Riding is cheap on gas, but owning a bike isn't just the sticker price. Insurance, a solid helmet, decent armored gear, and routine maintenance add up fast. The best time to shop is late autumn. Dealerships want floor space for winter inventory, riding season is over, and private sellers would rather take cash than pay for winter storage.
Getting a good deal comes down to two separate tasks: negotiating the out-the-door price first, then picking the cleanest way to pay for it without giving your savings away to dealer loan interest.
Remember that a 0% intro APR is a hard deadline, not free money. If you have a remaining balance when the 15 months end, the standard variable interest rate applies to whatever is left. Stick to the $500.00 monthly schedule so the bike is completely paid off before that happens.