chainrings.

i just replaced my chain and cassette…but now my middle chainring slips…do i need to get new chainrings? or will it wear in?…if i replace them should i replace both middle and little rings? (dont have a big one…thats a bash gaurd)

Why did you replace your chain and cassette?

Like demonic possession I find that problems don't get solved they just move from one part of the bike to another.

… they were worn out…and i snapped the chain to many times to let it fit on the bike….

Blimey you let things get 'worn out' …..run away fast

i like to think of it as not wasting cash…i use brake pads untill its metal on metal…

Have you tried it on the granny on anything steep? Probably messed up too.

Sadly you have to buy some new ones, the plus is you can get some cheapy steel ones and you wont notice the few extra grams.

If you try and let them wear in to the new chain, it will be the new chain getting knackered and not them getting better unless your bikes called Christine.

yeah found a new middle ring hanging around…i think i might be ok…gonna see if i can find a new granny too

If you're going to wait until everything wears out, then you'll need to replace everything at once, else the new stuff will have to wear (out) to the same degree as the most worn out component for it to engage properly

If you keep track of the stretch (get one of those little chain stretch things) then you can replace the chain at about 0.75% stretch. When I've done this the new chain has gone on without slipping. Granted you won't be able to do it forever as the drivetrain is going to wear, but it will save you money in the long run. At 1% Stretch its taken me about 2 rides for the chain to stop slipping

Another way (thats probably the best value for money) is to rotate a set of chains. Something like 3 chains and keep swapping them on a set rotation every couple of rides. Not only will you lilkely clean your chain more often (as the chain is already off (its easier if you use powerlinks, even if using a shimano chain)) but you have a casette, 3 chains and chainrings all about at the same level of wear right from 0% stretch through to worn out
It just depends if you think you can be bothered enough to keep swapping them over

james has it sussed – exactly what i do

paul

i have thought about using three chains at once before…im running a KMC chain atm…and u can buy packs of three quite easily

buy a little chain wear indicator. £5 off CRC, it's just a bit of metal with 2 edges – one side indicates 0.75% wear (change chain to keep on top of drivetrain wear), the other side indicates 1% wear (deffo time to change chain otherwise drivetrain will be fooooooked). one of my fave tools – saves a lot of money in worn out drivetrains 🙂