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  • why do shimano disc rotors ( and others) come in 160/180 then 203 mm?
  • kaiser
    Free Member

    why are some rotors ” odd sizes ” rather than just in 20mm increments ?
    why do hope choose 183mm ?
    is there a good reason?
    please enlighten me

    Posted 12 years ago
    xiphon
    Free Member

    Hope have used many different sizes over the years – to make you buy more of their products?

    140,145,160,165,180,183,185,200,203,205,225… probably more to add to the list.

    Posted 12 years ago
    RustyMac
    Full Member

    Different manufacturers use different sizes. Some based on metric sizes some imperial. For example 203mm = 9 inches.

    By using different sized rotors it means the roters are not nessicerily directly transferable between brands so if you change manufacturer of brakes you also need new rotor and mounting hardware too. basically meaning more money for them.

    Posted 12 years ago
    mboy
    Free Member

    203mm = 9 inches.

    ???

    203mm = 8 inches

    The annoying thing is a lot of manufacturers call a 160mm rotor a “6 inch” rotor though, when it’s clearly a 6.3″ rotor… Grrrr!

    Posted 12 years ago
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