When I bought my trike, I added on quite a few accessories incuding the parking brake lever set. I didn't realize what a great thing this was when I ordered it - it doesn't appear in the top ten list of popular accessories and, after all, it is a parking brake - not something to get terribly excited about. But it is the very last accessory I would give up. I consider it almost essential. I would recommend this to everyone with a trike. Incredibly useful and convenient.