Shimano American Corp. announced Thursday that 2.5 million mountain bikes are being recalled due to faulty cranks that can break off and cause injury. According to the U.S. Consumer Product Safety Commission, this voluntary recall affects 1 million bikes in North America. An additional 1.5 million bikes are being recalled in Europe. Shimano’s cranks are present in mountain bikes made by over 49 bicycle manufacturers.

The cranks, which connect pedals to the frame and chain mechanism, have failed in at least 630 documented cases, resulting in 23 injuries. Affected cranks were manufactured between mid-1994 and mid-1995. The names of the cranks are Alivio, Acera and Altus. Model numbers, on the back or inner side of the right crank arm, are FC-CT90, FC-M290, and FC-MC12. These cranks are present on bikes manufactured by Bianchi, Cannondale, Diamondback, FT, Giant, Huffy, Motiv, Murray, Raleigh, Schwinn, Trek and Univega.

Shimano asks owners of affected bikes to discontinue usage until the crank is repaired. For more information, contact your bike dealer or Shimano at (800) 353-4719.