Easily mounts directly to a set of ProTaper 1 1/8" bars. The end of the bar fits standard steel bars or thick aluminum. I have tried the extra bits and you easily gripped the standard yamaha TW200 steel bars but they need to be assembled properly align the slotted bits with the internally slotted bits so they can expand and grip large enough to accommodate all levers, So cleaning the master and switches on a street legal TW200 should do the trick, overall I'd happily recommend them.
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