Originally Posted by
Winfried
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Edit: It looks like other items can replace the side pull brakes on the Brompton with no further work:
HS33 R Urban
HS33 R Urban*| MAGURA
By the looks of it, the caliper brake arms are almost certainly not going to be long enough to reach the rim braking surface without either the brake mounting bolt or using extended brake shoes. You may even need to do both.