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Difference between road and mtb cassettes

PBoPBo Posts: 2,493
edited October 2010 in The workshop
Is it just the ratios, or weight/durability - or is there some other fundamental difference that means I'd have to replace like with like?

ta

Posts

  • tywin1tywin1 Posts: 7
    Road cassettes generally stop at about 27t. MTB ones go up to 34t or more, like with the new XX stuff.

    Replacing a road cassette with an mtb one will give you a wider range of gears, but it usually won't work if the derailler has a short or medium cage.

    Weight-wise, road cassettes are lighter because the cogs are smaller, hence less material.

    Does that help? :)
  • The RookieThe Rookie Posts: 27,747
    The only fundamental difference is the number of teeth on the gears.

    Road Mechs won't work with MTB cassettes where the largest gear has more than circa 27/28 teeth (depending on model), nothing to do with long/short cage really, they simply can't accomodate the phyiscal size, even if the 'capacity' is correct.

    tywin is right, the lower weight is mostly due to the fact the gears are smaller.

    Simon
  • gbsahne001gbsahne001 Posts: 1,961
    just replaced an MTB cassette on the BSO for a Tiagra 8 speed cassette I had kicking around and the difference is staggering. Smoother changes faster top speed but it also means it's not quite as flexible going off road.

    As it spends most of it's life on road, don't really have a problem with this.
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