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Shimano ST EF51 Shifter/brake levers are good shifters and can be gotten pretty cheap on ebay/amazon, etc. But there are some questions about whether they are compatible with cantilever brakes. There are actually two different types of EF51 shifters. With 2 finger grip levers and with 4 finger grip levers. Only the 4 finger grip lever models are compatible with cantilever brakes. I show the difference between the two types of EF51 shifters and how to change from V-brake setup to cantilever setup.