Out of all the bikes I've been on the back of over the years, and there have been many, the one I have the fondest memories of was THE most unreliable, uncomfortable, bone-rattling, gorgeous looking, lovingly restored, loud piped, temperamental beeatch of a 1959 Triumph Tiger 110.
We spent nearly as much time pushing her along the road as we did riding her and it took a few minutes before you found your land legs again after having your toenails vibrated off when you had to do any motorway stuff, but hell I loved that bike! (More than her rider, ultimately!
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24 years ago, when I spent a summer working in the States for a biking family, I spent much of my time defending the merits of Japanese bikes, as they were just as bad for Harley loving as others are for Harley knocking. As far as they and all their biker buddies were concerned if it wasn't HD, it was "Jap crap".
My heart will always return to custom bikes, as I love their individuality, as well as the skill and imagination that goes into building them, but I can appreciate various stock bikes too, from classic Brit bikes to the latest sports bikes... I'll never invest in a romper suit though
OK so it's impossible for me to rate a bike on its ride/handling qualities yet, but I can sure appreciate everything else about it, and dream of the machines I would hope to own one day.