Question Fin angle degrees and replacement

[Andeok]

Hi, I'm hoping someone can help with understanding fin angle degree and blade replacement.

I'm trying to buy my first set of long fins online...I want to start with plastic and upgrade to glass or carbon if need be - 95% of my diving will be shore entry over nasty volcanic rock diving to around 15 meters max. Im certain the entry will destroy glass or carbon blades in no time at all.

Im edging towards a pair of Cressi Gara Modular impulse with an advertised 29 degree angle...my question is....if I decide to change the blades am I limited to only blades with a 29 degree angle or will the Gara footpockets accept a blade with 20 degrees like the leaderfin ice?

Completely clueless in this regard with no one to speak to locally (language barriers).

Any advice would be greatly appreciated.

 

[hteas]

Before worrying about blade angle, you need to figure out whether the footpockets fit well. It really is a big issue.
As far as the angle, the footpockets "should" be amenable to a variety of angles. Ten years ago 10-11 degrees was normal. It's now common to see 20-22 degrees.
If the footpockets fit, then, worst case, you can go with cressi replacement blades.