Has anyone used this at-home sit bone measuring kit? I just ordered one, for the heck of it. I've been measured at my Trek store using their Bontrager butt measuring device...but I guess I'm skeptical of just one opinion. I'm curious to see if I end up measuring the same (150mm), with this home kit -

http://www.wekeepyoucycling.com/en/p...ring-tool.aspx

It's a bit pricey with the shipping charges, so I'm hoping it will be worth the money.