Can I run a 11-42T 10 speed cassette?- Mtbr.com
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  1. #1
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    Can I run a 11-42T 10 speed cassette?

    I have a 2015 Breezer repack expert and I have swapped it over to a 1x. Iíve added a 30T front ring and I am debating on running a 11-42T 10 speed cassette or spending $300 for a XT 11-46 11 speed.

    My bike is basically like new still so I almost hate to remove a perfectly good 10 speed XT setup. Iíve heard that you can run a long screw and it might work?

    I think Iíd be happy with a 42T rear and it would be substantially cheaper than going 11 speed.

    Edit:: Now that I have a 11 speed derailleur coming should I go with a 46T cassette?
    Last edited by Sickmak90; 1 Week Ago at 06:56 PM.

  2. #2
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    A friend rode that setup for a time, only problem was that the shifting was not as smooth, in alternative if your are not pleased with the shifting performance, you can just get a RD-M7000, it's a 11 speed derailleur but works OK with a 10s cassette and derailleur.
    Last edited by Aglo; 4 Days Ago at 01:45 AM. Reason: Incorrect information.

  3. #3
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    Can I run a 11-42T 10 speed cassette?

    Well Iím gonna give it a try. I ordered a cassette and B screw from Jenson. I also grabbed a brake bleed kit and some oil, all for $63. Hopefully it works.

    Iím used to SRAM x5/7 and lowerish end derailleurs anyways, so Iím not used to buttery smooth shifting.

  4. #4
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    You might want to consider https://www.wolftoothcomponents.com/products/goatlink

    This is what I did--XT 10 speed, 11- 42 Sunrace cassette+goatlink. Works great. Didn't need a longer b-screw.

  5. #5
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    Yea, Goat Link is the way to go... Iím debating whether or not to try the Sunrace 11-46 10sp...

  6. #6
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    I went ahead and got a goat link off amazon.

  7. #7
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    I use the 10-speed Shimano 11-42 cassette on a XT 10-speed derailleur (med cage). Works with the B-screw all the way in. (Although the 11-36 cassette shifted smoother)

  8. #8
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    Id pass on the goat links. You can do it right for a marginal amount of money. Id go straight to using the correct derailleur.

    Shimano makes an 10 speed 11-42 and its excellent quality, just heavy (deore level). The 11s derailleurs are cheap and work perfectly with 10s. The new deore level rear derailleur has a clutch is specifically designed to work with the 42t cassette. Ive found the SLX 11 speed rear d to be basically the same price as the 10s clutched deore, and they're functionally identical and cross compatible.

    I went with the deore 10s cassette, 11s SLX rear derailleur, and a zee shifter for my kids bike. Its excellent and very smooth. Blows 9spd XTR out of the water by a mile. Super cheap setup, but its damn good.

  9. #9
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    Quote Originally Posted by One Pivot View Post
    Id pass on the goat links. You can do it right for a marginal amount of money. Id go straight to using the correct derailleur (...)
    I agree with this, and just to mention that Shimano has a SLX M7000 10s rear derailleur.
    Last edited by Aglo; 4 Days Ago at 01:46 AM. Reason: Removing incorrect information.

  10. #10
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    Can I run a 11-42T 10 speed cassette?

    Well I already got the goat link and the HG500 is on its way. Iím gonna give it a try and if it breaks or doesnít function well I will upgrade to a new derailleur.

    I got the goat link from amazon so I could return it but I bet trying to return the cassette to Jenson would be a Pita.

    If Iím gonna get a new derailleur I might as well just spring for the SLX 11 speed kit from eBay for $182.

  11. #11
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    https://www.jensonusa.com/Shimano-SL...ear-Derailleur

    So this will work with the 42T 10 speed setup?

  12. #12
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    Quote Originally Posted by Sickmak90 View Post
    https://www.jensonusa.com/Shimano-SL...ear-Derailleur

    So this will work with the 42T 10 speed setup?
    Yes, quite well.

  13. #13
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    Quote Originally Posted by thasingletrackmastah View Post
    I use the 10-speed Shimano 11-42 cassette on a XT 10-speed derailleur (med cage). Works with the B-screw all the way in. (Although the 11-36 cassette shifted smoother)
    Same here. B screw cranked all the way in and works just fine.
    AreBee

  14. #14
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    If the B screw or goat link works what is the worst that happens? I donít ride that often so I canít imagine wear being an issue.

  15. #15
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    Cranking the b screw or using a goatlink works, its just clunky. Wear wont be an issue, it just works worse than stock, whereas using an 11s derailleur is butter smooth, better than 10s was.

  16. #16
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    Quote Originally Posted by One Pivot View Post
    Cranking the b screw or using a goatlink works, its just clunky. Wear wont be an issue, it just works worse than stock, whereas using an 11s derailleur is butter smooth, better than 10s was.
    I used a goat link my first year with the bike and agree, clunky but works. The M6000/M7000/M8000 are silky smooth on 10 or 11 speed on our Repack. If you already bought the goat link, give it a try. The Shimano cassette seems good too although my family bikes have run the Sunrace models which are a bit lighter.

  17. #17
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    My last bike had a Sram x7 rear and it was way smoother than the XT I have now. Iíve been putting off tuning it because I know Iím about to change some stuff.

    I really tempted to just try to sell all the 10 speed stuff for a few bucks and get the SLX 11 speed kit off eBay.

  18. #18
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    Can I run a 11-42T 10 speed cassette?

    Well apparently I just won a SLX m7000 11s derailleur on eBay sooo I guess Iím gonna try that.

    Since I had a 3x front with a giant ring I shouldnít need a new chain should I?
    Last edited by Sickmak90; 1 Week Ago at 05:17 AM.

  19. #19
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    It will work like a champ - https://youtu.be/1I4WzYbOb4M

    You might have to cut the chain to length though - https://youtu.be/cGjW-JJ40DQ
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  20. #20
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    Pick up a new M7000 or m8000 rear Deraileur and throw the old one in you spare parts bag. You'll be glad you did.

  21. #21
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    Can I run a 11-42T 10 speed cassette?

    Now that I have a 11 speed derailleur coming should I go with a 46T cassette?
    Last edited by Sickmak90; 1 Week Ago at 06:56 PM.

  22. #22
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    I ended up installing the Shimano 11-42 cassette and a 11 speed SLX derailleur. Everything is working great. Iím hoping I can ride soon and really test it out.

  23. #23
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    Quote Originally Posted by Aglo View Post
    A friend rode that setup for a time, only problem was that the shifting was not as smooth, in alternative if your are not pleased with the shifting performance, you can just get a RD-M7000-10, it's a 10 speed derailleur with capacity to clear a 43 tooth cog.

    Quote Originally Posted by Aglo View Post
    I agree with this, and just to mention that Shimano has a SLX M7000 10s rear derailleur.
    Link: https://bike.shimano.com/en-EU/produ...00-10-SGS.html
    No, this will not clear a 43 tooth cog. It has a total drivetrain capacity of 43T, but that's not what we're talking about here.

  24. #24
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    Quote Originally Posted by Jan View Post
    No, this will not clear a 43 tooth cog. It has a total drivetrain capacity of 43T, but that's not what we're talking about here.
    You are correct, thanks to pointing it out. Don't know how I got it wrong, I was sure I read somewhere when it was released that it would clear at least a 42t if not a 46t.
    Anyway, I edited my posts do remove that information.

  25. #25
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    Tooth capacity and largest cog size are two different constraints. The B screw or Goat Link only address the latter, not the former. The former is limited by cage length.
    Do the math.

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