors. I can ride 15-20 miles with no problem. I tried a mountain bike, but knees, wrist and back hurt. With the EZ-1 no pain in the knees, or any other place

Roger