Product Description The can be used for 5-arm cranks with a 130 mm bolt circle diameter and is also compatible with Flattop chains. Specifications: Application: Gravel, Cyclocross, Road Mount: 130 mm bolt circle diameter, 5-arm Teeth: 38 T, 40 T, 42 T, 44 T, 46 T, 48 T, 50 T, 52 T Gearing: 1x9-speed, 1x10-speed, 1x11-speed, 1x12-speed Technical Information: Material: aluminium (7075-T6) Compatibility: Crank: - 5-arm cranks with 130 mm bolt circle diameter - not compatible with Shimano Dura-Ace 9000 or Ultegra 6800 - not compatible with Campagnolo CX10/11 Chain: - all 9-speed, 10-speed and 11-speed chains - SRAM Flattop, SRAM Eagle, Campagnolo and KMC 12-speed chains - 10-speed chain recommended for 9-speed drivetrains Chainring Bolts: - 6 mm bolts for 1x (original bolts for 2x do not fit) Features: - Wolf Tooth Wide-Narrow design - mounting position outside or inside (sufficient distance to chainstay provided) - chainline varies with mounting position - Made in the USA Note from the manufacturer: - On SRAM Exogram cranks with inserted nut, a special bolt with a spacer must be used at the 5th position (Force CX1 bolt). - With 38 t, slight contact of the spider to the chain is possible; possibly file off the spider arm a little bit. - It is best to use a clutch rear derailleur. For very muddy conditions, a chain guide in combination with a clutch rear derailleur is recommended. Technology: Drop-Stop® B Wolf Tooth has invested countless hours in the design, prototyping and testing of their Wide-Narrow chainrings and has developed a highly innovative tooth profile. Test riders around the world have confirmed that this design brings unparalleled performance. The right side of the chainring tooth has a different shape than the left side. The right side transmits the power to the chain and the left side opens a free space for cleaning mud and dirt. Since the two sides have completely different functions, it makes sense to design them differently, true to the motto: extra reinforcement where you need it, less material where you don't. The right side of the Drop-Stop tooth is as wide as possible to distribute the load over a larger area, which also minimises wear. The left side of the Drop-Stop tooth helps to guide the chain, but it does not transmit any load. Therefore, the left side is narrower than the chain roller. Wear is not an issue on this side, so Wolf Tooth was able to save material and create a better mud clearance channel. More free space means less friction and less chance of the chain being dropped due to mud. In the B version, the Drop-Stop profile is optimised for use on wheels with drop bars. The teeth are slightly narrower and the valleys between the teeth are deeper to accommodate the larger rollers of SRAM Flattop chains. The outer sides of the narrow and wide teeth touch the chain to guide it. Manufacturer Numbers: 38 tooth: 13038FT 40 tooth: 13040FT 42 tooth: 13042FT 44 tooth: 13044FT 46 tooth: 13046FT 48 tooth: 13048FT 50 tooth: 13050FT 52 tooth: 13052FT Contents: - 1 x Weight: - black | 38: 52 g - black | 40: 60 g - black | 42: 62 g Manufacturer: Wolf Tooth Components 6400 W 105th St Bloomington MN 55438 USA info@wolftoothcomponents.com Distributor: Cosmic Sports GmbH Leyher Straße 47 90763 Fürth Germany info@cosmicsports.de