The new 2021 Polygon Siskiu D7 has become one of the most popular and highest selling dual-suspension bikes for Polygon. Capitalizing on extensive R & D , state of the art testing facilities, and feedback from top-level riders, the Polygon Sikiu D7 defies what an outstanding value dual-suspension mountain bike is capable of. This year's host of upgrades tick all the boxes for those looking for a bike with modern geometry, great XC pedalling efficiency , and all-mountain capability . The D7 is built around a lightweight , ALX aluminum boost frame that boasts a modern rider's modern geometry . The bike now has a slacker head tube angle, more extended reach, lower BB, and shorter chain-stay to boost your performance in climbing or to descend, no matter the distance, technicality, or gradient. Polygon has also revised kinematics on the Si