I had extensions in case they were needed, but no - no extensions of TBW or controls necessary for these. I can't say whether longer clutch and brake cables are needed, as I had gotten braided cables for those to go on at the same time and ordered them 2" longer than stock just in case. But since the others fit without extensions, I'm betting the clutch and brake cables will also. They are 12" grip height, but do go up to 14" before coming down for the grip. Many others on the board have reported (despite dealer claims otherwise) that extensions are not necessary for 12" bars.