just had a service and had a new chain fitted.
went out last night,and the when changing gear into the three smallest chainrings on the rear ,the chain started slipping.
its 9 speed at the rear(3 at the front)and its fine in the 6 larger ones,but no matter what im in the front it still slips.
i cant take it back until monday,but i want to get out with the lads tomorrow.
any help woukd be appreciated?
thanks

Sounds like the cassette is worn. Should have been changed with the chain if that bad.

wondered about that,but it was ok before

could be that the indexing is out but wear seems likely as well

wondered about that,but it was ok before

Chain and cassette wear together. Fine until you replace one or t’other. New cassette needed. Poor form by shop who serviced.