Go to the Wabi site. My memory is the Classic frame and fork is only 1 lb heavier. your body weight will vary more than a pound! Much of the 1 lb difference is the Lightning has a CF fork but steel steering tube. The Classic is substantially cheaper, has eyelets for fenders and rear rack and will handle much larger tires. Bottom line is you gain a lot of options with the Classic and save significant amount of money. If you are unhappy with the Classic you would have been unhappy with the Lightning. In my situation I bought a 650c wheel size, think TT has the same size Lightning, and the Lightning was made of scandium. The result is I have a 16.5 lb bike with front and rear brakes, drop bars, Sugino 75 cranks and 1/8 heavy high quality track chain and porky San Marcos Rolls steel saddle. Oh and heavy high quality track hubs. Wheels are Mavic Open Pro not a light weight wheel. I could drop 1 lb easily maybe up to 2 lbs but i would give up reliability for super light weight. And I put on 5-6 lbs this winter I need to get rid of. When I get dropped from a group it isn't due to the weight of the bike; it's the motor