richardmid1

Thanks. I'm looking at something like the Shimano M6000, SLX or XT. I love the hope stuff but it's much more pricey.

Do discs have the same power as hydraulic rim brakes on a 20" mod? I want to do away with having to grind/tar the rims and I like how silent discs are, just makes the ride look smoother and doesn't annoy anyone but I don't want to end up on my arse all the time!

Is it ok to use a standard mtb chain on a 20"?

Your headset is probably ok unless the bearings have crumbled into dust, which is unlikely. Your wheels are rim brake only so you will need rim brakes, Magura HS33 are what you want. Your forks can take a disc brake but you would need a new front wheel or just the hub (if you know how to build a wheel) to take a disc rotor. Your frame is rim brake only though. The wheels are 20" front and 19" rear so those are the tyre sizes you need. You want a fairly long steep stem for a 20" bike, maybe 150-180mm with 25-35 degree angle, the length will depend how tall you are, you can then play around with stem spacers and a riser bar to get the bike to fit you better. Hope this gets you started.

Tioga yellow kirin 2.3. 850g.

My god Hans Ray! That brings back memories!