New project - bike renovation (beginner!)

in Workshop
Hi all.
Ok here it goes.....
I've been riding for just a few months, bought a nice 2nd hand Pinnacle Dolomite that's in great nick. Trained indoors on a new trainer initially, then ventured outside last couple of months - love them both.
No bike background but have managed to do a few things like replace stem, handlebar adjustments, replaced cassette on trainer etc, just very basic.
Anyway, my two teenagers looking to get into it, so have bought a very cheap, very old Trek 1000sl that needs a bit of work. So it's going to be a bit of a project for me as quite fancy getting into some self learned maintenence. Going to be a labour of love (or hate!). Fortunately the boys aren't in a rush, and I certainly won't let them out on it until I'm totally happy and tested it myself.
Shimano tiagra groupset (how to tell exact model?) with Shimao Sora flight deck triple shifters (ST 3304).
Rear gear cable is frayed. Front gears really stiff on the shifter and misses on some of the changes. Brakes seem OK. Going to give the chain and cassette a proper dismantle and clean.
Long term I might buy new cassette and chain and might even strip it down to frame and sand and prime and respray, if I'm brave enough, but need to get it in working order first.
First job is to replace the gear cables and I might as well to the brake cables too for piece of mind. Never done anything like that before!
I'm happy to learn on the job, can see loads of videos etc, but first off how to I tell which gear cables I need, or are any shimano cables suitable?
Is it also worth taking off the front and rear gear derailleur mechs too and giving them a good clean at the same time?
I'm sure I'm going to have lots of questions so any help is much appreciated! Hopefully take pictures as I go as a bit of a blog on my project....🤦
Ok here it goes.....
I've been riding for just a few months, bought a nice 2nd hand Pinnacle Dolomite that's in great nick. Trained indoors on a new trainer initially, then ventured outside last couple of months - love them both.
No bike background but have managed to do a few things like replace stem, handlebar adjustments, replaced cassette on trainer etc, just very basic.
Anyway, my two teenagers looking to get into it, so have bought a very cheap, very old Trek 1000sl that needs a bit of work. So it's going to be a bit of a project for me as quite fancy getting into some self learned maintenence. Going to be a labour of love (or hate!). Fortunately the boys aren't in a rush, and I certainly won't let them out on it until I'm totally happy and tested it myself.
Shimano tiagra groupset (how to tell exact model?) with Shimao Sora flight deck triple shifters (ST 3304).
Rear gear cable is frayed. Front gears really stiff on the shifter and misses on some of the changes. Brakes seem OK. Going to give the chain and cassette a proper dismantle and clean.
Long term I might buy new cassette and chain and might even strip it down to frame and sand and prime and respray, if I'm brave enough, but need to get it in working order first.
First job is to replace the gear cables and I might as well to the brake cables too for piece of mind. Never done anything like that before!
I'm happy to learn on the job, can see loads of videos etc, but first off how to I tell which gear cables I need, or are any shimano cables suitable?
Is it also worth taking off the front and rear gear derailleur mechs too and giving them a good clean at the same time?
I'm sure I'm going to have lots of questions so any help is much appreciated! Hopefully take pictures as I go as a bit of a blog on my project....🤦
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You can download the Shimano technical documents for yor bikes components here https://si.shimano.com/#/ you will have to search for the archived pdf documents. Select the by Series box, then Road from the drop down menu, Sora from the next drop down menu, select the 3300 box to see the list of relevant pdf files.
Worth regards to gear cables, most things I've seen online come in packs for outer , inner and ferrules? As long as they contain the size and type you mention for each component I'll be good?
"Worth regards to gear cables, most things I've seen online come in packs for outer , inner and ferrules? As long as they contain the size and type you mention for each component I'll be good?"
Yes, like this https://www.merlincycles.com/shimano-road-gear-cable-set-stainless-54000.html other brands are available.
ask for ferrules and cable ends as well.
Remove all old cables one at a time and cut outers to the same length as the ones you have taken off - you know these are the right length.
Also means you can follow the routing for each cable.
When removing gear cable make sure its in the smallest cog on the cassette and chainring as you need to be able to do this to feed the cable in and out of the shifter.
Q1 - currently I've stripped the cassette and chain of for cleaning. Can I fit the gear cables without the cassette&chain on? I.e just make sure the shifters are set to the correct gear (sound like put them in whatever gear for what would be the smallest cogs) and go?
Q2 - looks like the jockey wheels might need replacing they look a bit worn. I can't seem to find the exact model of the tiagra derailleur but few Google searches suggest most shimano jockey wheels would suffice. The ones one the bike are 10 teeth, so I think any 10 teeth shimano ones would suit?. Lots in ebay or one like these - https://www.sprocketandgear.co.uk/products/shimano-jockey-wheels-pulley-set-10t-7-8-speed-ty05?variant=32787551060101&utm_medium=cpc&utm_source=google&utm_campaign=Google Shopping&utm_campaign=gs-2020-03-16&utm_source=google&utm_medium=smart_campaign&gclid=CjwKCAiAgJWABhArEiwAmNVTB_-RNNWop47hqJyM5NYQMHIltqNGp8yfNDlQkOfimJbWLKm-CKS2cRoC0CwQAvD_BwE
?
Thanks all!
Edit, actually they jockey wheels are 11 teeth! So need matching shimano 11 teeth jockey wheels?
Q2 fit the jockey wheels appropriate to your drive train speed. i.e. buy some listed as for 8 speed. dont over think it.