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In looking at replacing my disc brake rotors, and looking online I see there are different sizes available (between 180 and 203 mm). My question is, what dimension do I measure on my existing rotor? I'm assuming it's the outside diameter, but just want to be sure.

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Yep, it's the diameter. Most likey 160mm, but double check. You'll need to get the same size rotors as your old ones unless you get new adapters for your frame.

  • Before you increase disc size you need to check with the frame/fork manufacturer which disc sizes are supported. Most CC frames allow 180mm if not 160mm max. – arne Feb 21 '14 at 6:25
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Note that the thickness of the rotors may differ slightly, so you may have to adjust the brake pads a bit. Also note the difference between bolted and center-lock rotors. Most likely you have a 160 mm 6-bolt rotor though.

0

You will need to replace your rotor with the same size as you already have. It is normally stamped on the rotor, the most common size is 160mm

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