Chainline and 42 / 16 + 42 / 13 on a flip flop hub

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  • Running a 42 chainring with a 16 and a 13 sprocket, flip flop hub

    Usual disclaimer, can't find this elsewhere, can remove if it does exist somewhere else.

    I want to run a road gear and a track gear on the flip and flop of a Halo hub. 42:16 for road, and 42:13 for track.

    Assuming there's enough room in the dropouts to counter the chain length variation between these two sprockets, does anyone know if the chainline will be unrideable with such a big variation? I think Sheldon's site reckons on 3mm per tooth, so this would be 12mm.

    Sounds too big a gap, but is anyone running a similar difference? It's a sugino messenger crankset, dura ace sprockets, halo hub, dolan precursa frame / dropouts.

  • chainline or chainlength? I think you need the length question answered, no?

  • Mainly the chain length question, but someone told me today that running different sprockets affects chainline as well? Do you know if that's true? It hadn't occurred to me before, but I hadn't had to think about it before!

  • Sprocket size doesn't (usually) affect chainline; the chainline will only change if one sprocket is dished (i.e. doesn't sit centrally on its threads) and the other isn't, or if your axle has spacers on one side but not the other (i.e. your hub isn't central in the dropouts - so when you flip the wheel around the hub will 'move' to one side).

    What Sheldon was talking about is axle movement in the dropout - that is, with a variation of three teeth, you'll need 3x3=9mm movement in your dropouts (plus enough room for your axle nuts).

  • Sheldon is talking about the amount the wheel will move back n forth in the dropouts (3mm per tooth)

    Dont think the chainline will be affected...

  • yeah ^^

  • Thanks. Think when I read that bit on his site I must have wanted to read 'line' instead of 'length'... d'oh

    Mmm... 9mm should work, I'll check it out when the frame turns up and pick up the 13 sprocket when I've tested it with the wheel.

    Fanks for the advice all!

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Chainline and 42 / 16 + 42 / 13 on a flip flop hub

Posted by Avatar for foiegrashellscape @foiegrashellscape

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