Over time derailleur pulleys wear out. Either the bearings go bad, or the teeth wear down enough to negatively affect shifting performance. If your bearings are feeling notchy, or the pulley teeth have rounded out, it's in your best interest to replace the pulleys to get the most out of your...

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Shimano's groupsets often often miss call-outs for European elegance or relentless pursuit of weight loss at all cost and innovation for innovation's sake, instead earning their loyal following through the incredible dependability and meticulous engineering of the Dura-Ace CS-R9100 11-Speed...

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Aside from some slightly modified aesthetics and a 10g reduction in weight, the Shimano Dura-Ace Di2 FD-R9150 11-Speed Front Derailleur carries over the high functioning precision of its 9070 predecessor. While the new 9150 rear derailler gets all the attention for its mountain-inspired changes,...

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Shimano's new Dura-Ace Di2 RD-R9150 11-Speed Rear Derailleur boasts a sleek profile that practically hides from the wind and finally brings the Synchronized Shift functionality honed in the trail-focused XTR Di2 system onto the road. Enabling Synchronized Shift lets the Di2 system work its magic...

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As the rest of the industry scrambles to catch up, Shimano's Di2 groupsets continue to set the standard for precise electronic shifting with nearly endless customizability. The release of 9150 is the next evolution of Di2, bringing slightly updated aesthetics and even better shift functionality...

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It's hard to beat that giddy feeling of setting up your ride with Shimano's new Dura-Ace Di2 drivetrain, but there's always been the issue for those of us riding TT or triathlons. There's no question that we don't like opening up our dialed-in aero positioning to brake or shift on the outer bar,...

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If you, like a few of us old souls around the Competitive offices, are holding fast to your belief in the soul of mechanical shifting, Shimano hasn't abandoned you. Though the world may very well be moving towards 100% electronic drivetrains someday in the future, mechanical still makes a hell of...

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Across Dura-Ace 9100, Shimano made subtle, rather than monumental, shifts in design to improve a system that was already pretty damn good. Proving that mechanical drivetrains can--and still should--be improved, Shimano focused most of its attention on the derailleurs, making the biggest changes...

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At a time when electronic drivetrains are gaining unstoppable traction, we appreciate that Shimano chose not to neglect its storied pro-level mechanical drivetrain for Di2, making careful, meticulous updates that have resulted in subtle, but significant, improvements to functionality. For those...

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The Shimano Dura-Ace ST-9150 Di2 Shift/Brake Lever delivers quick, intuitive shifting to give us the confidence to tackle any race or training ride. It features a dedicated brake lever shape, contact point, dedicated shift panels, and an ergonomic shift lever position to keep our hands...

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