The Good Old Squeaky Noise Problem!

Quoted post said:

Originally Posted by Corby2014

queak occurs on the following:

Big Chainring only, rear cassette 1-4
Back pedalling with above scenario.
Above 18mph.

In short, it only happens when you're moderately to acutely cross-chaining from the big ring, and moving faster than 18 mph. And it only happens when the chain is turning, either forwards or backwards.

Have you cleaned and lubed your chain lately? And while you're looking at it, look for a stiff or bent link.

Front derailleur rub?
Seat rail squeaking when rocking in the saddle?
Rear derailleur pulley bushing/bearing need greased/oiled?

Thanks for the responses, I presumed that everything would have been greased up and tightened during the top end service I paid for last week....not so! I oiled the chain and torqued up some bolts on the chainring etc before my ride today, the ride was done in the big chainring at a 19.5mph avg, no squeaking. Looks like the bike mech forgot to do some bits!