Does anyone know off the top of their head the seatpost diameter for an Elf mini? I know it is smaller than 22.2mm since the mini Uni on it doesn't even come close to fitting the FMF jr. cruiser I'm building. The kid finds the Uni to hard for his butt. I think he should just buck up and learn to deal with it since I rode a Uni turbo till I was 20. If I had a micrometer I would just measure it, but that's one tool I have never got around to buying.

13/16 Lot;s of old mini's used that size.

13/16 Lot;s of old mini's used that size.

Thanks, I'll look into that. The only other thing I can think of is that the spec sheet on my son's FMF jr. cruiser is off and the ELF really is 22.8mm (7/8ths). Right now we are running the mini Uni with no shims.