I love my wife more than anything on earth but...
Why did you say "but"?
I'll rent a Harley Davidson bike and ride it.
Sounds like she just wants you safe without the harley. You should not talk down on her just because she worries about your safety.
I am going to have a Harley Davidson bike although she doesn't want me to have it.
Don't you think this will make her angry and upset? You shouldn't buy this bike, it could hurt your marriage.