2011 Stumpy Elite front fork ?/HELP...............

[Sound Solutions]

I have a 2011" stumpy elite which has the 140mm rear and front shock. I wanted to reduce the size of the shock and do a 120mm or run the same talas fork thats on the Fsx expert carbon. I was wondering if the geometry of the bike would be affected. I also heard that u can have your front shock adjusted to 120mm and that it's a one time thing. 140mm is a little to much for the trails here in Houston. Thanks again for any help or comments.