Lets keep it simple here.
Your bicycle is a business asset that gets entered in the Business Assets section. The bicycle is not a motor vehicle as defined by the IRS, so it's not entered in the Business Vehicle Expenses section at all.
Your expenses to repair and maintain the bicycle are entered as a general business expense.
In the Business Expenses section elect to start/update Other Common Business Expenses. The scroll down to Repairs and Maintenance and that's where you'll enter/claim all expenses related to the maintenance and repair of your bicycle.
