Road vs MTB cassettes

PJPenrouz
PJPenrouz Posts: 136
edited September 2007 in MTB workshop & tech
I've already asked in the Road forum to no avail.
http://www.bikeradar.com/forums/viewtop ... t=12543167
Basicaly, can I use road 10-speed cassete on a 135mm MTB (disk) hub?
Perha[s the MTB forumites will know...

Comments

  • ddoogie
    ddoogie Posts: 4,159
    Yes, the space between the cogs is the same on 7,9 and 10 speed cassettes is the same. I'm unsure as to whether you would need to use a 10-speed specific chain, however, as they are thinner than the 9-speed chains.

    I'm sure Nick/Supersonic will fill in the blanks!
    S-works Stumpjumper FSR

    I'll see you at the end.

    You'll see me on the floor.
  • Will Snow
    Will Snow Posts: 1,154
    is it for an mtb??? I just ask because for light offroading i wouldnt trust ten speed. Stuff gets too thin (mind you, i think 8spd is enough)
    i ride a hardtail
  • cowie
    cowie Posts: 268
    Yes.

    http://www.descent-world.co.uk/index.ph ... &Itemid=82
  • supersonic
    supersonic Posts: 82,708
    8,9 and 10 speed freehubs are the same, but the spacing between the cogs of the cassettes isnt.
    GT ZASKAR CARBON TEAM

    VOODOO CANZO

    Come and see me at https://www.facebook.com/biketyke/
  • Big Red S
    Big Red S Posts: 26,890
    Yeah, it'll fit.

    You'll need a 10-speed chain and (presumably flat-bar) shifter, too.

    WMB or MBR did it a while back - 10 speed Dura Ace/XTR XC bike.
    http://avi.co/doc/Forums.html
  • supersonic
    supersonic Posts: 82,708
    Steve Worland has custom set up with flat bar shifters.
    GT ZASKAR CARBON TEAM

    VOODOO CANZO

    Come and see me at https://www.facebook.com/biketyke/
  • ddoogie
    ddoogie Posts: 4,159
    supersonic wrote:
    8,9 and 10 speed freehubs are the same, but the spacing between the cogs of the cassettes isnt.

    If the spacing between the cogs is different, then how does the rear mech move the chain the correct distance if the distance the mech is moved remains constant?
    S-works Stumpjumper FSR

    I'll see you at the end.

    You'll see me on the floor.
  • supersonic
    supersonic Posts: 82,708
    Thats why shifters are different. Rear mechs are dumb - they do whatever the shifter says. The shifter pulls the mech the right amount, specific to each speed. If you were correct, then 10 and 9spd shifters would work on 8spd, and they dont. 7 and 8spd are the same however - but the overall casette is wider.

    IIRC - 8spd gaps are 4.8mm, 9spd are 4.35mm and 10sp are 3.9mm.
    GT ZASKAR CARBON TEAM

    VOODOO CANZO

    Come and see me at https://www.facebook.com/biketyke/
  • PJPenrouz
    PJPenrouz Posts: 136
    Thanks a lot. Now, what I don't get is why is 10 speed not more widely used on XC MTB?
    Is it not strong enough?
    Another thing is the chainline - if you put the same thing on 130mm and 135mm it moves the chainline for 5mm. That surely must be adjusted on the chainset.
  • nicklouse
    nicklouse Posts: 50,675
    chain line wont change. the hub is the same.
    "Do not follow where the path may lead, Go instead where there is no path, and Leave a Trail."
    Parktools :?:SheldonBrown
  • PJPenrouz
    PJPenrouz Posts: 136
    Sorry, I didn't express myself properly:
    Let's have 2 hubs now - 130mm and 135mm and a 10 speed cassette. Surely if you put the cassette on the 135mm hub the chainline is different from the one on the road 130mm hub for what the cassette is designed.
    If my frame accepts both road and MTB wheels it will have different chainline for each wheel suppose the cassette is the same. But I can see it now - It has nothing to do with the cassette if you are saying the road and the MTB are the same width.

    Still puzzled why 10 speed is not used on MTB (not that I need it, but why the roadies need it more?)
  • nicklouse
    nicklouse Posts: 50,675
    but as you frame can not take road and MTB hubs. it takes mtb and as the freehub is the same width and as the cassette is the same width as an 8 or a 9 the chain line does not change.

    the chain line for a road hub and an mtb hub is different as are the front chainsets chain lines.

    why is it not used more. well loot at road use cadence is the be all to most people.

    cadence is less important to MTB riders.
    "Do not follow where the path may lead, Go instead where there is no path, and Leave a Trail."
    Parktools :?:SheldonBrown
  • PJPenrouz
    PJPenrouz Posts: 136
    Nick, my frame can take both hubs (cotic roadrat) - 132.5mm spacing and steel!
    I thought the chainlines for road and MTB chainsets are different. But then again - on my other hybrid bike, I have an MTB 135mm hub and a road chainset. I didn't notice any extra spacers. Weird.
  • nicklouse
    nicklouse Posts: 50,675
    the free hub and cassettes are the same between road and mtb 8,9 and 10.

    and your frame does not really take both. but can be made to by compressing or streaching the frame.

    I hope both sides compress/expand at the same rate of you will have fun.

    but as i said the rear chain line is the same for any of the above cassettes on the same hub as it is all the same.
    "Do not follow where the path may lead, Go instead where there is no path, and Leave a Trail."
    Parktools :?:SheldonBrown
  • clanton
    clanton Posts: 1,289
    Re your query about roadies needing a ten speed cassette - this is normally used in conjunction with only two front chain rings giving a total of 20 gears (of course not all useable either). With a roadie using a triple chain ring they would normally combine it with a nine speed cassette giving 27 gears, same as on most mtb bikes.
  • ddoogie
    ddoogie Posts: 4,159
    supersonic wrote:
    Thats why shifters are different. Rear mechs are dumb - they do whatever the shifter says. The shifter pulls the mech the right amount, specific to each speed. If you were correct, then 10 and 9spd shifters would work on 8spd, and they dont. 7 and 8spd are the same however - but the overall casette is wider.

    IIRC - 8spd gaps are 4.8mm, 9spd are 4.35mm and 10sp are 3.9mm.

    Cheers for clearing that up :)
    S-works Stumpjumper FSR

    I'll see you at the end.

    You'll see me on the floor.

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