i have a 05 636 that i use as a daily driver for the past 2 years. its been regeared from stock (15/43) to (14/44) and ive praticed mainly power wheelies
now i bought a 50t rear but dont know how long of a chain i would need.

thanks

 

120 link chain will be plenty. It will actually only use closer to 114-115 with a 520 14-50 setup. If your looking to get one, we've got them on hand.