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Installing The Cassette

As with all things mechanical or electronic, the first step toward a satisfying experience is preparation: be prepared to believe that the documentation is incorrect, or incomplete. This goal of this article is to help you avoid frustration when installing your cassette.

History of Neo Freehubs

The original Neo came with an Edco freehub to accommodate cassettes from Shimano / SRAM and Campagnolo. In 2018, the Neo (and Neo 2) began shipping with a Shimano freehub, as Edco has ceased production of the freehub and the future of the company is uncertain.

In 2018 and beyond, there are now two additional freehubs available for separate purchase:  a Campagnolo freehub, and a SRAM XD freehub for XD 11 and 12 speed cassettes.

Pro Tip:

With some cassettes, you may need to install some cogs individually on the freehub. It is possible to install the cog backward, which will result in a skipping chain on the backward cog.

Regardless of manufacturer, each cog has an embossed stamp with the number of teeth for that cog. Just remember — the stamp should always face toward you, not toward the Neo. When in doubt, look for the stamp!

Neo / Neo 2 with Shimano Freehub (2018 – )

11 speed

You will not need any additional spacers. Simply install the cassette in the proper order and orientation.

10 speed

No matter what, you are going to need at least the 1mm spacer that came with your Shimano hub Neo, or Neo 2. Install the spacer on the freehub according to the documentation.

Official Tacx cassette installation documentation – Step 3

However, you may not be completely through. Some Shimano cassettes will require an additional 1mm spacer. Those cassettes are Dura-Ace, Ultegra, and 105.

If you aren’t sure what kind of cassette you have, examine the back of your largest cogs. If they are perfectly flat and level with no indentation anywhere, then you should be able to install your cassette. See photo below for examples if you’re uncertain.

Left: Shimano Ultegra 6700 with recess
Right: Shimano Tiagra without recess

If your cassette has any indentation or recess at all, then you will ALSO need to install the spacer that came with your cassette. Unfortunately, this step is omitted in the documentation, and has led some Neo 2 owners to become frustrated while trying to install their cassettes.

See the video below for a more detailed discussion about the recess, and why you need the additional spacer. 

Explaining the need for an additional spacer, which unfortunately is not mentioned in the official Tacx installation documentation. No worries – we got you!
12 speed

12-speed cassettes for offroad bicycles can be used if the cassettes are made for a Shimano HG11 freehub, but not SRAM XD freehub or the newer Micro Spline freehub. SRAM NX Eagle XG-1230 11-50 and SunRace MTB CSMZ90 11-50 will both fit Neo.

A monster NX Eagle 11-50 cassette on a Tacx Neo with Shimano freehub

Neo 2 with Campagnolo Freehub (Separate Purchase Required)

(Coming soon – we don’t actually have one to demo for you!)

Neo / Neo 2 with SRAM XD Freehub (2018 -)

(This is literally so new we can’t even get one yet. Coming soon!)

Neo with Edco Freehub (2015 – 2017)


The Edco freehub is compatible with all Shimano and SRAM cassettes from 8 to 11 speed. Campagnolo cassettes are also compatible with exceptions of Centaur 9,10 and 11 speed (2009-2011) and Veloce 10 speed.

The Edco Nightmare

While the goal of shipping the Edco hub was to improve compatibility between Shimano and Campagnolo owners, the result was a freehub that underperformed, and frequently caused problems for Neo owners.

If you are just getting started with Neo, and have an Edco freehub, I strongly urge you to consider switching to the Tacx Shimano (part number S0012) or Tacx Campagnolo (part number T2805.51) dedicated hubs that shipped with Neo in 2018. It is a better quality hub with far fewer issues, and you will be saving yourself a headache.

Click here for Shimano freehub body.

Click here for Campagnolo or SRAM SD freehub body

Shimano Instructions

11 Speed

If you’re using an 11 speed Shimano / SRAM cassette with your Edco freehub, you do not need any spacers on the freehub itself. Place the cogs in the proper order and orientation, and you’re mostly done.

10 Speed

If you use a Shimano / SRAM 10-speed cassette with your Edco hub, you will need to install at least one additional spacer, and possibly two. Without hesitation, you can safely place the first spacer (black in color, plastic in feel) on the Edco freehub.

