When comparing double cradle and singe downtube the double cradle frames are more stiffer and stable. Other than the type of frame handling depends on like rake,trail, wheelbase etc.
Nowadays racing bikes use a different kinds of frame other than these two, like twinspar, deltabox, trellis etc. But during the 70s and early eighties, when doublecradle/singlecradle types where in use, most of the racing machinery had double cradle frame rather than single. And that makes sense.
During the hundred cc brigade of yore the bike with the best stability was KB100/125. RX is also a good handling and more nimble than the KB. And the Suzukis were the ones i didn't like in handling dept.
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Suckin\' gas and haulin\' a**!
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