Any question answered...

Apparently the chainrings are 0.4mm closer together from 9s to 10s, and another 0.6mm from 10s to 11s, so your front indexing would be near enough if you use a 10s crank with 9s dérailleur, but the whole 1mm change from 9s to 11s will probably make it a PITA to set up without chain rub, especially as you're using a standard FD with compact rings.

Just tested fixie project and the chain is slipping with the cog. Is this fixed by just tightning it?

Cog is slipping, i.e. moving with relation to the hub to which it is attached?

If so, yes, tighten the cog (or sprocket as it is also known) onto the hub, then tighten the lock-ring down.

Although, if memory serves you have a freewheel?

More detail needed.

OK, if you don't fit the cog correctly you will strip the thread on your hub. I mistakingly thought the tighter the better and that's what happened to my first hub. Of course cheap parts are easier to bugger

Fit the cog to wrist tightness with a chainwhip, then ride on it gently with no backforce, i.e. so you tighten the cog to the max torque needed. Then put on the lockring wrist tight. You may need to tighten the lockring once or twice after this, as you apply a little more torque when riding properly.

I think that depends on the sprocket/hub.

With soft threads what you describe is a good idea, however it is also a recipe for having to carry a chainwhip and lockring tool with you to do it up again as it loosens off.

It would also be a disaster waiting to happen if riding brakless

If you were riding brakeless you should know what you're doing. I.e. fitting a cog on a decent hub with the correct torque from the off.

You'd also be riding on a track, no?

That aside, it's better to do it up properly before hitting the road.

It's very disconcerting when you go to resist the pedals and have that slipping feeling.

Anti-sieze on the threads, do it up "proper" tight, lockring on, then cycle up a steep hill, repeat tightening process (or rota-fix it if it is a beater) done.

Don't rota-fix it! You will fuck your threads!

Wrist tight, lockring tight, up a hill, repeat is fine.

As I said, beater only. And it's still a bodge really- hills are better.

Right- barbecue time!

Right- barbecue time!

Don't use lighter fluid

Bok bok bok

Where are all my socks?

Down the front of your trousers, if your avatar image is any guide.

I havnt fitted a freewheel. For the most part the bike is a beater but not the wheel set so i dont want to fuck it up. So yeh ill try do it up see if it works if not ill try a few other ways suggested.

I've got a rear wheel spaced to 126mm, and a new frame at 130mm.

Despite this the wheel seems to fit snugly, although I've not ridden it. Is it absolutely vital to have the frame coldset to shave off 2mm each side? If so, is SuperTed my best bet, or has anybody else had experience of doing it?

Down the front of your trousers, if your avatar image is any guide.

Front of trousers is full of cucumber, no space for socks.

Front of trousers is full of cucumber, no space for socks.

wrapped in tin foil?

the wheel seems to fit snugly

If it fits, it fits. I'd only ever get metal permanently deformed if there was a problem with dérailleur hanger alignment after springing a frame.

wrapped in tin foil?

Right. I'm tempted not to bother. Not ridden it yet, but it seems as secure as it would need to be to do so.

Reported for stalking.

if you're a home student can you stll apply as a international student to get a place then change the nezt year? or is this stupid.

Why are some ROADIES arseholes!!!
Today i was riding some country lanes slowly waiting for my mate to catch up (he had stopped) and a Road biker road up and said, "Is that a fixed wheel"
"Fixed gear Yer"
"you know thats completely illegal, your an idiot"
"You look like and idiot"
"Im calling the Police"
"what the F@$£ no its not"
So he stops i stop too he pulls his phone out of his lycra arse pouch
next thing i turn round up the road 1 mile later my friends front Tub has a puncture, Still got out alive though.
Sorry But i hate Road cyclists

whats your question sorry?