If you are in any doubt about which spacer you have, the best thing you can do is measure it with a caliper. If you don’t have a caliper, use a ruler or a measuring tape.

Now we get into one of the most confounding pieces of component documentation in the history of assembly: the cassette pocket.

What on earth is this referring to?

The “pocket” is basically referring to any recess on the back side of the cassette. If the cassette is not perfectly flat and free of any kind of divot or impression, you will need an additional spacer. You need the extra spacer because without it, the lockring will bottom out on the freehub before the cassette is completely tight, and your cogs will be loose and rattle.

The easiest, clearest way for me to explain the “pocket” is this: Dura-Ace, Ultegra, and 105 ten-speed cassettes all have the recess on the back of the cassette. If you have one of those, then you need the extra 1mm spacer that comes with the cassette as well.

12 Speed

12-speed cassettes for offroad bicycles can be used if the cassettes are made for a Shimano HG11 freehub, but not SRAM XD freehub or the newer Micro Spline freehub. SRAM NX Eagle XG-1230 11-50 and SunRace MTB CSMZ90 11-50 will both fit Neo.

Campagnolo Instructions

11 Speed

First, install the dark-colored .5mm spacer on the freehub. Then install the cassette in the proper order and orientation.

10 Speed

You will not need to install any spacers on the freehub. Simply install the cassette in the proper order and orientation.

Lockring Installation

Finally, you will need to install the cassette locking.

Edco Lockring Installation

The Edco freehub ships with two different lockrings: an 11T lockring, and a 12T lockring. It is important that you install the lockring that corresponds to the number of teeth on the smallest cog of your cassette. Failure to use the proper lockring will result in terrible rattling in the smaller cogs. If you aren’t sure which you have, count the teeth on the cog, or check the stamp on the cog itself.

The Edco lockring is compatible with the Campagnolo lockring tool. While the Shimano lockring tool will technically fit, it’s loose and not the appropriate tool for the job.

Other Lockring Installation

Whether you’re using the Shimano, Campagnolo, or SRAM XD freehub, use the lockring that came with your cassette, and the appropriate lockring tool for the type of cassette you have.

Make sure the lockring is on straight so you don’t damage the threads. Finally, use your torque wrench and chain whip to tighten your cassette to 40 Newton meters, and your cassette installation is complete.

Tightening the lockring with torque wrench and chain whip

TF wishes to thank Pål Kristoffer Sørvoll for his content contribution for this article.

Updated on December 19, 2018

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  1. Hi I have a Neo 2 (32318) it came with a multi hub I have had a Campag 10 speed Veloce on there since I purchased. I bought a new 10 speed Campag Veloce and it has 8 sprockets in the centre where toehold one had 4.
    The new Veloce does not fit, I looked at the purchase of New hubs and you have one for the newer Neo 2T but the older one is not available for purchase.
    What do I do from here ?

    Thanks Des

  2. Hi…
    For tacx neo 2….
    I have tiagra cassette 10v cs-hg500 11-34..
    How many 1mm spacers must i install?
    One or two?

  3. Hi, I was removing an old Shimano cassette to replace with a new Ultegra but when I removed the old one the Shimano Freehub came off with it, is it just a case of sliding that back in and tightening it or will I have to buy a new Shimano Freehub ?

    1. Sounds like you removed the axle nut instead of the cassette lockring. No matter what, you need to put the freehub back on because you won’t be able to remove the lockring otherwise. It would be impossible to do while holding it in your hands.

  4. On the Neo 2T smart trainer: which hub fits the SRAM XG 1150 10-42T 11SPD Cassette? I tried what was recommended (Tacx body T2875.76) and it’s not letting the cassette seat fully. Please help. Thanks, Casey

    1. After some help from Garmin support, all I really needed to do was to tighten it down with the cassette tool. The cassette and hub body do not actually ‘seat’ together as I had envisioned, prior to tightening with a cassette tool. Hopefully this will help someone in the future.

      1. Casey, having exactly the same components as you, did you use a spacer? I’m also having some issues to get this cassette installed correctly.

      2. Hi Casey, I have the same components as you and also having some troubles installing this cassette. Did you use a spacer? Also, any indication on how much force you have to apply using the cassette tool?

        Thanks, David

  5. What Hub will fit my SRAM XD Cassette? The Cassette is a SRAM XG 1150 10-42T 11SPD? It states on the cassette that it’s XD Compatible only.

