28/30 granny rings

Sir HC
Sir HC Posts: 20,148
edited December 2008 in MTB workshop & tech
Anyone know if they exist? As I am after a 30/36 double ring setup, rather than the 22/36 setup.
Intense Socom
Inbred

Comments

  • supersonic
    supersonic Posts: 82,708
    28 do, but maybe a different BCD to what you require.

    But unlikely the front mech will handle such a low difference between the chainring sizes without having the mech higher than normal which may cause other problems.
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  • dave_hill
    dave_hill Posts: 3,877
    Try googling Highpath Engineering - get one of their custom machined rings (not cheap but uber-cool).

    Can't see why your front mech would be a problem, but if it is try a road mech.
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  • Sir HC
    Sir HC Posts: 20,148
    I didn't think the mech would be a problem. I thought it would shift easier than jumping from 24 to 36 at the moment.
    Dave, thanks for the link, I'll ring Highpath on monday.

    THe other option is to use a 32tooth middle ring and have some spacers made, unless my MRP spacers will work.
    Intense Socom
    Inbred
  • supersonic
    supersonic Posts: 82,708
    If the chainrings are similar sizes, the inside of the cage can rub on the next ring down. Most mechs are specified with a top-middle minimum difference, usually 10t with MTBs. Of course this is a two ring set up, and middle/lower, but the same principle should still apply I think.
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  • nicklouse
    nicklouse Posts: 50,673
    shimano do 26 and 28 104mm bcd ones and maybe a 30 out there have a look at the more touring spec cranks.
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