I've been bashing my shins on my Carbent high racer's Superman handle bar, since I bought it new in 2009. Progressively added spacers to the riser to raise the bar height, until my forward vision became somewhat blocked. As a result, I stopped riding the bike. A shame, since it's my lightest bike and best hill climber. Purchased a Metaphysic bike with tiller steering in 2016. No shin bashing and full forward vision on that bike. Recently, I started toying with the idea of converting the Carbent to tiller steering. Finally, decided to go ahead and do it. Ordered a Performer tiller assembly from RBR in Pennsylvania for a little over $100. The steerer tube on the bike's carbon fork presented a problem. I expected it to be fabricated of aluminum, but instead it was all carbon with a large minor diameter internal thread. Had to drill the thread out and ream the ID with a Harbor Freight reamer to get an expanding plug star nut to fit the inside of the steerer tube. Was going to leave the steerer tube its original length, so the steering conversion would be reversible, but the steerer tube wall was so thin, decided to cut the steerer tube shorter for safety's sake. Used a 60 mm carbon headset spacer between the headset and steering block. Rode the bike on yesterday's Clown ride to test the conversion. Shallow learning curve, since I'm used to the tiller steering on my Meta bike. Really pleased with the result - no shin bashing, and I can see where I'm going.
Carbent with stock superman bar
Carbent's stock open cockpit
Carbent with tiller steering
Carbent's closed cockpit. Replaced the old ICE headrest with ICE's latest version. Also, installed an ICE tail light mount adapter.