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The Hive, eThirteen Release XCX.ST Seat Tube Mount Chain Guide

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FROM THE HIVE: The Hive announces the release of the XCX.ST, the most recent incarnation of the popular XCX chain retention system. The XCX.ST is a seat tube mounted variation of the XCX that mounts to frames via a clamping device similar to those found on most front derailleurs. This XCX.ST version solves the mounting issues common to frames utilizing BB30 and other press-fit BB designs.

The XCX.ST retention system is also a highly adaptable product. It incorporates the adjustable upper wearplate of the World Cup winning LG1+ guide, is available in a “high-mount” or “low-mount” clamp design, utilizes a trick seat tube clamp cam to allow for chainline adjustment, and can be mounted to frames with 28.6, 31.8 or 34.9 seat tube diameters.

“The need for a lightweight, reliable single ring retention system designed specifically for cross country riders and racers was originally recognized by e*thirteen more than 8 years ago,” said International Distributor and OEM Coordinator Jonas Mikolayunas, “and while we were set to charge forth with the product back then, it became apparent that the drivetrain technologies at the time were not quite equipped to handle the change. With the advent of the 10 speed MTB drivetrain and the 11/36 cassette, the XCX has finally found its place. When coupled with any of our odd tooth sized e*thirteen Guidering options, the XCX becomes a highly precise drivetrain tuning tool.”

The initial prototype of the XCX.ST first debuted on the race bike of Orbea cross-country rider Julien Absalon in late 2009. Since its first appearance and second place podium at the World Championship XC race, the XCX.ST has garnered much attention – enough attention to catch the eye of Specialized Bicycles.

“Specialized Bicycles was one of the first companies to understand the value this product possesses in our off-road cycling community, especially among the 29er crowd” added Jonas. “I give Specialized a lot of credit for recognizing the potential of this product and specing it on their Stumpjumper Expert Carbon 29 Evo. This spec goes a long way in legitimizing the 1×10 generation of riders who have been home-brewing “1-by” solutions in their garages for years now.”

(Editor’s note: this thing should be pretty hot for cyclocross, too!) Specs and more pics after the break…

As spec'd on the new 1x10 Evo model.
As spec'd on the new 1x10 Evo model.

tech specs:
backplate material: 6061-T6
frame mounting style: seat tube clamp – high or low
clamp diameter: 28.6/31.8/34.9
wearplate adjustment: adjustable
wearplate hardware: captive gold alloy
chainring range: 32-44t
chainline adjustment: 50 to 53mm
weight: 71-75 g
msrp: $99.95
global availability: fall/winter 2010




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13 years ago

Why is it that the drivetain tuning tool is only precise on the odd-number chainring options?

“When coupled with any of our odd tooth sized e*thirteen Guidering options, the XCX becomes a highly precise drivetrain tuning tool.”

13 years ago

Agree with the ‘odd chainring’ comment making no sense.

I am running an MRP 1X on my XC hardtail and love it and a Paul’s tensioner on my cross bike that is not a very good design. Iwas looking forward to this as the cross bike is BB30 but for $100 or twice what their BB mount guide costs I’d rather wait and see what MRP will come up with or hack together my own.

Nathan Balsdon
13 years ago

I think the “odd chainring” comment was in reference to being able to fine adjust your gear ratio. Eg: 32t is to easy but 34t is to hard…here try this 33t ring.

I have been running the BB mount XCX on my cyclocross bike for a while now. It works great but was such a pain to set up with road cranks… This looks great but it still looks like you cant adjust the reach so it still wont be great for set up narrower road cranks.

13 years ago

Why not just use an old front derailleur?

13 years ago

I’ve asked for this for a year on the MTBR drivetrain forum. I couldn’t wait any longer and got a MRP 1.x last month, which works great, BTW.

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