Upgrade your riding experience with the new IRC SX, designed and tested in France specifically for riders with big WATTS.

Built to address common issues faced by riders such as hard spots, chain tension, and adjusting the rear wheel when changing the crown, the IRC SX is the ultimate solution.

Featuring a longer cage fixed on a CNC stainless steel axle, articulated using two annular bearings and a stainless steel spring, the IRC SX System ensures permanent tension on the chain. The derailleur wheel and Teflon pulley, mounted on annular bearings and stainless steel axles, provide smooth and efficient pedaling with reduced resistance.

With its innovative tensioning mechanism, the IRC SX eliminates hard spots caused by crown, pinion, or crankset, thanks to the spring mounted cage that automatically corrects any defects in your transmission parts' machining.

Plus, changing the crown without removing the rear wheel is now possible, making it a convenient option for training or races, saving you valuable time with just 2 minutes of handling.

Designed with precision and manufactured with high-quality materials, the IRC SX boasts a CNC body/yoke junction axle in Z15Cn17 stainless steel, heat-treated stainless steel tension spring, and a CNC derailleur pulley axle in Z15Cn17 stainless steel.

Available in two versions to fit various standards of horizontal dropouts, including 20 mm, 15mm, and 10mm, the IRC SX is completely removable with just an Allen key. With an adjustable horizontal chain tensioner featuring two stainless steel Allen screws, achieving the perfect tension is easy.

Weighing in at a mere 165 grams, the IRC SX comes with a left chain tensioner, an 11-tooth aluminum derailleur pulley mounted on sealed bearings, and a Teflon pulley also mounted on sealed bearings. Plus, with the 15 to 10mm adapter made of CNC aluminum, installation is a breeze.

Please note that the IRC tension system is not compatible with 1/8" chains. Upgrade to the IRC SX and revolutionize your ride.

- Designed, developed and tested in France.
- Comes with the left chain tensioner
- Available in two versions, to be adaptable to several standards of horizontal dropouts of Ø 20, 15 and 10mm.
- IRC completely removable with Allen keys.
- Adjustable horizontal chain tensioner with 2 stainless steel Allen screws
- 11-tooth aluminum derailleur pulley, mounted on sealed bearing.
- Teflon pulley, mounted on sealed bearing
- CNC body / yoke junction axle in Z15Cn17 stainless steel mounted on 2 annular bearings.
- Heat-treated stainless steel tension spring
- CNC derailleur pulley axle in Z15Cn17 stainless steel.
- 15 to 10mm adapter in CNC aluminum

Weight: 165 gr (right + left tensioner)


*ATTENTION* our IRC tension system is not compatible with 1/8' chains