Chain Slipping - Crankset

[raleighnut]

If it's a double ring then just take out most of the cable slack when the chain is on the inner (and the inner is selected) then try shifting up,it may also be the top limit screw has rattled down a bit (I've known that happen) but tension is my bet.

 

[nickyboy]

645 miles and you think you need a crank ring? Nah, not in that short mileage. There's some other reason.

Wot he said. I've got a Btwin 720, not the same as yours but I suspect not a million miles different in terms of spec. I've done about 15,000 miles and the front rings are fine. Zero possibility of excessive wear in a few hundred miles. Surprised about replacing the chain too so quickly. With a bit of TLC mine do about 3,000 miles and they're inexpensive KMCs

 

[dhd.evans]

It was cable tension and the limits had gone out too. God knows.

Cheers all!