The previous generation Madone was already an expensive bike and the upgrades haven't done anything to improve affordability, but the Gen 7 bike is a radical, distinctive take on the aero road bike. It's been replaced by the non-adjustable IsoFlow design, which cantilevers the seat mast over that split seat tube. Trek has also shaved around 300g from the bike's weight by removing its predecessor's adjustable IsoSpeed damping. There's another 10 watts saving on offer from the redesigned bar/stem, which has a significant flare, resulting in a more aero position when riding on the tops. Trek claims that this significantly improves airflow towards the rear of the bike, resulting in around a 10 watt energy saving over the previous Madone. The latest Trek Madone SLR Gen 7 bike takes a totally different tack to most aero bikes, with a seat tube that splits towards its top, leaving a large hole under the rider. Specialized Tarmac SL7 Comp - SRAM Rival AXS.Specialized Tarmac SL7 Expert - Shimano Ultegra Di2.Specialized Tarmac SL7 Pro - SRAM Force AXS.Specialized S-Works Tarmac SL7 - SRAM Red AXS.Specialized S-Works Tarmac SL7 - Shimano Dura-Ace Di2.The lower-specced Pro, Expert and Comp models share the same silhouette but with FACT 10r carbon for a frame weight of 960g. The S-Works models use the brand's FACT 12r carbon and will have a frame weight of 800 grams (size 56cm, painted). It also carries a frightening price tag, although lower spec bikes are slightly more affordable. The top spec bike comes with Roval Rapide CLX wheels, although surprisingly still with inner tubes. There's fantastic handling although the ride is harsher than the previous SL 6 model. Specialized has managed to make the Tarmac SL 7 as aero as many out and out aero bikes while still skimming the UCI's 6.8kg weight limit, even in the commercially available S-Works spec.
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