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At present, I own Specialized Allez e5 Sport which has the default Shimano Sora cassette (11-32t) and rear derailleur.

I'm planning to buy Wahoo KICKR (for long-term, given more bike(s) will come), so my doubt is that is my current bike even compatible with the trainer, given that Wahoo does provide the 1.8mm spacer.

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    Your local bike store or many online stores will have spacers in different sizes available if your cassette that you might want to use doesn't fit. But it will. 8-/ 9- and 10-speed Shimano cassettes require a 1.8mm spacer on an 11-speed hub, whereas the 11-speed fits without. So don't worry about upward compatibility. – Carel Sep 27 '18 at 11:26
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Your bike should be compatible per wahoo: "The KICKR uses an 11-speed compatible Shimano freehub body, but you can install an 8, 9, or 10 speed cassette with the proper spacers."

https://support.wahoofitness.com/hc/en-us/articles/204281874-Difference-between-10-speed-and-11-speed-KICKRs-

You should be fine installing the 1.8mm spacer on the kickr along with a 9-speed Shimano cassette. The same spacer is needed for installing 10-speed Shimano cassettes. Just make sure there is no play in the cassette after installing, if there is, you should be able to get different sized spacers from any bike shop as needed.

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    Ok, the trainer will arrive in the next 20 days or so. Will update you, how it fitted. – harmands Sep 27 '18 at 18:45
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    I got my Kickr yesterday and it did fit perfectly on my 9 speed SORA cassette with the 1.8mm spacer provided along with it. – harmands Oct 31 '18 at 8:30
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    Great @harman786! Good to hear it’s working well! – Benzo Nov 1 '18 at 11:30

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