Wolf Tooth makes excellent components and solutions for riders who want a little extra out of their bikes. The GC 40 and GC 42 are giant cogs that give riders extra large gearing so they can climb tougher hills. However, when you use these cogs, you might start running into compatibility issues. When using the GC 42 or GC 40 with a Shimano rear derailleur, a longer B-screw may be needed. This is a high quality, 18-8 stainless steel M4 x 25 mm screw.
CALIFORNIA PROPOSITION 65 WARNING: This product can expose you to chemicals including (Cadmium, Phthalates, Bisphenol, Nickel (Metallic), di(2-ethylhexyl)phthalate "DEHP"), which is known to the State of California to cause cancer and/or cause birth defects or other reproductive harm. For more information, go to www.P65Warnings.ca.gov.
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