Giant Lafree problems

[tangent]

Hi Tony, I meant that the chain had been on for 3000 miles. The chainwheel has done about 18,000!

I am not impressed by the bike shop not spotting the missing roller though.

 

[flecc]

Oh, that's different then, amazing mileage!
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[tangent]

Bike is back together, but the chain is jumping on the rear sprocket even worse than it did before. I have not yet replaced the sprocket yet as it has has not arrived. Existing sprocket is well knackered though.

Is this likely to be the sprocket or insufficent/too much tension?

 

[flecc]

The sprocket almost certainly. A new chain runs badly even on slightly used sprockets, so it will jump on a badly worn one. Best not to run like that or it will damage the new chain.
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[tangent]

Will stay off it then until the sprocket arrives. Had to order by post as could not find a bike shop that stocked it. Hopefully get the chainring in the next few days as well.