Bells have sounded from the tower since at least 1658 when a ring of six were installed, cast by Bryan Eldridge of Chertsey in Surrey. Over the centuries four of the original six have been re-cast or replaced.

The treble, second and fourth bells were re-cast on the dates shown in the table. All the bells except the old No3 were re-hung in a new bell frame in 2000. This bell remains in the original bell frame and was replaced by a newly cast bell at that time.

The tenor bell has an interesting history. It was original believed that it was cast by Robert Taylor at his foundry in St.Neots in 1787. A study of its history undertaken by Chris Pickford* revealed that it was more likely cast by Islip Edmunds of London for the church at Bletsoe in Bedfordhsire . Edmunds was Robert Taylor's foreman and so he would be familiar with the St.Neots foundry. This bell was returned to the foundry in St.Neots by the church authorities at Bletsoe as part of a re-casting scheme to make a lighter ring. It would appear that the tenor bell at Great Gransden was also in the foundry to be re-cast and was simply exchanged for the Edmunds’ bell. R TAYLOR FECIT is incised on the bell and the original inscription defaced but enough remains to almost certainly identify the bell’s origin.