I have an older Stumpjumper from the early 90s tht used to have the silver Specialized "Future Shock" on it. I took it it off long ago and was wondering if I should get a 390mm or 410nn axel to crown rigid fork. Does anyone have the original geometry specs on this bike? Its silver with purple lettering. I tried a 390mm axel to crown fork that I had around(1" steerer,need 1 1/8) and the BB height was a tad over 11", is that right?