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Gear Question

I have full ultegra components with a...

I have full ultegra components with a triple on the front and an 11-27 cassette on the back. I also have a medium length cage derailler. I would like to put the SRAM PG-1070 11-32 cassette group on the back and have been getting mixed opinons as to whether my existing medium lenght cage is sufficient or if I need to go to a long cage. Does anyone know the answer?

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To determine what capacity you need I have always used the following formula: cap req'd (T) = (BIG ring - small ring) + (BIG cog - small cog) and then based on that Shimano cages provide the following,Shimano long = 45T; medium = 33T. Hope that helps.