Originally posted by Jim311
You don't seem to understand. Reguardless of HOW your rebound is setup, a dual suspension WILL BUCK! I've experienced it on tons of FS bikes, read it in tons of magazines...maybe you should do a little reseach. Show me a 20 pounds FS bike. Until you get a bike that is as LIGHT as a hardtail it will never be ass efficient. Is that a hard concept to understand? More weight = less efficiency because you have to haul it all down the trail. There's no way in hell you'd out-sprint a guy on a hardtail on your big hit... NO WAY. Does your friend weigh 350 pounds or something? I'd like to see you beat me to the top of the hill on that dog!
Not to switch sides but what you are describing is brake jacking and/or brake Squating. You are correct EVERY fs to date has some form in varrying degrees. But it is all dependant on where the pivot is and what gear you are riding in. Some designs have eliminated jack in the middle ring but still suffer greatly from it in the small ring. It also varries between the different four bar systems. One with a horst link has less jack (very little in fact) compared to a 4 bar designed by Kona which use a rocker system. Compare the 4 bar to a single pivot and the brake jack gets signifigantly worse. Compare again to a softtail system (I forget the actual name) and you actually referse the jacking (instead of bucking you off you get slammed into the ground when you brake). To say they all brake jack the same is very wrong. As designs get better the jacking will get better and in fact be reduced to nothing. Different linkages and designs are working on this. Dw at ridemonkey designed a linkage for Ironhorse hollowpoint that makes a great comprimize between braking ability without the jack. Horst linkage with its pivot lower and than the rear dropout reduced it signifigantly (fsr system) to the point where you really don't notice it. Santa Cruz has a v10 system which is also suppost to have reduced it (I believe as well as creating a near vertical travel).
Brake jack / bucking is in fact TOTALLY eliminated by a floating disc brake system found on some very high end dh bikes. this is also a third party adon except on Balfa bikes I believe which come stock with these on higher end models. Of course this isn't appropriate for xc rigs as it adds weight. this is a special feature designed for certain bikes and works extremely well. For example some of the best dh bikes are single pivot however these are renowned at jacking (bucking you up). Add the floating disc brake and whammo you have a single pivot dh machine that has no brake jack at all.
If you are talking about some other form of jacking (haha) I really have no idea what you are refering too because no one complains about being 'bucked' off if the suspension is setup correctly with proper rebound adjust, damping and weight ratio on the spring.