Horrific Brompton, "dual manual change chain ring" - inner larger than outer: http://www.ebay.co.uk/itm/Brompton-11-5kg-12speed-TITANIUM-light-weight-rack-handle-bar-forks-TRAVEL-BAG-/282685083530?hash=item41d1580f8a:g:QewAAOSwKcdZxWnr
@frankenbike started
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Horrific Brompton, "dual manual change chain ring" - inner larger than outer:
http://www.ebay.co.uk/itm/Brompton-11-5kg-12speed-TITANIUM-light-weight-rack-handle-bar-forks-TRAVEL-BAG-/282685083530?hash=item41d1580f8a:g:QewAAOSwKcdZxWnr