2009 Stumpjumper 1X? conversion?- Mtbr.com
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  1. #1
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    2009 Stumpjumper 1X? conversion?

    So this year i decided to buy a new 29" stumpy and came to realise how much i like the 1X12 gearing so does anyone have any advice on what i can do to update the 2009 stumpy fsr comp to something similar 1X?

    https://www.specialized.com/gb/en/st...r-comp/p/22466

    Or..... am i being an idiot and should i leave well alone, and just accept they are totally different machines

    Advice?

  2. #2
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    The 11 speed Shimano cassette should fit on your existing hub. If your crank can take a 104 BCD narrow wide ring...you're good to go. On top of the cassette...you'll need the 11 speed rear derailleur, shifter, chain, and a narrow wide chainring.

  3. #3
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    Thank you for the quick reply! Would have been a miracle to get 12 on the back but 11 isn't too shoddy!

    If i read the post linked below correctly then it looks like this will actually be quite a simple conversion.

    https://forums.mtbr.com/drivetrain-s...nk-940110.html

  4. #4
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    You can basically have 12 speed gearing with 11 speed if you go with an e13 9-44 or larger cassette.

  5. #5
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    Quote Originally Posted by ianhandley2000 View Post
    Thank you for the quick reply! Would have been a miracle to get 12 on the back but 11 isn't too shoddy!

    If i read the post linked below correctly then it looks like this will actually be quite a simple conversion.

    https://forums.mtbr.com/drivetrain-s...nk-940110.html
    You really don't need the 12sp. Shimano has an 11-46 cassette. Its only 4 teeth less than SRAM (or 5 less if you're looking at the Shimano 12sp) on the low gear than a 12sp. What gives the 12sp the larger range is the 10T cog. You can just run a 30T up front to get a similar low gear as the 12sp with a 32T up front. Unless you plan on pedaling at 30+mph on a regular basis...the 11T shouldn't be a deal breaker.

  6. #6
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    Thanks for the advice guys 11 speed it is going to be, I will make a start today looking for parts and will update this posting in case anyone else can benefit from this.

  7. #7
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    You can also go with 10-speed and get the same gearing. Your 2009 might already be 10-speed, so you might only need cassette, chain, clutch derailleur and narrow-wide chainring. Would save only the shifter, but that's something. Check out new Shimano Deore m6000 series.

  8. #8
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    Why not 12X?

    Quote Originally Posted by ianhandley2000 View Post
    So this year i decided to buy a new 29" stumpy and came to realise how much i like the 1X12 gearing so does anyone have any advice on what i can do to update the 2009 stumpy fsr comp to something similar 1X?

    Advice?
    Not sure why you should't go 12x? I put an 12X SRAM NX cassette on the rear wheel of my 2003 Specialized epic (originally 9 speed) that then went on a 2006 Titus Motolite. The cassette fit without a problem but the smallest cog rubbed on the derailleur hanger screw. I put a small spacer on the axle and it workes great.

  9. #9
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    The cheap upgrade route to 1x11 is to go with something like:
    Sunrace 11-46 cassette
    Shimano SLX shifter/derailleur
    KMC 11 spd chain
    Chinese narrow-wide chairing to suit your preferred gearing

    Keep in mind that on 11x or 12x conversions you might need to mess around with bottom bracket or chainring spacers to get a good chainline that doesn't jump when backpedaling.

    However, if you care more about having a particular range rather than ideal gear ratios you might be able to get by with a really cheap 1x9 option: keep your rear mech and switch to an 11-46 9spd cassette (ZTTO) and hopE that the extension link allows the derailleur to function well. The latter option can be done for about $25 compared to the range of $130-150 for a 1x11 and a good bit more for a 1x12.

  10. #10
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    Desertride you have pretty much managed to guess my shopping list for the 1X11 with the exception I went for a raceface narrow wide chain ring rather than a generic chinese one. The courier has unfortunatley made a real mess of my delivery though so until they get their act together i am now stuck with the bike in pieces. Might have a look at converting it to tubeless whilst i am at it.

  11. #11
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    What did you end up going with and how is it working? I have basically the same bike and wanted to change mine as well. How do you like it?

  12. #12
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    I have a 2008 Trek Fuel EX9 I just completed a 1x9 conversion on.
    Here is my parts list:

    SOLODRIVE 104BCD Single Chainring 32T
    $23
    https://www.amazon.com/gp/aw/d/B01A7...b_b_asin_title

    Bike Chain Guide
    $23
    https://www.amazon.com/dp/B07TQ38C91..._T9KFDbNSCJAK0

    JGbike Sunrace M990 11-40T BLACK including 22mm derailleur extension
    $37
    https://www.amazon.com/dp/B01MRLWHEO..._4eLFDbGNFD06E

    SRAM PC 951 9sp chain
    $16
    https://www.amazon.com/dp/B001A0A8KG..._0fLFDbB7FX96P

  13. #13
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    Roll Out using a 2.10" tire
    Front 32t

    Rear
    11t=240'' 13t=203'' 15t=176''
    18t=147'' 21t=126'' 24t=110''
    28t=94'' 34t=78'' 40t=66''
    ________________________
    Front 30t

    Rear
    11t=225'' 13t=190'' 15t=165''
    18t=137'' 21t=118'' 24t=103''
    28t=88'' 34t=73'' 40t=62''

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