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  1. #1
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    Replacing a 50t chainring with a 48t

    from the bike website, this is my front crank: TruVativ Touro Cross aluminum arms, TruShift 36/50T Chainring, 110BCD

    Want to replace the top-end 50t ring with a 48 or even a 46.

    http://cgi.ebay.com/Sinz-48t-Expert-...item439f4bf1b5

    or this

    http://www.niagaracycle.com/product_...ucts_id=404395

    would those work? I'm thinking b/c 110 BCD.

    I've never done anything like this...tips?

  2. #2
    Senior Member Retro Grouch's Avatar
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    I'm thinking it should be pretty much a straight bolt up. You'll probably want to lower your front derailleur just a skosh. You'll get slightly better shifting if your new chainring has "shifting aids" built into it. Your small chainring is probably just a flat ring now so you shouldn't have to worry about whether they match.

  3. #3
    Insane Bicycle Mechanic Jeff Wills's Avatar
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    Quote Originally Posted by Retro Grouch View Post
    I'm thinking it should be pretty much a straight bolt up. You'll probably want to lower your front derailleur just a skosh. You'll get slightly better shifting if your new chainring has "shifting aids" built into it. Your small chainring is probably just a flat ring now so you shouldn't have to worry about whether they match.

    I think the original Touro crankset had shift pins on the outer chainring, so you might notice slightly worse shifting action. I doubt you'll notice the change after the first day, though. If it does become a problem, 48-tooth, 110mm bolt pattern chainrings with shift pins are available:
    http://harriscyclery.net/product/fsa...r3952-qc49.htm
    Jeff Wills

    All my bikes.

  4. #4
    coprolite fietsbob's Avatar
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    your LBS can supply an aftermarket chainring to suit your needs ,
    Retail shop, Harris orders from QBP,
    ( the wholesale distributor , that supplied that picture)
    and so can your local shop.. most have a QBP account.

  5. #5
    Senior Member
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    If your front derailleur is a braze-on type there could be a problem getting it low enough.

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