Using 7 speed shifters with 8 speed cassette?

Discussion in 'Mountain Bikes' started by gclark8, Mar 5, 2006.

  1. gclark8

    gclark8 New Member

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    Using 7 speed shifters with 8 speed cassette, anyone doing this?

    I have lady friend with a Giant Upland. It is fitted with 7 speed EF29 shifters and a 7 speed HG30 14-28 cassette.

    The bike is fitted with a TX71 crankset (28/38/48) however it is too slow. I have a spare 8 speed cassette 11-32, the top 7 cogs being 11-28, the overall spacing (7) seems to be the same for both cassettes, 32mm.

    This could save buying a new 7 speed cassette and make use a spare 8 speed MTB cassette. Comments? :)
     
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  2. slaw

    slaw New Member

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    Should work, but chain might not be aligned perfectly in all gears. I've often swapped 7 speed and 8 speed wheels on bikes with 7 speed or 8 speed shifters, and each combination works to a degree. For the last couple of years or so on my commuter, I've been using 8 speed shifters on a 7 speed freewheel and it sounds like some gears are not quite perfectly aligned. I'm soon to upgrade that bike to an 8 speed wheel.

    Anyway, it's easy to try it out and see.
     
  3. slaw

    slaw New Member

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    Forgot to say that the 8 speed cassette won't fit on the 7 speed freehub. If you remove one cog, you might need a spacer instead. Not sure of the exact numbers, but check Sheldon Brown's site, he has all the details.
     
  4. gclark8

    gclark8 New Member

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    Thanks for that info, I will go to his site and have a look. I may have to buy a better 7 speed cassette or dismantle one of the old 8s.
     
  5. gclark8

    gclark8 New Member

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    Well, I'm glad I waited. The lady brought the bike over today and surprise, surprise, a 7 speed spin-on 14-34 Mega Range Freewheel!! :eek:

    I ordered a Shimano MF HG50 11-28 7speed freewheel from the LBS. :cool:
     
  6. gclark8

    gclark8 New Member

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    I decided to offer her a speed option:
    a pair of 650c "training wheels",
    the Front, a Deep-V with a Conti Gator Skin, 650x23,
    the Rear, a road rim on a Deore hub with a Conti GP, 650x23
    use the 11-32, 8 speed MTB cassette, the 32 tooth not selectable,
    this will make one horny ladies MTB/Tri-training bike! :D
     
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