I guess 8 since 97 if you count transferring bits from frame to frame.
97 GT Timberline – Got nicked
99(I think) Cannondale Super V loved that bike – Got nicked
2001 Kona Roast – Recently rebuilt good fun
c2003 Custom built Revel 4X frame – Sold full bike as never used it
99 GT Zaskar (from ebay) got me back into riding great bike but too large a frame – Brother now has it.
2006 DMR Switchback frame built up with bits from zaskar – Dad now has the frame
2005 Spech Enduro M (from ebay) great frame got me riding harder and faster again but was too small. – Sold on ebay
2006 Spech Enduro L (from ebay) just starting to get used to the larger size and am fine tuning the ride trying to find the weight spring for the back but so far so good.