Bicycle Mechanics - shimano 105 headset adjustment

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yeahbikes

08-19-06, 10:18 AM

what sized headset wrench is required to adjust this? theres a few different sizes of headset wrenches and I'm unsure. dumb question, might as well ask. all i'd need would be that one wrench correct?

thanks.

CHenry

08-19-06, 10:23 AM

32mm.

HillRider

08-19-06, 10:43 AM

You need two wrenches, one should be a 32 mm "headset" (i.e. thin) wrench to set and hold the top race flats. The second can be a regular 32 mm open end or adjustable to tighten the top nut. Also note that headset nuts and races have octagonal (8-sided) wrench flats, not 6 like almost all other fasteners.