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Seat tube: the roughly vertical tube in a bicycle frame running from the seat to the bottom bracket; Seat bag: a small storage accessory hung from the back of a seat; Seatpost: a post that the seat is mounted to. It slides into the frame's seat tube and is used to adjust ride height depending how far into the seat tube it is inserted
The 'diamond' frame's central, horizontal top bar forces the rider to swing a leg over the bicycle's seat. A Triumph step-through, ladies', or open frame Dursley Pedersen bicycle circa 1910 A penny-farthing photographed in the Škoda Auto Museum in the Czech Republic A Brompton folding bicycle Bicycle in Victorian Plymouth, England, with a predecessor of the Starley diamond-frame A cantilever ...
A Step-through frame is a type of bicycle frame, often used for utility bicycles, with a low or absent top tube or cross-bar; A push bike is a form of bicycle without pedals such as the drais 1820 which is one of the first verifiable push bikes.
Other exotic frame materials include titanium and advanced alloys. Bamboo, a natural composite material with high strength-to-weight ratio and stiffness [58] has been used for bicycles since 1894. [59] Recent versions use bamboo for the primary frame with glued metal connections and parts, priced as exotic models. [59] [60] [61]
A 2008 Specialized Stumpjumper with full suspension A 2008 Specialized S-Works Transition carbon triathlon/time trial bike. In 1995, Specialized launched the Full Force brand. [13] Full Force was a lower-end mountain bike brand sold through sporting goods stores and discount retailers such as Costco. [5] The move angered some Specialized dealers.
A 2008 Specialized Stumpjumper with full suspension. The Specialized Stumpjumper is a mountain bike produced by Specialized Bicycle Components. When it was first produced in 1981, the Stumpjumper was the first mass-production mountain bike. The Stumpjumper is still in production, although its design has changed significantly since it was first ...
The National frames have a long top-bar to the frame (17 in or 430 mm) giving them long lugs of 1 + 1 ⁄ 2 in (38 mm) that rest on the runners. In its original form, the National hive provides 3 ⁄ 8 in (9.5 mm) bottom beespace—that is, the top surface of the frame bar is flush with the top of the box, and the lower surface of the frame is ...
Downhill frames are also overbuilt to handle the stress of riding over rocky terrain, drops, and jumps. Bike weights have been typically over 34 lb (15.4 kg), but modern downhill bikes have broken the 30 lb (13.6 kg) weight barrier (with some custom builds on carbon frames weighing between 27–29 lb (12–13 kg)).