The motorcycle isn't the issue here.

The issue is that you're in a relationship with someone who gives ultimatums instead of understanding that a partnership is about give and take and negotiation.

Today, the ultimatum is the motorcycle. Next month, next year, the year after, the year after that - it will be something else. Then, somerhing else. Then, something else.

Another possibility is that -underneath her seemingly childish demand - driven by her concern for your well-being - is something you're not telling us. Do you ride with a group of hooligan friends? Have you been ticketed by the police for speeding 3 times in the last year with triple digit speeds stamped on the ticket? Does your bike have a extended swingarm, drag tire, aftermarket exhaust and thousands of dollars in engine mods? Maybe your girlfriend is actually a sane and reasonable person and has recognized self destructive behavior in you that makes it difficult for her to imagine a future where you mature into being a great father, and lifelong companion?

If the first part is true - she is being a manipulative child and you've given no cause for it - drop her. It's going to keep coming up. Next year it will be an ultimatum over buying a ring. A year later it'll be setting a date. A year later, kids. Everything becomes an ultimatum because she's controlling.

But wait..

What if shes the voice of reason?

What if you're just Too Fast and Too Furious for your own good? Are you one of those guys with Peter pan syndrome who aren't marriage material because you refuse to grow up or think of anyone but yourself? IS your bike a rolling speeding ticket generator? In that case, the problem isn't the motorcycle, it's your attitude. Your riding friends are probably bad influences, one or more of which will likely have a pegs-down incident within the next 5 years. Your bike, the way you ride it, and the way you talk about riding it makes your girlfriend think you're a stunted man child who will die badly because of poor impulse control and this scares her. She wants you in her life -and figure, possibly forever - but thinks you're a reckless twat who's most certainly going to kill himself.

If the second case is true, thats a tough one. You're probably going to have to make painful changes. Sell your crotch rocket, buy a really boring looking standard style bike, buy some gear for her and go on rides in the country together. Stop going on group rides with your hooligan loser friends. Play poker, watch movies, do anything but ride with them, they're probably enablers that encourage your dangerous behavior.

I was blessed that my last girlfriend - an amazing person for many reasons - loved my motorcycle and couldnt wait to ride. I've been trying miserably to find another one like her and failing completely.

So which is it? Your girlfriend is controlling? Or you're reckless with more bike than self control? A combination of both?