The tyres are on there because it's used, alot, and i don't want to wear out the kevlar skinwall Specialized tyres that used to be on it.
The risers are comfortable, i like the bend on these, like the bike I'm no spring chicken any more
F1 & F2's are basically the same, the 2's having alloy legs instead of the cro-mo ones, F3 had a different linkage path to give rising rate on the spring and a bit more travel. F4's....a whole different fork again.
B2's, the original AMP, had a longer shock body. The stays clamp around the end cap. B3's had a shorter shock and the stays clamp around the shock body, not the end cap. The B3 also had CNC machined parts aplenty.
Amplifier 2 was a completely different bike and had nothing to do with AMP.
Here's Risse's drawings for the B3 shock http://www.risseracing.com/applications ... /50139.gif
and the B2 shock http://www.risseracing.com/applications ... /50107.gif
Hope that make sense.
"Life is not a journey to the grave with the intention of arriving safely in a pretty and well preserved body, but rather to skid in broadside, thoroughly used up, totally worn out, and loudly proclaiming 'WOW-What a Ride!'"