AKA - Dave’s Extra Legitimate Travel Apparatus
As much as we would like to think that everyone will have the opportunity to test ride an Evil, the reality is most of you will buy based on reviews, friends, or Weagle's past successes.
So the following is straight from the horses mouth (Dave Weagle being the horse). The DELTA system was conceived to, among other things, achieve very complex leverage rate curves that can be used to tune for varying track conditions, spring, and damper parameters. The dual progressive leverage rate curve was developed for coil sprung downhill applications to take advantage of the speed sensitive shocks on the market. Mechanically, the system uses very compact links that can achieve a lot of angle and velocity change through the travel. We can tailor the leverage rate curve to really take advantage of the shock's valving and the way that a speed sensitive damper is designed to work. Ultimately the design achieves a high degree of suppleness early in the travel, with a very predictable high traction stage through the middle and a bottomless ramp at the end of the travel.
The whole suspension system, every attribute, is developed concurrently with each other, with the shock absorber, and with the bike's intended use and geometry in mind. Main pivot location was carefully chosen to give the best balance of acceleration and braking performance. This careful positioning lets the bike accelerate without the need for excess damping, which in turn helps us push the limits of shock setup as far as possible to achieve ideal damper setup for any World Cup track. One of the biggest advantages of the system is its ability to let riders and mechanics adjust frame geometry without changing leverage rate and wheel rate at all.
Additionally, different link kits can be used to make drastic changes in the bike's feel. These link kits are something that Evil's World Cup athletes will take advantage of to fine tune for the drastically different race courses that they compete on over a race season. There is no bad option. It all comes down to personal preference. If you like to run air shocks and a position sensitive damper, we can develop that tune. If you like your frame geometry low in the BB and slack in the head angle, or vice versa and anywhere in between, it's covered. Upgradeability, tune-ability, and personalization is what it's all about, finding that combination that's perfect for you and no one else.
The Flip Chip
At the heart of the Delta System, is a simple chip that we call the Flip Chip. At it's most basic, the Flip Chip allows riders to change bottom bracket height and head angle by flipping the chip. This adjustment, like we said above, leaves the leverage rate curve and orientation of the linkage unchanged. The slight offset in bearing bore creates a simple interface that allows the rider to personalize their ride. It's about finding what works for the way you ride and the terrain you ride in.
The Flip Cup
The Flip Cup is a proprietary headset design between FSA and Dave Weagle. The headset allows for either a +1° or -1° adjustment to the head angle of the frame. By simply removing and rotating the lower cup 180°, and reinstalling, a rider can adjust the head angle providing either tighter handling characteristics (+1°) or a slacker setup (-1°). Using the Flip Cup and the Flip Chip together provides the rider with four independent geometry positions to which they can customize and personal their ride. It's all about finding what's right for you, where you ride, and the way you want to ride.