I am interested to buy a rear hydration option compatible with my ISM PS 1.1 saddle. I have seen the Delta 425 mount and I think it is a good option. Any recommendations? Also, I was wondering how my bike is going to hold on the transition area if I have the rear mount attached to it. As you know it is a noseless saddle I was planning to hold it from the rear, but not sure how to do it now. Any suggestions?
it still has enough of a nose to hang from a transition bar.
I have the 425 and it works great.
You will be fine to rack from the nose.
For a single bottle - Consider drilling a hole in the back of the saddle and using zip ties on the xlab gorilla cage.
It works great.
Tririg has some pics of the zip tie approach on Andy Potts’ bike from a bunch of years ago.