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Originally Posted by bootsie
by shortening the shock to 8.5 i2i, you actually forfiet .8". its because a quarter inch of shock stroke doesn't translate to a quarter inch of wheel travel. if that where true, then if you had a 2.5" stroke shock, youd have 2.5" of travel on your bike. thats obviously not true.
to find the new travel, you have to set up a porportion:
8.2 inches of travel/2.75 inches of stroke = X (the new travel) / 2.5 inches of stroke.
cross multiply, and get 20.5 = 2.75X, divide both sides by 2.75, and get 7.45 inches of wheel travel.
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no one ever said a quarter inch lost in stroke equals a quarter inch lost in travel. I think everyone is aware that stroke does not equal travel. 8.25" of travel to 2.75" of travel is a 3:1 ratio, so a 2.5" shock in the same eyelet holes will approx get 7.5" of travel. 0.75" difference in travel between the 2 shocks. I simplify and say it is about a half inch because it barely feels like you have lost any travel and because when you sit there and measure it on the frame to see the difference, it tends to give you a little more then on paper. You dont really get a full 8.25 in my opinion and you get a little more then 7.5 with the new shock. Do it without the spring on the bike and make the measurements.