CAAD Beater: Single Speed to Geared

Intended to be a reliable/nippy commuter, I purchased this a month or so back:

https://www.lfgss.com/conversations/354698/

I’m now in a position where I barely need a commuter, but could do with a bike to hook up to my trainer for indoor training (would rather not use my TT/“best” road bike on it). I know the easiest solution would be to flog this, and sort a cheap geared replacement, but how easy would it be to re-convert back to how it used to be?

Thinking out loud, I’d need:

• New BB
  
• FD/RD
  
• Shifters
  
• Cassette (+different rear wheel hub?)
  
• Maybe chainset (although on ERG mode the current one should suffice, and also preclude the need for an FD)
  
  

Any help/guidance appreciated. I’m essentially trying to work out if it will be cheap and straightforward enough (my skills/tools are limited) to make it worthwhile.

Thanks,

Lewis

Be helpful to know what type of trainer as a start..

It’s an Elite Direto X direct drive trainer.

If you are using ERG then you don't need to change gear, so you could just buy a cheap chain tensioner and run it single speed on the trainer. Probably need a cheap chain that matches the cassette on the trainer.

If you want it geared to run outside etc then yes you could get cheap parts from that list above on here and bodge something together, not really necessary for indoor training though.

Thanks mate, hadn’t considered it being possible as the bike stands but that could be a cracking shout (at least for now).