The official announcement of an SRAM XX1 * 11

SRAM has long been said that the summer will be a new group of top cross-country components, and so it happened: a star on the system, eleven on the tape.




In an official press release lists all the details of the new group. It will be available in October this year. The group of SRAM XX1 is a completely new rear derailleur that has an interesting range of motion for a massive 10-42 cassette. Carbon fiber rods are also very far from standard, designed specifically for single-speed transmission star rods are narrow and wide teeth at the same time to fit inside the inner and outer chain links and is well to keep the chain. Magazine has a new mount for XD Driver Body frihab while under the bushes 11 speeds are only available in SRAM, DT Swiss.

SRAM XX1 system

As mentioned, the system of alternating teeth, narrow tooth - a tooth wide. As stated by SRAM, these teeth increase the adhesion strength and stability. It is obvious that such a structure, the star system will be available only with an even number of teeth: 28-30-32-34-36-38. Will be offered in both popular formats BB30 and GPX. Star in the system can be replaced without removing the rods from the bike. All the stars with the same mount, so you can freely change one to another, the truth will have to adjust the length of the chain.

Claimed weight of the system XX1 to the bottom bracket BB30 - 650 grams, or about 50 grams lighter this double system.

Magazine during the first tests began with 9-36, but in the end it degenerated into a 10-42. Star 10 will not be fixing the cassette to the hub as previously expected. Weight tapes turned out 260 grams (compared to desyatiskorostnaya Cassette SRAM XX 11-36 weighs 208 grams).

The range of teeth 10-12-14-16-18-21-24-28-32-36-42 until there is only a cassette with this set of stars. SRAM does not explain why adding a star with an odd number of teeth - 21.

The tape is made Wholly - X-Dome design. The new bush XD Driver body, with the diameter becomes smaller the farther away from the wheel, it is made to fit a small desyatizubuyu star. Such an idea is not new, of Hope and Kappius Sea Otter at the show were like bushes. DT Swiss says that inside the sleeve, nothing has changed, only the form frihaba trimmed to fit the star 10. It is stated that this design is open to other manufacturers bushings and you can use it without a license. SRAM promises that this frihab 6-8 grams lighter than usual, and that they provided a more stable relationship between the cassette and hub.

As a rule, multi-speed systems need assistance to properly shift the front gears. It is logical to assume that the chain of SRAM XX1 would wear out faster. But SRAM says that solved the problem. The chain of XX1 "is optimized for use without a forward gear." SRAM circuit covered a new coating to reduce wear. That is, this circuit you can not use a system of double and variable tooth profile system means that you can not use the chain Shimano.

Rear Derailleur SRAM XX1

Some of the biggest changes occur in the rear derailleur. A parallelogram is set at an angle to move the top spot on the diagonal along the bottom of the cassette. Rear Derailleur XX1 X-Horizon can operate at the position of rollers in a horizontal position. In order to reduce slack in the chain and the noise of SRAM uses the principle of Type2 from their group X0. It also dramatically improved cable routing, and now it is made like a group of highway SRAM Red.

This schematic drawing shows the performance of rear derailleur SRAM XX1 X-Horizon In comparison with the conventional switch. Claimed weight of the rear derailleur 220 grams (181 grams weighs switch to SRAM XX).

In general, weight loss of slightly hindered heavy-weight cassette and rear derailleur, but the system and the absence of the front transmission was able to save quite a lot.