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Cross crankset on road bike - front derailleur height adjustment
I recently purchased a Specialized Roubaix frame from a member of this forum. I intend to build it up with Ultegra 6800 and would like to run a 11-28 or 11-32 cassette. The fact is, I have no use for a 50-11 high gear. On another bike (with band-type front derailleur) I went with a cross crankset (46/34) and find that the 46T large ring is far more useful for me.
Before I order a cross crankset I'm curious if the slot in the braze-on will allow me to get the front derailleur low enough to run a 46T big ring. Anyone have experience with this? Thanks. |
#2
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#3
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pro-tip: if you use a triple FD, you can mount the fd a little higher than you normally would and it will shift fine.
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#4
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I came across this the other day, and it seems like this could be the perfect application for it (barring it doesnt sit the FD too low). I have never used it, but WickWerks makes solid products, and it isnt too expensive!
https://wickwerks.com/products/fit-link-adapter/ Last edited by gt eunuch; 06-28-2016 at 07:49 AM. |
#5
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From my "back of the envelope" estimation, if you have ~1cm of slot below the bolt with the derailleur properly positioned for the 50, you should be golden.
Of course, I could be totally wrong, and often am. What type of cassettes are you on? Is there a chance you could find a "junior" cassette that starts at 13? There's nothing magic about an 11.
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It's all fun and games until someone puts an eye out... |
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or just hand build a cassette with the gears you want
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Last edited by wallymann; 06-28-2016 at 08:31 AM. |
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The WickWerks option is interesting, though from my reading it looks like it may lower the FD too much, as it's designed for an even smaller chainring than 46T.
I looked at junior cassettes, but the only one I found is 14-28. That's not high enough with a 34-50 crankset. (I'm tough to please!) As for custom cassettes, I'll have to see what options I have, though with cogs riveted together onto carriers I may be limited in this regard. I may just have to mount a 34-50 crankset that I have, position the FD, and see how much room I have to lower it. My calculations show that I'll have to move the FD about 8mm lower switching from 50T to 46T. |
#9
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http://bbbcycling.com/bike-parts/cassettes/BCS-11S
another option, they have some crazy gearing choices, including an 18-28 (frame clearance may suffer on this though? How many frames can hold a 18 in the outboard position?) |
#10
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Not trying to derail your approach, but the issue isn't whether you need a 50/11, as much as whether you like riding a 50 x 13,14,15,16,17,18,19,21 etc. Those are the gears that determine whether a 50 is right for you. Similarly, your 34 may be used mostly with your 12, 13, 14, and so on.
I've ridden a couple bikes with the Wickwerks adapter. On both it barely works with a 44 front ring. It does throw in a little bit of flexibility into the shifting system, not enough to really feel it with manual shifting but definitely with Di2. |
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#12
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If there's room for it in the derailleur you're going to use, you might drill & tap a second hole higher up. Check that you'll get enough engagement between the tab & derailleur, before committing, though -- hold it up there first and see what it looks like.
Or, grind the tab off the frame and use a clamp-style derailleur. One caution: I put a 46-tooth ring on a bike recently and found that the derailleur's cage hit the chainstay -- had to use a different one. Make you've got room to move the thing down as far as you want! Ditch the derailleur and go single-chainring? C'mon, all the cool kids are doing it... |
#13
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erm, i'd just try it with the existing fd location.
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Agreed, I bet it will work.
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#15
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One of the reasons I'm against braze on FDs.
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