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Can anyone help?
I have had a new derailleur fitted on my Merida 93 road bike by Ross in caterham on the hill with a new chain and cassette. Despite three visits to Ross the chain slips on the rear cogs when putting pressure on chain. Each time I visit Ross there is an improvement and slipping reduces but it has yet again slipped whilst going up Waller lane Caterham and bencombe Road Purley. Ross has suggested changing to better cables.
Slipping now only occurs on small ring at front and easiest cogs at back.
Chain is correct for 9 speed Tiagra derailleur.
Any suggestions before I go to Ross yet again?
many thanks.
Best
Francis