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I need to replace these things, and I'm sick of the exorbitant prices charged for labour in central london shops, so I'm going to do it myself...

1. The cassette is a Shimano HG81 11-36 10-speed. If I wanted to get something other than Shimano online, how would I know if it's compatible? Or am I better off sticking with the exact same cassette?

2. The crankset is Shimano XT, but I have no idea exactly what model it is (pic http://imgur.com/d5cOL6n) ... As above, if I wanted to replace just the middle and inner chain ring, how can I tell what's compatible?

Thanks in advance for any advice for this poor n00b....

So long as it is ten speed and shimano it willbe fine.

as for chain rings try to stick with shimano if you are running a double or a triple and look for ten speed. the cheapest ones ie deore are fine and hard wearing unless you are doing silly miles.

replace chain at the same time otherwise it will probably slip, again get a shimano again to be safe and make sure it is 10 speed

Pretty much what tugger says,
Definately change the chain aswell if your changing cassette and chainrings.

One thing though, have you got the correct tools to change all the bits? You need a chain whip and cassette removal tool and possibly a crank extractor depending on what cranks you have.

Cheers tugger I've got a Shimano HG-X 10 speed chain ready to go, but I've read (as you also said) that I should replace the chain at the same time as the cassette and rings...

I'm looking at this 32T chain ring (http://j.mp/18aM8UG), but whilst it says 9-speed compatible, it doesn't say anything about 10-speed... I'm not sure if it's just assumed that it is 10-speed, but also works for 9-speed?

This DIY workshop is not far from where I live http://lbk.org.uk/ ... based on previous experience with the cost of repairs in store, I think this will work out much cheaper - and I'll learn some new tricks along the way

No. has to be ten speed. chain is a different width from a ten to 9 speed. so wont work

its all a massive ball ache!

you're not wrong mate! But it's kind of fun working it all out... i guess in this case I'm probably better off taking my bike to the shop so they can be sure they're selling me the right one...

Whereabouts are you? Sure we can point you in the direction of a decent shop

I'm in shoreditch. there's a cyclesurgery and evans in spitalfields, but if you have any other suggestions I'm all, er, eyes...

Stick with 10 speed, the only decision is triple or double up front, if you go double you'll need to fettel your front derailluer a little, pretty much every part you want to change unbolts, just make sure you do everything back up snug. Don't wrench on it

Sent from my GT-I9100 using Tapatalk 4

If you mean don't over-tighten the bolts, advice is noted!

The LBK is a good spot. I like these guys though:
http://www.micycle.org.uk/

a one-off £5 membership fee gets you access to their workroom/tools etc if it's not full, and to their knowledge if you ask nicely. nice dudes too - take time to explain things.

I reckon either head does a shop like that, or spend the £50 on tools and learn to do it yourself through watching videos, reading webpages etc - the tools help you clean your bike too.

Hi all,
Just got back to work so back on line.
Just spent 4 days riping my Camber to bits..........
Changed the bearings alround except for the one near to the bb .
Got the right bb to fit -wrong crank (cheap - wrong size ) sent back to Chain react. order the right part five pounds extra .
Problem is cannot get the crank of . broke the tool smashed the crank to bits bashing it.
How do you get a octolink crank off . is there a secret screw .method or just use a 30lb hammer.
.Got to do it now as to get to the bearings (3 ) near it.
Sprayed it with releasing fluid.
Had to buy new bolts as well as had to drill one bolt of.
150 quid spent -new I should have bought my 14th bike.
Getting close to taking the bits ..... to a shop and asking them to get it off.

HELP.

Bob

Octalink cranks require the correct puller. It jas a slightly wider head than a normal puller. If you were closer you could borrow mine. You won't get the cranks off without one.

Hi,
Thanks where are you.
I could get it do it and be away .
my mobile nr is 07761373665.
Text me .. I ring you back.

It is like modern cars they make it more complicated every year.

I am waiting for parts at the moment.
I want to get it running so I can go for the secret bunker blast.

Thanks again .
Bob