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my GF's bike has biopace rings and they're horrible, feeling 'choppy' (stupid description, but the uneven feel when pedalling is best summed up this way) though the pedal stroke. Bizarrely she doesn't notice it, but to me they're weird and of no real benefit.
might be obvious but check the little notch on the inside of the chainring is installed so it's hidden by the crank.
got a biopace triple and when i got it i didn't notice the little ring was rotated round so the extra 'push' was at the wrong part of the pedal stroke and it felt really odd, like you described.
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nuknow- As in what kind of NB 1500...
Thank you adoubletap.
the ones in the first pic are solebox toothpaste pack.
the second ones are similar but not quite the same.
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may i suggest a slight detour.
http://www.gmap-pedometer.com/?r=5124684
makes use of the last hill before cambridge and has a nice 2 mile straight to spin down. plus you get to ride past a windmill.
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tape looks like this
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not any more. left a while ago and they've since started the do lectures