diff --git a/src/jimgw/prior.py b/src/jimgw/prior.py
index 2ab0bc1a..433b385a 100644
--- a/src/jimgw/prior.py
+++ b/src/jimgw/prior.py
@@ -292,8 +292,6 @@ class AlignedSpin(Prior):
     """
 
     amax: Float = 0.99
-    xmax: Float = 0.99
-    xmin: Float = -0.99
     chi_axis: Array = field(default_factory=lambda: jnp.linspace(0, 1, num=1000))
     cdf_vals: Array = field(default_factory=lambda: jnp.linspace(0, 1, num=1000))
 
@@ -310,8 +308,6 @@ def __init__(
         super().__init__(naming, transforms)
         assert self.n_dim == 1, "Alignedspin needs to be 1D distributions"
         self.amax = amax
-        self.xmax = amax
-        self.xmin = -amax
 
         # build the interpolation table for the ppf of the one-sided distribution
         chi_axis = jnp.linspace(1e-31, self.amax, num=1000)
@@ -319,6 +315,14 @@ def __init__(
         self.chi_axis = chi_axis
         self.cdf_vals = cdf_vals
 
+    @property
+    def xmin(self):
+        return -self.amax
+
+    @property
+    def xmax(self):
+        return self.amax
+
     def sample(
         self, rng_key: PRNGKeyArray, n_samples: int
     ) -> dict[str, Float[Array, " n_samples"]]: