Getting more than two popups usually means you're visiting websites designed to give you a popup. Deciding to go UK-permanent after two sellout temp stores: Tokyobike, swinging doors in Shoreditch today with a typically understated, two-floor layout that sees the two-wheelers up top, and a workshop in the basement for fixing anything that brakes.
Rollers are all designed for the city "in the same way a mountain bike is designed for the mountain", by making frames from high-grade Cr-Mo alloy steel (stronger, more flexible, and lighter than aluminum, with the whole package weighing just 10kg); meanwhile, the wheels' smaller (65cm) diameter -- or "finer-profile" -- provides for quicker acceleration, easier handling, and the ability to appear in Cosmo without looking fat.
The lineup starts with the classic 8-speed CS, runs through a range of adjustable single-speed fixies, and ends with athletically inclined Sport models (upgraded with 9-speed Shimanos, forward posturing, and raised handlebars), and everything comes in "virtually any colour you can imagine", excluding "magic".
The store's also happily taking part in the UK's new Cycle Scheme, wherein your employer part-purchases your wheels in exchange for hefty tax breaks from Johnny government, saving you around 50% -- if that doesn't give you a popup, nothing will.