    I ordered the Tacx hub T2875.76 hub, and it’s definitely not working. The hub won’t let the cassette seat fully.

    Please help.

      1. For the SunRace, 8-speed, 11-32t cassette, or any 8-speed cassette, do you only need the 1mm (T2805.16) spacer? or are more spacers needed?

          1. Thank you Drew!

            You answered my question here when I went looking through the old posts. Same as others with an old Trek 1200, 8 speed. Now I will throw it on the Neo 2T with the spacer & will upgrade to a new bike at a later date.

  6. Hello,

    I installed on my new Neo 2T the sunrace MZ90 11-50 cassette. According to the manual without any spacer. Now the problem is, the on the biggest (50) there will be no space for the chain between the cassette and the trainer. If I install the included spacer from the trainer, I got enough space for the chain – but the derailleur will clash to the housing of the trainer.
    Is it possible to install another spacer or what I’m doing wrong?

    Best regards Stephan

    1. Hi Stephan. All cassettes have the same inner spacing because otherwise they would get caught in the spokes of your wheel. The hub that is on the Neo is the same concept as a standard bicycle freehub, but with pawls to fit the Neo flywheel. There is no way that your chain is hitting the Neo disc. Physically not possible.

      If you have already installed the spacers behind the freehub as in the assembly manual, then there should be plenty of room. If your rear derailleur is still hitting the Neo housing, then the likely case is that your derailleur hanger is bent.

      1. Thanks for your answer. my derailleur is definitely not bent, because I wrote my bike yesterday in my normal configuration 1×12 XX1 Eagle on a xd freehub.

        Is it possible to add pictures in here? So I can show the problem with the cassette.

  7. HI there, I need some help!

    I’ve just dug out a brand new Tacx Neo which I bought back in 2016 and never used. It has the Edco freehub on it.

    I’m installing a Shimano CS-HG41 8-speed cassette 11 – 34T.
    IN the documentation above, you mention “The Edco freehub is compatible with all Shimano and SRAM cassettes from 8 to 11 speed”

    However, the 8 speed Shimano Acera cassette that I bought to match the Shimano Claris groupset on the bike, has 2 “rivets” on the nearside section of the cassette which mates to the hub. However, there are 3 actual holes.
    You can see this here:

    As a result, the cassette rotates in an uneven fashion. What’s the fix here? Is it simply that the cassette just does not function with the Tacx?

    1. Hi Stuart. Sorry for the very late reply. I don’t know how I missed your post. The answer to your question is a notched spacer that has divots for these types of cassettes.

      1. Drew, can you elaborate further? I’m trying to determine what I need to buy for the same setup.

        1. Hi Daniel,

          Sure. On some cassettes, there are rivets. Some have two, some have three. On more expensive cassettes, the pins are much further out, so you don’t run into this problem because the cogs are narrower to cut down on weight. So, in order to use one of these cassettes, you need a 1.85mm spacer, but it needs to have space for the rivets. They look like this:

          spacer with divots

  8. Hi there, i have a Neo 2 on its way and run 11 speed shimano for my wives bike and 11 speed campag for my bike can i use a shimano cassette only for both thx

  9. I just change the original freehub from edco to a new only shimano one from tacx, and now is working perfectly. Before i always have problems of indexing….

    SHIMANO/SRAM Freehub (Type 1)

    this website is great!!!!!!

  10. Hi,
    For the Neo 2T and a Shimano CS-HG500 10 speed cassette, how many spacers and what size?

    1. I just put on my old Shimano Ultegra cassette and needed two 1 mm spacers.
      One spacer came with the Neo and one i’ve saved from when I bought the casette many years ago.
      It solved my issue directly after ours of testing other things. 2 spacers was the trick!

  11. Hi guys,

    Just got neo 2 and installed Shimano 11 speed – 105 cassette. Having issues of gears missing / jumping. I’ve added 1mm spacer but this hasn’t doing anything. It’s still jumping. Any suggestions>

    1. Sounds like you installed a new cassette and are using it with your old chain. That is a no no.

  12. Hi, I have an issue to install eagle NX PG-1230 12 speed cassette to Neo 2T. When installed by following the instruction, I found that the derailleur are touching the trainer while in biggest gear, so I follow the instruction and added two spacers in the driver side axis.

