Should be 27.2mm. My '88 and '89 Pinnacles are both this diameter. Easiest to find post size as well, so you should have no problem finding a replacement.ganjamun said:Hey guys, I have a Klein Pinnacle and wish to change the the seatpost to something else. Does anyone know the size? I pulled out the seatpost but the size was not indicated there.
I dont know the exact year but it's probably late 80s to early 90s.
Any help is appreciated, thanks