I recently bought a new seatpost (Nitto S-83); a great deal at 35% off. Unfortunately when it arrived it was a 300mm and I ordered a 250mm. I emailed the vender and they said they would pay postage for the return but they don't have any 250mm to replace it with. Due to the fact that I can just cut it down I declined. The issue now is how short. The post the new post is replacing was a 250mm, but even it was long longer than it needed. The bike has standard geometry and can use a very short seatpost, i.e. less than 180-200mm would work with plenty to spare. Is there any reason I should not cut it down to 200mm?