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Thread: Going from a triple to a double - what don't I know?

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    jrenaut's Avatar
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    Default Going from a triple to a double - what don't I know?

    My "I don't have the kids but the fixie is impractical for this ride" bike is a 2013 Bianchi Volpe. It came with a triple up front - 50/39/30.

    I'd like to switch to a double. The only time I ever use the small ring is when I accidentally downshift, and then I use it only long enough to get back into the middle ring.

    Can I just replace the crankset and the front brifter? Or is there more to it than that? Since Shimano sells 2X10 and 3X10 derailleurs, I assume i'd have to replace that, too. Would I have to do 50/39? And how do I get the crankset off?
    Last edited by jrenaut; 02-11-2017 at 02:28 PM. Reason: starting my research

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    Quote Originally Posted by jrenaut View Post
    My "I don't have the kids but the fixie is impractical for this ride" bike is a 2013 Bianchi Volpe. It came with a triple up front - 50/39/30.

    I'd like to switch to a double. The only time I ever use the small ring is when I accidentally downshift, and then I use it only long enough to get back into the middle ring.

    Can I just replace the crankset and the front brifter? Or is there more to it than that? Since Shimano sells 2X10 and 3X10 derailleurs, I assume i'd have to replace that, too. Would I have to do 50/39? And how do I get the crankset off?
    I believe the crankset width is slightly different between a double and triple. If you can find a matching double, it should work. This, with a double FD and a matching shifter should be all you need. A compact double is 50/34, which should work well for you. Lastly, most current Shimano cranks can be removed with just a Allen wrench, but you will need a special tool to remove the bottom bracket, if necessary.

    Good luck!

    Sent from my XT1575 using Tapatalk

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    Why not try adjusting the limit screws and cable tension so your brifter can't drop to the granny? If it works you can then decide whether to go full weight weenie and remove the small ring.

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    Go single ring! It is awesome.

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    Shifter, derailleur, crankset should be all you need, but you should also redo the cables/housing while you're at it. Getting the crank off will depend based on the manufacturer, but it shouldn't involve special tools unless you also need/want to swap out the bottom bracket as well...and if you're already pulling the crank off you might as well at least pull out your BB and re-grease everything.

    For the Volpe, you'd probably want to stick with a 50/34...but if you move to a 53, search online and make sure you have the clearance for the bigger crank.

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    Definitely don't get a standard (39/53) crankset; that would needlessly limit your range and really doesn't make any sense anywhere there are any hills.

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    If you do decide to go 1x (which really is great), beware that the 1x rings are often offset inboard, so you won't be able to fix as large a 1x ring as a regular ring. But 1x means new rear derailleur and new cassette. No need to replace your font shifter, though, unless a non functional shifter paddle offends you.

    And probably no need to replace your crankset if going to 1x, since you don't care about FD alignment with the double. Chain line might be a little too far outboard, but it likely won't matter.

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    My double is 46/36, and I almost never get onto the smallest cog with the big ring around here. I guess I'm not as much of a beast as all y'all.

    Would a new derailleur really be necessary? Doesn't the indexing in the shift lever execute the proper spacing independently of the derailleur? I suppose there could be trouble with the limit screws being too wide on either end...or is there some angle to the movement of the derailleur that is different for 2x?

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    Yep - FD, 2x brifter and crankset. Most non-powermeter cranksets come with chainrings so you wouldn't re-use those from your 50/39/30 (which probably use a 130/74 BCD anyway).

    Some typical road/gravel/CX chainring combos are 53/39, 52/36, 50/34 and 46/36 (for cyclocross). I'd suggest a 34 as the small ring instead of a 39, for the same reasons as hozn mentioned. Though a 36 would be okay too with the wide range cassettes available these days.

    You will probably need a tool to get the preload cap off the crankset. I would probably get one of these if you expect to service Shimano BB/cranksets often. It's also the same one used with SRAM GXP, and quite a few other BBs. (You can also use it with Centerlock disc rotor lockrings with external notches.)
    http://www.parktool.com/product/bott...ket-tool-bbt-9

    When choosing a crankset just be aware that chainrings are not quite as interchangeable across manufacturers as they used to be so your choice may limit you to certain brands of chainrings in future. Shimano now use 4-bolts instead of 5 on their chainrings. SRAM still uses 5, although newer ones have one of the five recessed behind the driveside crank.

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    I think 1x is a little too inflexible. I do sometimes use this bike for dragging a bunch of groceries you the hill.

    52x36 sounds perfect. Just a little bigger in the big ring, but a little smaller in the small one.

    Sent from my XT1650 using Tapatalk

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