The man who died is thought to be in his early 50s.
The other man, reportedly in his 20s, suffered spinal and leg injuries and was taken to Addenbrooke's Hospital in Cambridge.
An investigation into the accident is underway.
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Any showers will die away during the evening, leaving a dry night with some clear periods.
Scattered showers around at first this evening will soon move away, as dry and clearer conditions arrive from the northwest.
This is the first picture of a dad killed in a bike crash, almost 17 years after his two brothers died in another road tragedy.