so over the past couple nights I've been rebuilding my bike and i've got a new chain as my old one was knackered
ive dropped off the cranks and chain rings and gave them a good scrub and re-fitted them then i measured the new chain against the old and cut it then refit
up on the workstand the drive drain ran sweet and true....quick pedal up the street and as soon as the pedal is under load the chain / chain rings are juddering and slipping (loud and nasty)
any ideas what this is? and how to solve it??
Sounds like your cassette is worn, potentially and/or chainrings but probably cassette.
i did wonder about that but the previous chain ran just fine
and ive double checked that its the same style of chain
The chain and cassette/rings wear together, if your chain was completely knackered then the rest will be too. Have you still got the old chain?
yeah ive still got it
Well you could sling it back on and then replace the lot when it's unusable, or try replacing the cassette and see if you can get away with out changing chainrings. Does it slip worst when in the small sprockets at the back? Obviously depends on usage but less teeth means they wear faster.
actually yeah i did notice that, the smaller cogs at the back slip almost every 2nd revolution