Newsletter
| Weight |
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Whilst weight remains a topical issue, it is more often than not quoted out of context, and with no understanding or reference to the much more important matter of mass. A typical downhill complete bike weighs in at around 43lbs. The AP-1 frame is designed to be slightly heavier than other models in this category for the following well proven reasons. Engineers refer to weight in terms of sprung and un-sprung mass ratio. The sprung mass comprises all of the components that are located above the suspension plus some of the suspension components themselves. The un-sprung mass comprises all of the components that are located below the suspension plus some of the suspension components themselves. When looking at suspension performance it is highly beneficial to have a high sprung to un-sprung mass ratio. This gives superior grip and ground-holding, to this end lighter bikes will be at a significant disadvantage as it is difficult to reduce the un-sprung mass by the same proportion as the sprung mass. The basic principles of the sprung to un-sprung mass ratios are very simple, for a high ratio very light wheels, swing arm, break callipers and suspension components need to be coupled to a relatively heavy main frame and a high ratio will be achieved. The AP-1 has an approximate mass ratio of 70/30 which is very high for this type a bike, giving excellent grip and suspension characteristics. This has been reinforced in various independent product reviews. Here is just a few of the resulting comments: “Its construction is flawless. Almost technical perfection.” Doddy, MBUK “In the real tough places the AP-1 performs better than any other production bike I’ve ever ridden.” Steve Jones, Dirt Magazine “The ride is nothing short of stunning.” Ali MacLennan, www.descent-world.co.uk |