Its taken me a few years, but in her defense, it hasn't really been viable until now. I took a 2 step approach which consisted of :
a) Telling her i was buying something extortionately expensive and then haggling down.
b) Having the good fortune to point out all the nice looking bikes in the showrrom window a few yards from my house.
So firstly I told her I was buying a Lamborghini, we've talked about it at length, and this was then negotiated down (by her - but its all part of my plan...;) )to a smaller car, and then a smaller one until it ended up with me just getting a newer version of the family hatch I already had, which I couldn't see the point as its fine as it is.

But thats ok.... I was playing the long game...and she at least now has it in her head that there is going to be £xxxx spent on a vehicle at some point...
Now stage 2, our local Triumph dealer who also has a selection of other bikes taken in part ex has a midnight blue Suzuki intruder in the window, that really stood out. Now, knowing my wife so well, I know she can't resist anything blue.... so I kept pointing it out....
Then the killer shot, on lazy saturday afternoon, "lets have a stroll down and have a look in the showroom - We'll stop into the pub on the way back and have a drink."
So we get in the showroom and I said to her - "which one do you like then?" - "how lucky for me that we both agreed that the America was the bike for me - especially when I sat on it! - The saleswoman had the banter going with my wife and we ended walking out with all the price lists and brochures....
So, then we walk 10 yards to the pub and sit outside enjoying a drink.... everything in life, at that momment is perfect....I'm flicking through the clothing brochure picking out some nice new Truimpuh clothing for her etc and then.... "Can I get one then"....
"Of course you can, in fact I want you to have it..."

See its dead easy....

That was a few weeks ago, I'm just waiting on my finance to come through and I'll be ordering one. Delivery time is expected to be one week, so I'm hoping in the next few weeks to have it. I'll post up pics when I do.
Cheers,
JC