Chain & Sprocket Kit Contents: 14T Front Sprocket - SPF124814C 52T Rear Sprocket - SPR89952C 116 Link RK Chain - RKPGB520MXUX116 RK Kit Box - SPRKITBOX RK chain and sprocket kits are the perfect drive maintenance kit for your bike, including a strong and durable 14T front and 52T rear steel sprocket, constructed from SCM420 chromoly steel alloy (front) & C45 high carbon steel with a electroplated Zinc finish (rear) paired with a high-quality UW-ring RK chain this kit has everything you need to replace your old warped and stretched chain and sprockets. The perfect alternative to expensive OEM replacements while designed to meet and exceed OEM specifications. Supplied in presentable packaging with a carry handle for convenient transportation. About the Chain: Featuring RK's Ultra Thin Seal technology, the seal thickness of the MXU series UW-rings are less than 50% of the common seal. Made for professional enduro/motocross racers. The UW-rings significantly improve chain life by lowering friction over your conventional heavy duty chain, while the ultra thin seals reduce weight compared to a O or X-ring chain. Fits: KTM 250 EXCF 2014-2016 250 EXCF SIX DAYS 2015-2016 300 EXC 1998 350 EXCF 2012-2016 350 EXCF SIX DAYS 2015-2016 450 EXC 2013-2016 450 EXC SIX DAYS 2015-2016 450 EXCF 2017-2020 450 EXCF SIX DAYS 2017-2020 450 SX 2004-2006 450 SXF 2007-2019 450 SXF FACTORY EDITION 2015 450 XCF 2008-2009 505 SXF 2007-2008 505 XCF 2008-2009