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  1. #1
    Senior Member
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    Can I Change my 48 Tooth Gear to a 50 Tooth One?

    I have two bicycles I use to commute: a 1993 Cannondale H400 and a 2014 Fuji Absolute 3.0 LE. The Fuji has a gear set of 48/38/28. The Cannondale has 50/40/30. I am not yet able to take full advantage of the top end of either but was just wondering if I could change my Fuji to have a 50 tooth gear to match the Cannondale. The Cannondale has a Shimano Altus A10 Derailleur. They are cheap. I understand there is a Shimano R453 that I might be able to use also. If it involves anything more, I would not consider it. Could anyone give an opinion?

  2. #2
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    My opinion is absolutely don't bother. I could find no Fuji 3.0 in the 2014 model year on Fuji's site, but it lists an 8 speed 3.0 for 2012. That bike has a 11 tooth small cog (insane on an 8 speed with a 32 tooth large cog, but that's another story). You will just about never use the high end as it sits, and going to a 50 tooth will just create a larger jump between chainrings. A 48/11 combo is good for a minimum of 35mph, and you won't even come close to spinning out on it until over 40mph. You will never be able to take full advantage of a 48/11 because there is no advantage to it.

    p.s. I just looked up the specs on the C'dale - high is 50/13, MUCH lower high gear than the Fuji.
    Last edited by cny-bikeman; 01-02-15 at 06:23 AM.
    There's no such thing as a routine repair.

    Don't tell me what "should" be - either it is, it isn't, or do something about it.

    If you think I'm being blunt take it as a compliment - if I thought you were too weak to handle the truth or a strong opinion I would not bother.

    Please take the time to post clearly so we can answer quickly. All lowercase and multiple typos makes for a hard read. Thanks!

  3. #3
    Old fart JohnDThompson's Avatar
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    As long as the outer chainring can be removed from the crank (some are permanently swaged to the arm) it should be possible. You may need to lengthen the chain.

  4. #4
    7-speed doomsday prepper ThermionicScott's Avatar
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    +1. Wait until you're spinning out your top gear regularly before making it higher.
    Quote Originally Posted by chandltp View Post
    There's no such thing as too far.. just lack of time
    RUSA #7498

    ISO: 49T 130BCD 3/32" road chainring, preferably silver and classic-styled.

  5. #5
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    You're comparing one set of chainrings to another without saying what cogs you have in the rear. Without that information we can't even say that your gearing is different or the same between the bikes.

  6. #6
    coprolite fietsbob's Avatar
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    Questioning your Ability (IDK) or asking permission ?, Yes , in that Case.

  7. #7
    Senior Member Shimagnolo's Avatar
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    Bikepedia does not have a "2014 Fuji Absolute 3.0 LE", but PerformanceBike does, probably a PerfBike model OEM'd by Fuji.
    Specs on crankset just say "Fuji Triple
    48/38/28" which tells me nothing.
    Photos show a
    4-armed crank, probably a Shimano "trekking" crankset with Fuji's name slapped on.
    I'm not aware of any chainring larger than 48T for those cranks.

  8. #8
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    There are also a technical reasons not to do this. The front chainrings on newer bikes are designed to work as a matched set. The teeth, ramps and pins, and the shape of the front derailler are all timed together so the chain can move smoothly from one ring to the next. With an unmatched set it may shift very slowly if at all, and you may not be able to shift from the small ring to the middle without catching the big ring. You would need to replace at least the 2 larger rings.

    More important in front ring selection is minimizing front shifts. My gearing is set up so I never need to shift the front ring on my way to work. The stock gearing had me front shifting about 6 times each way, which really sucked.

  9. #9
    Senior Member Retro Grouch's Avatar
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    Most likely you can swap chainrings but, if you aren's spinning out in your highest gear now what would you be gaining?

    There may be some other issues with the larger chainring. If your chain is right at it's maximum now, you may need to add a couple of links. You will probably have to raise your front derailleur which will mean you'll have to readjust it's cable.
    My greatest fear is all of my kids standing around my coffin and talking about "how sensible" dad was.

  10. #10
    Senior Member
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    I am not planning to make the switch right now. It was just an idea. I ride the Fuji most of the time. The Cannondale is a little too big for me.

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