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  1. #1
    mtbr member
    Join Date
    Dec 2013

    Whats the biggest "Capacity" front derailleur you have ever seen?

    I am currently looking at a Sora FD3503, bottom pull, 50T capacity.

    Front (Big-Small) + Rear (Big-Small)

    Is this a Road or MTB front derailleur?
    Whats the biggest capacity FD made today?

  2. #2
    B A N N E D
    Join Date
    Apr 2007
    Quote Originally Posted by matt4x4 View Post
    Is this a Road or MTB front derailleur?

    48 tooth large chainring would be the largest.

  3. #3
    Sneaker man
    Reputation: mik_git's Avatar
    Join Date
    Feb 2004
    ever seen... I've got a 52 mated to a Deore front mech, that works fine, but it ain't new thats for sure.

    I wouldn't think (well I guess i wouldn't know) it's not the capacity of the maximum, it's what it works with. From memory this 52 is mated with a 26 and 38 (could be wrong, i'm not going couting any more teeth), but it wouldn't work very well if is was with a 22/34 middle and inner.
    All the gear and no idea.

  4. #4
    mtbr member
    Reputation: Eric Malcolm's Avatar
    Join Date
    Dec 2011
    3x triple MTB front derailleurs are designed with 22/32/44 Chain-wheels in mind. Road 3x Shimano Ultegra FD runs 28/32/52. The design difference between MTB and Road is in the arc that curves from the lower bridge to the open front end - on a MTB at 44T, this is obviously a tighter radius than is required for a 52T. And a 52T has a bridge too high up off the chain-stay of your bike to be able to run 22T. The problem is in the cage dimensions. To get the 22T working, change the chain-set to an MTB triple and accept a lower top gear ratio as your max. It is what it is....

    If I don't make an attempt, how will I know if it will work?

  5. #5
    mtbr member
    Join Date
    Dec 2013
    I got a hybrid Octalink crank from a Specialzed Crosstrail that has 48/32/22 (which is not the stock "48Ax36Ax26A w/chainguard" - I think I swapped them out years ago) I will use it on my MTB, my capacities seem to work out good, just swap out my 64mm 22 to a 28 for $8 from Niagara. I was just interested in them 50+ tooth count chain rings, but like you said those are for road bicycles, which would need new gear to operate.

    Is there a strength/longevity difference between Octalink and Square/Diamond Taper, or is the debate just preference (sp)?

  6. #6
    mtbr member
    Reputation: Ruffstuff's Avatar
    Join Date
    Jan 2015
    Square taper eventually wear oval/looser fit, octalink/isis isn't meant to & the hollow axle is meant to save weight

    Single speeding fat lad

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