Gone are the days of awkwardly putting together components which cover both road and mountain bikes and tossed them onto your drop bar dirt bike like Frankenstein creating living breathing monster. Instead we have our own groupset with Shimano GRX system released earlier this year - and now you can take this group beyond the usual cables with the GRX ST-RX815 Di2 shifter and disc brake caliper , which bring GRX onto the electronic stage. At first glance it's not much different from Ultegra Di2, well, at least inside. Its operation is the same and it offers the same benefits of programming, but on the outside you will find that hoods are a whole new beast. They have much sharper lean and gripping grip designed to reliably support you in the cab so an unexpected blow won't cause your hands to slip as well as a moved lever designed to facilitate access both on the hood and in the interior. drops so you can brake comfortably on rough terrain without risking everything.

The gear shift buttons are designed like this so that they are easy to reach both under the hood and in the trunk and they provide an audible click when upshifting or downshifting which gives a little extra peace of mind when you go 160 miles deep in a gravel race. and every conscious step matters. Same as the road version Ultegra The feeling of shifting gears is much like clicking a mouse: only 2 millimeters of movement is required on your part so you don't have to pay nearly as much attention to switching allowing you to pay more attention to the terrain ahead. On the other side Shimano uses BR-RX810 flat mount calipers for reliable Servo braking
Wave and cooling properties of brake pads Ice
Tech. Calipers work with modulation , similar to standard Ultegra but Servo
Wave provides improved feel right away because the pads move faster together at first and then slow down for better control when braking. This technology has been popular in the mountain bike industry for some time. , and now penetrates into gravel where we can enjoy the benefits of our off-road counterparts.