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48,38,28 Chainset to 42,32,22

  • 04-11-2015 9:16pm
    #1
    barrymanilow
    Registered Users, Registered Users 2 Posts: 548 ✭✭✭


    Hi all,

    I have an older steel touring bike that I picked up off donedeal . Ive been looking at upgrading the drive and at the same time thought I might change the gearing . Its a 48,38,28 triple at the moment and I had my eye on a shimano acera 42,32,22 . The bike has a 7 speed cassette at the back . I never go up to the big ring as feels way too high for the kind of cycling i do . Then when the bike is loaded and I'm tackling hills I often wish I had a lower gear or two . It seems like the gearing on the bike is set up way too high for loaded touring .

    So would this be a simple solution and swapout ? , could it be even too low ?is there anything to watch out for ? I'll also be getting a new BB to match the new crank .

    Thanks for any advice,

    Barry


Comments

  • #2
    cdaly_
    Registered Users, Registered Users 2 Posts: 6,440 ✭✭✭cdaly_


    Bear in mind that the difference between 42x14 is the same as 48x16 so swapping the chainset only moves you by one high gear. On the other hand a 22 granny ring gets you a 25% easier lowest gear (assuming a 25t sprocket).
    Is it a 7speed cassette or freewheel? If it's a freewheel, you can get a 14-34 'megarange' block for around €31 http://www.evanscycles.com/products/shimano/tourney-7-speed-megarange-freewheel-ec025606 which gives you a lower gear than the 22t granny ring and might be just the thing for the tough hills.


  • #3
    barrymanilow
    Registered Users, Registered Users 2 Posts: 548 ✭✭✭barrymanilow


    cdaly_ wrote: »
    Bear in mind that the difference between 42x14 is the same as 48x16 so swapping the chainset only moves you by one high gear. On the other hand a 22 granny ring gets you a 25% easier lowest gear (assuming a 25t sprocket).
    Is it a 7speed cassette or freewheel? If it's a freewheel, you can get a 14-34 'megarange' block for around €31 http://www.evanscycles.com/products/shimano/tourney-7-speed-megarange-freewheel-ec025606 which gives you a lower gear than the 22t granny ring and might be just the thing for the tough hills.

    Thanks , its a cassette , one where the 7 rings can come off and on individually and not one connected block


  • #4
    cdaly_
    Registered Users, Registered Users 2 Posts: 6,440 ✭✭✭cdaly_


    http://www.evanscycles.com/products/shimano/alivio-hg20-7-speed-cassette-ec042969 has a 12-32t option which should do the trick.

    Alternatively, it's not that hard to make up a custom cassette to suit your requirements. I've done it where I got a worn out MTB cassette and used the big sprockets to add granny gears to a road cassette.


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