B4029: Left Side, Rocker, Post Mount, 160 Rotor, 12 mm

B4029: Left Side, Rocker, Post Mount, 160 Rotor, 12 mm

50+ In stock

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This is a left side (non-drive) replacement insert for all of our adjustable rocker dropouts and is compatible with the Shimano E-Thru, DT Swiss RWS, and PMW combination head 12 mm skewers only. It is reverse-compatible with all of our rocker dropouts. It is made from black anodized 6061 aluminum and is supplied with a 12 mm through hole. The caliper mount is post style for 160 mm rotor disc brake applications.

Important Information

  1. For useful information on adjustable dropouts, including torque values for our bolts, click here.
  2. Choose the appropriate skewer based on the right side insert.
  3. Frames built for 135 mm x 10 mm spacing can use this insert with a 142 x 12 mm skewer (nothing wider).
  4. Insert compatibility is only guaranteed when used with a compatible Paragon Machine Works product.
  5. We are not able to advise or make recommendations on compatibility with products that are not manufactured by us.

Item sold individually.



Item Number B4029
Weight/Grams 77
Insert Type Post Mount
Skewer OD 12 mm
Plating Black Anodization
STEP File (right click, "save as") B4029
PDF Drawing B4029