Rear Cassette 10 Speed from 11-36 to 11-40

faceplant77
faceplant77 Posts: 25
in MTB workshop & tech
I do alot of hill climbing to get to work on my Calibre Bossnut V2, and saw a Cassette with 11-40T, would this make it a little easier climbing up the hills.
I have 20 gears 2 x 10, 22 x 36 on the front and 11.-36 on the rear.
By adding the 11-36 Cassett would I need to add extra chain links as I'm replacing the chain shortly due to wear.

Comments

  • JBA
    JBA Posts: 2,852
    Yes, if you change to a 11-40T cassette you will probably have to extend your chain.
    Search YouTube for tutorial videos. There are plenty on there. The largest sprocket - largest chainring and add 2 links method usually works for me.
    “Life has been unfaithful
    And it all promised so so much”

    Giant Trance 2 27.5 2016 ¦ Sonder Broken Road 2021¦ Giant Revolt Advanced 2 2019 ¦ Giant Toughtroad SLR 1 2019 ¦ Giant Anthem 3 2015 ¦ Specialized Myka Comp FSR 2009
  • reaperactual
    reaperactual Posts: 1,185
    edited September 2020
    Check your rear derailleur's max low sprocket capacity to be sure it has the range to accommodate a 40t low gear.
  • mully79
    mully79 Posts: 904
    Running a double on the front and wide range cassette is probably asking for trouble. Thats a big difference in chain length.
  • JBA
    JBA Posts: 2,852
    You’ll have no trouble running an 11-40T cassette with your chain set.
    My wife’s Giant Toughroad is equipped with an 11-42T cassette and 32/44 chain set as standard and it works just fine.
    “Life has been unfaithful
    And it all promised so so much”

    Giant Trance 2 27.5 2016 ¦ Sonder Broken Road 2021¦ Giant Revolt Advanced 2 2019 ¦ Giant Toughtroad SLR 1 2019 ¦ Giant Anthem 3 2015 ¦ Specialized Myka Comp FSR 2009
  • mully79
    mully79 Posts: 904
    36 + 40 = 76
    22 + 11 = 33
    76 - 33 = 43t derraileur capacity required.

    shimano deore shadow long cage has a capacity of 43t so it will be ok. The maths says its not as extreme as i thought !

    Still a bit too flappy chain for my liking !
  • reaperactual
    reaperactual Posts: 1,185
    edited September 2020
    .
  • faceplant77
    faceplant77 Posts: 25
    Thanks guys but just want to know how many links to add, is 2 or 3 enough?
  • JBA
    JBA Posts: 2,852
    You need to size the chain. Wrap the new chain around the largest sprocket and largest chainring, missing out the rear derailleur, and add two links.
    As I said in my previous post, search YouTube for tutorial videos.
    “Life has been unfaithful
    And it all promised so so much”

    Giant Trance 2 27.5 2016 ¦ Sonder Broken Road 2021¦ Giant Revolt Advanced 2 2019 ¦ Giant Toughtroad SLR 1 2019 ¦ Giant Anthem 3 2015 ¦ Specialized Myka Comp FSR 2009
  • steve_sordy
    steve_sordy Posts: 2,454
    Thread the chain as normal.
    Choose the biggest gear on the front and the biggest on the back.
    Adjust the chain length so that the mech arm is pointing forward at 45 degrees

    One last check, fully compress the rear suspension. If you cannot because the chain is too tight then lengthen the chain and check again. This step is important on a full suspension bike.

    The reason for the last check is that some bike geometry designs extend the rear centre and if the chain is not long enough to cope with this extra, you may suffer severe damage to the rear mech.

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