Quantitative Pulley Comparison
Frustrated with the lack of hard data on the various pulley offerings and following Turner1's idea I decided to start to put this together. Please update values/answers and repost the entire section with your updates.
Please screen grab your updated spreadsheet as well (as I did here below). The google docs spreadsheet should save your updates to the actual spreadsheet in real time.
Link to Edit
PS: I realize I have put all of the easy information together here. The sizes of the pulleys are key here.
PSS: For the single pulley systems all of the %'s should be the same and will just be the size ratio of the new pulley diameter / OEM pulley diameter. I suggest we all measure consistently at the peaks of the aluminum ribs on the pulleys. The troughs might be technically a bit more accurate but likely too difficult to measure accurately. Either way a caliper is going to be required. Obviously do not measure the diameters on the inner or outer edges of the pulley as they are larger than the part actually driving the belt. For the two pulley systems we will obviously need the diameters of both OEM and replacement pulleys. I am happy to do the math if anyone can provide all the diameters. I am also happy to take single diameter values and hold them until we get the other corresponding diameter to have the ratio - just PM me ANY diameters you have!
PSSS: I am willing to bet that in some cases the claimed power gains will not be consistent with the measured sizes. This will be a great vendor honesty test!