40t extended range cog on 1x9 (11-34) setup - Questions- Mtbr.com
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  1. #1
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    New question here. 40t extended range cog on 1x9 (11-34) setup - Questions

    Hey y'all I'm new to bike tinkering so go easy on me. I just converted my bike to 1x9 using a 34t chainring (with my 11-34 cassette). Needless to say it's pretty burly. I'm liking that it's making me stronger and it's good to go on regular climbs, but I know it's gonna kick my ass on big long climbs (Bear Creek/Pinhoti) so I'm thinking about getting the e*thirteen extended range cog (40t).

    My cassette is Shimano CS-HG200-9 (11-13-15-17-20-23-26-30-34T).

    My questions are: Do I just need to take the cassette off, remove a cog (say 17t for example) and reassemble, putting on the 40t cog on first? Will I run into trouble trying to remove the 17t cog or is it easy enough to disassemble? How unpleasant would the jump from 15 to 20 be? Which cog would you remove if not 17? Will I have an issues with my current derailleur (Shimano Alivio RD-M4000)? Clutch style derailleur is next on the list for sure.

    Thanks in advance.

  2. #2
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    AThat's a big jump in the middle range IMO. Not much difference between 34*40 and 30*34, might be better to replace the front ring rather than extend the rear?

  3. #3
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    Good point - a 30t chainring would have probably been better in hindsight. My bike shop guy said to go at a 1:1 ratio from the biggest cog on the cassette, hence the decision to go 34t.

  4. #4
    NedwannaB
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    Does their cog 'work' on 9spd?
    Ripley V1 XC/Gravel Adventure rig
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  5. #5
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    My daughter has a 12-40t 1x9 setup on her bike using the ethirteen 40t cog. It works well although to get the "perfect" ratios I had to use a mixture of cogs from an 11-34 and 12-34 XTR cassettes.

    It works well, but it took a bit of effort to get seamless shifting with no chain drops. Basically, I also needed a narrow-wide front chainring and a 9 speed XTR derailleur modified with an XT 10 speed clutch mech and RADr cage.





    If I didn't have all of these suitable 9 speed XTR parts available in my spare parts bin, I would have just gone to a 10 speed setup.

  6. #6
    NedwannaB
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    Quote Originally Posted by TigWorld View Post
    If I didn't have all of these suitable 9 speed XTR parts available in my spare parts bin, I would have just gone to a 10 speed setup.
    ^^^This.
    Ripley V1 XC/Gravel Adventure rig
    NORCO Fluid FS
    Salsa Timberjack

  7. #7
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    40t extended range cog on 1x9 (11-34) setup - Questions

    This is much like I've put together from SRAM 970 cassettes and Hope T-Rex 40. Very easy and cheap to use Zee RD with X.9 trigger but wouldn't call ratios perfect. But good enough and simple.
    40t extended range cog on 1x9 (11-34) setup - Questions-uploadfromtaptalk1425740444644.jpg

    Sent from my Nexus 5 using Tapatalk
    Cheers,
    -Mika

  8. #8
    NedwannaB
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    Quote Originally Posted by mhelander View Post
    This is much like I've put together from SRAM 970 cassettes and Hope T-Rex 40. Very easy and cheap to use Zee RD with X.9 trigger but wouldn't call ratios perfect. But good enough and simple.
    Click image for larger version. 

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    Sent from my Nexus 5 using Tapatalk
    And the Z short cage works good with that setup? What size front ring??
    Ripley V1 XC/Gravel Adventure rig
    NORCO Fluid FS
    Salsa Timberjack

  9. #9
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    More importantly....call the police. Somebody stole your seatstays!

  10. #10
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    Quote Originally Posted by SuperBri View Post
    More importantly....call the police. Somebody stole your seatstays!
    Yeah right. My seat stays are little different...
    Cheers,
    -Mika

  11. #11
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    Quote Originally Posted by JMac47 View Post
    And the Z short cage works good with that setup? What size front ring??
    Sure, see wire mounting to match 1:1 pull ratio. Front ring doesn't play here but it's Rotor QX1 34t oval. 2.5x length chains, Campy Record C9.
    Cheers,
    -Mika

  12. #12
    NedwannaB
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    Quote Originally Posted by mhelander View Post
    Sure, see wire mounting to match 1:1 pull ratio. Front ring doesn't play here but it's Rotor QX1 34t oval. 2.5x length chains, Campy Record C9.
    I've done the 9spd SRAM/10 spd Shimano thang. I was taking about the short cage with the big cog.
    Ripley V1 XC/Gravel Adventure rig
    NORCO Fluid FS
    Salsa Timberjack

  13. #13
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    Quote Originally Posted by JMac47 View Post
    I've done the 9spd SRAM/10 spd Shimano thang. I was taking about the short cage with the big cog.
    My suspension is single pivot and doesn't have chain growth/shrink problems. Both short cage Type2 and Zee have adequate capacity and do keep chain under control without slacking. Before NW ring and after no dropped chains either.
    Cheers,
    -Mika

  14. #14
    dadamamabooboo
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    when i was running 9-speed i replaced my 11-34 with a hg-61 12-36. i swapped out the 12t for a replacement 11t and new lockring. if you don't need the lightest cassette, i'd consider that, plus moving to a 30t up front. assuming a 29'er with 175mm crank, you'd be moving from 29 to 24 gear-inches. those values will vary some with tire diameter, width and crank length. but, that's gaining the equivalent of 2 useful lower gears in that range of the cassette.
    2011 Trek Mamba 29er 21", SRAM 10-sp X9, X9 type 2 RD, SRAM X7 20(oval)/36 & SRAM X9 2X FD, Shimano XT M771 11-36, M525 hub

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