In my last post I talked about having some trouble (aka getting stuck) getting up the very steep hill on my commute without my BionX. I knew that something felt wrong at the time, but I wasn’t able to confirm it right away. With each pedal stroke (which were necessarily very vigorous pedal strokes) the entire velomobile heaved backwards on its rear shock. At the same time that this happened I was feeling some incredible resistance. Well, it turns out I was basically bottoming out the shock and my tire was rubbing on the underside of the shell’s wheel well. It’s like I was hitting the brakes every time I pushed on the pedals. You can see rubber residue and worn fiberglass in the photo here.
I imagine this has been happening for some time at least – especially those times that I accidentally catch some air when I’m flying down our bumpy streets. I’m also guessing that I didn’t notice the problem on the hill earlier because the BionX evens out the torque, so the velomobile doesn’t rock as much. Either that or the BionX just powered through the friction. In any case, not a good situation.
My solution was to craft a tire guard that will keep the velomobile body from bottoming out on the tire. I made the guard out of a piece of aluminum flat bar because it is light and easy to work with. It attaches to the axle, and small tabs (not visible here) bend into the dropouts to keep it oriented vertically. We’ll see how it holds up.
Now that I have this installed as well as my new, refurbished BionX battery (still waiting on my old one to get repaired), I don’t think I should have any trouble tackling the hill of death once again.





