help - 6/7 speed compatibility

jkm
jkm Posts: 80
edited September 2007 in Workshop
is the spacing between cogs on a 6 and 7 speed freewheel the same?

i have just aquired a 1995 dawes stirling (brand new unused) and want to convert it over to flat bars.
it is currently running 3x6 but i can pick up some very cheap Shimano revoshift 7 speed shifters and am not sure if they would be compatible? i was just intending to set it up so you couldenet select seventh.

Comments

  • maddog 2
    maddog 2 Posts: 8,114
    8 is one sprocket more than 7

    so it would be reasonable to assume that 7 is one more than 6

    and 6/7/8 spd chains are identical, which would also support this view

    Don't know for definite though
    Facts are meaningless, you can use facts to prove anything that's remotely true! - Homer
  • nicklouse
    nicklouse Posts: 50,673
    jkm no probs with what you plan.
    "Do not follow where the path may lead, Go instead where there is no path, and Leave a Trail."
    Parktools :?:SheldonBrown
  • Monty Dog
    Monty Dog Posts: 20,614
    You'll just have one spare 'click' on your shifters - perhaps you can trade it to someone who wants to convert from 9 to 10 speed? :D
    Make mine an Italian, with Campagnolo on the side..
  • aracer
    aracer Posts: 1,649
    According to the bible on mixing different numbers of gears at http://ctc.org.uk/DesktopDefault.aspx?TabID=3946 it's different (why do people reply when they don't actually know?) 6 speed is 5.5mm between cogs, 7 speed is 5mm between cogs. So no it won't work. However the table there would suggest that it can be made to work by rerouting the cable at the rear mech - the "old Dura Ace" mod.
  • nicklouse
    nicklouse Posts: 50,673
    Opps i had better tell my hack bike to stop working then.

    either that or i have some magic spinone cluster. or some magic twist grip changer.


    ok it is only used to go to the shops/pub etc but works fine.

    but as that chart implies that the spacing is different and you would be way out at one end of the cluster when set correctly at the other end.
    "Do not follow where the path may lead, Go instead where there is no path, and Leave a Trail."
    Parktools :?:SheldonBrown

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