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  1. #1
    cs1
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    FT Der capacity problem.

    I am looking for a 28.6 ft der to complete a couple of Deore 7 sp groups. The pickings are slim to say the least. All the MTB ders I've found are for 42-44 tooth chainrings max. I have a 46 and 48 tooth. Would a road triple work? They have thumb shifters so indexing isn't a problem, their friction fronts. I would like to keep the BP set up, which is why I'm thinking about a road der. Thanks

    Tim
    1999 Waterford RSE-11, 1995 Waterford 1200, 1989 Specialized Rockhopper Comp
    1989 Raleigh Technium, 1989 Schwinn Traveler, 1986 Specialized Rockhopper
    1984 Specialized Stumpjumper, 1986 Specialized Stumpjumper and just way too many projects to list.

  2. #2
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    yes of course it will work. a campy one would work. a shimano, a suntour. friction loves diversity.

  3. #3
    Senior Member Chuckie J.'s Avatar
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    I have exceeded the maximum chainring size a little bit and discovered no issues. A derailleur designed for 44t will work for 46 or 48 in friction mode no problem. I have an XT front designed for 46-48t that I use with a 52/42/30 crank and it's indexed. Front derailleurs are a pain but friction sure softens the setup.

    Chuckie

  4. #4
    cycles per second Gonzo Bob's Avatar
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    I think most Shimano road FD's are designed for 50T-56T big ring but I've seen cross and touring bikes with 46T and 48T big rings equipped with road FDs. Conversely, I run a 46T big ring on my MTB with FD designed for 42-44T big rings. So for 46-48 you can probably use either MTB or road FD.

  5. #5
    feros ferio John E's Avatar
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    I went the opposite way, with a Shimano Titlist front derailleur, whose cage is curved optimally for something like 52-42, on a 45-42. It looks a bit weird and demands a bit of extra trimming, but works fine.
    "Early to bed, early to rise. Work like hell, and advertise." -- George Stahlman
    Capo [dschaw'-poe]: 1959 Modell Campagnolo, S/N 40324; 1960 Sieger, S/N 42624
    Peugeot: 1970 UO-8, S/N 0010468
    Bianchi: 1981 Campione d'Italia, S/N 1.M9914
    Schwinn: 1988 Project KOM-10, S/N F804069

  6. #6
    cs1
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    I have a nice Deore crank that's 48-36-26. Most ft ders have a capacity of about 22 teeth, so that shouldn't be a problem. My big concern was going from a road crank with the 52/53 tooth large chainring to a smaller touring type 48 tooth. I will be using barcons or thumbies.

    Tim
    1999 Waterford RSE-11, 1995 Waterford 1200, 1989 Specialized Rockhopper Comp
    1989 Raleigh Technium, 1989 Schwinn Traveler, 1986 Specialized Rockhopper
    1984 Specialized Stumpjumper, 1986 Specialized Stumpjumper and just way too many projects to list.

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