The customizer wishing to mount extra wide tires without the problems of motor disengagement Zodiac offers engine shaft extensions of 12, 25, 35, 45 and 55mm, elongated nuts and spacer rings for the primary cranks that mount on all Big Twin from To 1970. To accommodate the greater load provided by the extensions of 45 and 55mm, the spacer ring is provided with a support pad installed. For the Softail until 1999, there is also the shifting support plate.
Crankshaft extensions for FLT from 1985 to 2006, FXR from 1985 to 1994, Dyna from 1991 to 2005 and Softail from 1991 to 2006 + 35 mm
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