Its not a ribble or planetx equivalent. Phil has designed it from the ground up using his own design and carbon layups. Having ridden it today its a very nice bike indeed, comfy but giving good road feedback, stiff allowing for good power transfer and decent acceleration. I have to say that as the rest of my bikes are probably more relaxed that may be one reason to be feeling the differences. This bike is probably a little big for me as it is but I will be trying the next size down next week. The joys of being in between sizes!