Shortening the club length by 1.25" will lighten the swingweight by approximately 8 swingweight points. Assuming your current installed grip weights 50 grams installing the Golf Pride Tour 25 will give you back just over 6 swingweights. 4 grams of grip weight equals 1 swingweight.
Another issue here is shaft flex. When you shorten the club 1.25" and lighten it by 8 swingweight the shaft gets stiffer. 1 swingweight is equal to 1 cpm in a frequency machine used to measure shaft stiffness. Approximately 10 cpm's is a change of flex. So this shaft will now play almost a full flex stiffer then it did before. To get the shaft flex back to where it was before you would need to add 16 grams of weight to the clubhead. Shaft flex is controlled by length of shaft, either long or short, and shorter is stiffer and clubhead weight. You cannot change the shaft flex with a grip.
If you try this club with the lighter grip and it works, great. But if it does not work then I would suggest adding back at least some of the weight.
Date published: 2016-02-09