The name says it all. This combination of linkages and shock yoke allow you to install a 230x65mm shock on your bike. This has some serious implications as far as shock set up and ride quality go. The set up yields 165mm of travel and 35% progression. That combined with the 65mm shock stroke dramatically lower the shock pressure required to get 30% sag while increasing bottom out resistance by a minimum of 12%. For heavier riders in particular, this is a huge improvement. You can expect a 20-25% decrease in air pressure. That said, this isn't only for heavier riders. If you want a set up for this bike that goes above and beyond when it comes to descending, this will be of benefit to you even more than our link for the stock shock.