    After done that, the touching issue has been fixed, however, I found out when in smallest gear, the derailleur cage is not align with the smallest gear in the cog, the derailleur is too outside and tend to drag chain out of cog. And if I try to shift Up at this time, the derailleur moved into the wheel but the chain refused to shift, since the cage is not align with the second gear in cassette (cage is align between two gears) .

    Then I compared my bike with neo 2t to see what the difference, and I found out that driver side quick release adapter in my bike is much short than the one in neo 2t. basically, the NEO 2T driver side adapter (QR 130 NS) is too long and force the rear fork far away from cassette, and since the derailleur cage is attached to rear fork, it makes cage not able to align with the wheel.

    One solution I’ve think it to get a short driver side quick release adapter so that to make fork(and derailleur cage) to closer to the cassette, so make them align with each other, however, I don’t see Tacx sell such parts, there seems only 1 type of 5mm driver side quick release adapter available on tacx.

    Any suggestion on that? Thanks!

    1. You don’t need a shorter driver. The threaded portion of the provided skewer will accommodate a 130mm axle. You just have to keep turning it, meaning that some portion of the threaded end will protrude beyond the axle nut. This is expected and normal, as this skewer is used for both 130 and 135mm dropouts.

      Threaded portion protrudes for 130mm frames

      1. Hi Drew,

        Thanks for you reply.My bike is 135mm bike and I think I may not explain well, but I am talking about the Driver Side Adapter, not the skewer, the skew is good, it used to secure the outbound of the rear fork, but the problem is the inner gap is too long, where is it determined by the Driver side Adapter .

        this Driver Side Adapter ( printed QR 130 DS, QR 130 DS) that pre-intalled in Neo 2T, the adapter has two width and screwed into the hollow shaft of the trainer and sit between between the cassette and the skewer cap. this adapter has two width, and rear fork is landed on thinner width of this adapter which is toward outward.

        Therefore, there is a gap between the smallest gear in cassette and the fork, and the gap size is determined by the thicker part of this driver side adapter (not determined by the quick screwer cap). The problem is the gap is too wide, so the derailleur (that aligned with the fork) is no longer align with the smallest gear and is trying to pull the chain out of the gears and make it stuck into the gap.

        I compare the gap between my rear wheel and neo 2t, and found the neo 2t has a much larger gap and that’s why it has this problem. so if the drive side adapter has a short width, (the thicker part of adapter is shorter), then It could be looks like exactly like my rear wheel to make it works.

        I wish i can upload a picture so you know what I mean if i have some address I can send to.

        Thank you!

        1. I understand I can use the shifter’s barrel adjuster to re-adjust the derailleur’s to make it alignment with the smallest gear while bike is attached to Neo 2T ,but by doing it. I need to re-adjust the shifter every time when i switch between the trainer and the wheel. I wish I could avoid it by having a shorter driver side adapter so that I don’t need to make this shifter adjustment every-time when switch. Thanks

          1. I am having exactly the same issue. Did you found an answer already? The gap on my tacx is almost 5mm and on my bike maybe 1mm or 2mm.

  13. Hello

    I have recently acquired a TacX Neo. My cassette was too loose and, so despite it stating above that I should not need the provided spacer which goes on ahead of the cassette (an 11-speed Shimano 105, 11-30). I have had to use this. Is this wrong?
    I also have a thru axl bike and bought a 135x10mm Thru Axl Adapter from TacX. Is this size suitable for all bikes? I’ve spent too long trying to get it all to work and still no success.

  14. Hi,
    On my new NEO 2T, I have installed an 11-speed Shimano 105 cassette.
    On my roadbikes, I have the same cassette on one of the bikes, and an Ulterga 11-speed on the other.

    Initially, when using the lowest gear, I noticed that the derailer touches the wheel (not all the time, only when pedaling, and when the bike slightly bends to the side). So I added the 2 spacers that are supposed to be put behind the freehub and behind tha black ring. But I noticed noise with some of the gears. So I tried removing one of the rings (the 1mm ring), the problem improved slightly but remained. So, I tried removing the 0.5mm ring and put the 1mm back in, and things have improved.
    But I’m wondering if I am doing the right things as when mounting the freehub I noticed that the dents remain slightly outside (logical with spacers put behind it).

    Anyone has had the same problem?

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