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One of the interesting discussions that has been on here in the past has been the braking ability of the Ventures and the relative effects of items such as swapping caliper/rotor/master cylinders and the benefits of de-linking the first gens. I came across an article on another site which is linked below discussing the ratios between the master cylinder area and the caliper area and the effects on braking. http://www.vintagebrake.com/mastercylinder.htm I created a chart that shows some of various Yamaha bikes and these related calculations for anyone that is interested. There is a screen picture attached as well as the excel spreadsheet if you want to experiment with various combinations. Bottom of chart also shows calculations for de-linking brakes on a 1st gen. Explanation of the numbers shown: Master Cyl dia: The I.D. of the front or rear master cylinder bore Master Cyl. Area: The area of the I.D. of the master cyl. Piston Dia. A: The I.D Of the 1st piston bore or only piston bore in a 2 piston setup Piston Dia. B: The I.D Of the 2nd piston bore, only shown in a 4 piston setup Piston area A: The area of the piston bore of piston A Piston area B: The area of the piston bore of piston B (if used) Total Caliper Piston area: Total area of the pistons in a caliper assembly Rotor Dia.: O.D. of the brake rotor Ratios are expressed as : Piston area/master cyl area:1 (numbers shown in graph do not have the :1 shown. Didn't know how to do that in excel 2003) If you find any errors in this, let me know & I will correct. Gary http://i1007.photobucket.com/albums/af193/gdingy101/ratiospreadsheetpicture3.jpg