Bicycle cassette (rear chainrings) standards - article comments

  1. Tim mi
    17/08/2019 at 06:46
    This is very helpful, thank you.
    We have added links to your site.
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    Nick Sutton
    22/07/2020 at 05:01
    Thank you so much. All of the size variations together in one place. I am drawing in CAD for my own bicycle construction project and this little nugget was just what I needed.
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    James E Estelle
    21/08/2020 at 00:26
    Could you add the dimensions for Shimano 12 speed MTB to table 1?
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    26/11/2020 at 19:14
    ‘Spacer thickness’ means ‘Thickness of spacer groove’?
    Sorry I am not good at english.
    If you didn’t mean it, how can I know the thickness, width and length of spacer groove ‘FH-R7070’ ?
    Additional, I want to know the thickness of crank grooves
    Thank you
    • 3fd0d771d754ced79ca6b702635900b5.jpg

      27/11/2020 at 10:31
      I mean “thickness” as in “how much space it takes on the freehub”. Looking at the dimension going from the wheel, towards the outside of the bicycle.
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    06/12/2020 at 14:41
    If I want to mount am 8s Campy cassette, how many spacers should I use in the standard campy free hub? maybe you could help me with that… Thanks!
  1. Max Mertins
    02/05/2021 at 22:25
    I bought a wheel on the flee market and the cassette has 8 splines with equal distances. Is it an old campa 7 speed ?
    thanks and greetings
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    30/10/2021 at 19:08
    Shimano MTB and ROAD are the same
    Cassette pitch is 3.78 mm
    Sprocket thickness is 1.60 mm
    Spacer thickness is 2.18 mm
    See yourself on Shimano pdf exploded views at
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    30/10/2021 at 19:29
    Link for the shimano docs
    Link for the XT 8000 cassette
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      30/10/2021 at 19:34
      I couldn’t find where Shimano states the dimensions and cassette pitch.
      Or at least admits that 11-speed road and MTB cassettes can be mix-matched (i.e. that they are compatible) – which seems to be the case in practice, at least in my experience.
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    30/10/2021 at 19:39
    On the bottom of all the shimano pdf cassette (link on my last comment) there is the parts and on these parts the spacer thickness is indicated.
    • 3fd0d771d754ced79ca6b702635900b5.jpg

      30/10/2021 at 20:12
      Yes, the spacer thickness is specified and that is the same width.
      Edit: I’ve updated the article by adding a link with more details, since editing the calculated spacer thickness doesn’t tell the whole story in my opinion and because an 11-speed MTB cassette will not lock on an 11-speed road freehub without an additional spacer.
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    30/10/2021 at 19:43
    on my first comment i have forgeted to say that its for the shimano 11 speed cassette
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