CNC machined from 7075-T6 billet aluminum, our door strengthens this critical area and provides rigid support for the transmission shafts. Includes grade 8 mounting hardware, shift drum bushing, main and countershaft ball bearings and circlips installed for your convenience. Made in USA.

Weight1 lbs

Country of Origin

Engine Type


Transmission Type

Customers' review

Rated 5.00 out of 5 stars
1 review
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1 review for Zipper’s Billet Door for 5 Speed Sportsters®

  1. 5 out of 5

    Billet trapdoor I put one of these trapdoor plates on my 1991 Sportster with gear set from a 1999 Buell M2. Works great to stop missing a gear when running my bike hard. 18000 miles on transmission. Crashed it last July when a pickup truck did a left turn in front of me! Bike exploded on impact and burnt to a crisp and broke my bike in half! Today I am up and barely walking again. Lucky I had my helmet on!

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