Wheelbase, Length, Width, Height, Ground Clearance and seat height of Triumph Rocket 3 are 1665 mm, 2500 mm, 886 mm, 1066 mm, 140 mm, and 750 mm respectively. On the other hand, the dimensions of Harley Davidson Fat Boy are 1665 mm, 2370 mm, ~990 mm, ~1,095 mm, 115 mm, and 670 mm respectively.
Harley Davidson Fat Boy feature a low saddle height of 670 mm which will be accessible as per your requirements. Moreover, we would suggest you to take a test ride for a better understanding of comfort and compatibility. You may click on the link and select your desired city for dealership details.