Sorry I should mentioned this - it's 170mm long.
I doubt it's going to work with GXP - spindle diameter is different, but maybe I am wrong.
Length is perfect, but quick search shows that bb30 has 30mm spindle diameter, gxp 22mm. I have same problem as you but on the opposite side. Thanks
@Cloak/Dagger started
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Sorry I should mentioned this - it's 170mm long.
I doubt it's going to work with GXP - spindle diameter is different, but maybe I am wrong.