Too short for Nimbus 36?

I have just upgraded my big airfoil wheel with a Nimbus 36" frame. For the moment I am using 152 mm cranks but later I want to shift to my 127 mm cranks. Difference in height: 25 mm. But there is only 12 mm of saddle post left. How do I solve this problem?

In a perfect world you would need to raise your saddle (152mm-127mm) or 25mm. Do you have a fancy, expensive seatpost? Can you get a longer one?

Man, I am sorry. It must be the heat. I was totally confused when writing that post. I don’t have to lower the saddle when using shorter cranks – I will have to raise it. Thanks anyway, Harper. :o