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Westwood Rim
From WikiPedalia
The old-fashioned type of rim usually seen on roadsters. Westwood rims have rounded sides, so they are not suitable for use with caliper brakes. They are designed to be used on bikes with rod brakes, where the brake shoes rub on the inside circumference of the rim. The Westwood profile has a ridge between the braking surfaces. The spoke holes are drilled into this ridge, and the ridge protects against the brake shoes hitting the nipples.
Westwood rims are most commonly seen in the 635 mm (28 x 1 1/2) size, but they were made in most of the middleweight British sizes.
