A full fitter can swap for the lighter shafts, and if necessary, use a lighter weight in the head (they should have the full set of weights for fittings). Nothing will be as light at the TSi-1. On the recent call with the Titleist TSi team, Stephanie kept pushing that there is a balance between mass and head speed. A fitting should give you an answer as to which gives you the best feel, distance, and dispersion pattern.

Her swing speed is around 90, on the border of TSi-1 and TSi-2. She uses a 40's g shaft on the TSi-2. Good luck.

Thanks Don! In the end, the TSi1 with the 40g shaft gave me not only the best numbers, but also the best feel. The Aldila Ascent ultra lightweight shaft is a home run, especially when paired with the TSi1 head. Super impressed by this package Titleist has put together!

I have been able to find out the answer to Carl's question. Specifically the Total Head Weight of the Titleist TSi1 Driver. Any help would be appreciated, it is nowhere to be found online, only that it is 40g lighter than most drivers. For a $550 investment the data would be nice to have.

I am looking at the TSI 1 driver with the 40g R2 Ascent shaft customized to one inch longer. I understand this will increase the swingweight. I am currently playing an Epic Max with a similar configuration. I see an option to reduce the TSI1 swingweight by -2 or -4 on a website. Which will get me closer to this clubs original SW?Any recommendations?