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2. Bottom bracket - Wikipedia

   en.wikipedia.org/wiki/Bottom_bracket

   However, Cannondale moved on from that system and developed the SI cranks and the new BB30 unthreaded press-fit bottom bracket standard. BB30 requires special frames which have a 42 mm diameter unthreaded bottom bracket shell (which is larger than the 34.9 mm threaded ISO standard threads) allowing use of internal sealed bearings while their ...

3. List of bicycle parts - Wikipedia

   en.wikipedia.org/wiki/List_of_bicycle_parts

   There is a bearing surface on the spindle, and on each of the cups that thread into the frame. The bottom bracket may be overhaulable (an adjustable bottom bracket) or not overhaulable (a cartridge bottom bracket). The bottom bracket fits inside the bottom bracket shell, which is part of the bicycle frame

4. Talk:Bottom bracket - Wikipedia

   en.wikipedia.org/wiki/Talk:Bottom_bracket

   The semi-axles attached in the middle of a standard BSA bottom bracket shell with a Hirth type joint and internal bolt. In 2004 Lightning licensed their design to Specialized Bicycles, who incorporated the design into their FACT carbon crankset and frame which utilized a BB30 bottom bracket shell with pressed in bearings.

5. BMX racing - Wikipedia

   en.wikipedia.org/wiki/BMX_racing

   There are two BMX racing bikes sizes. The first is the 20-inch (ISO 406mm) wheel bicycle. The 20" wheel bikes are referred to as "Class" bikes, with an outer tire diameter up to 22.5". The second type is "Cruiser" bikes which are any bikes with an outer tire diameter larger than 22.5". The most common cruiser size uses a 24" (ISO 507mm) wheel. [6]

6. Bicycle saddle - Wikipedia

   en.wikipedia.org/wiki/Bicycle_saddle

   A bicycle saddle, sometimes called a bicycle seat, is one of five contact points on an upright bicycle, the others being the two pedals and the two handles on the handlebars. (A bicycle seat in the specific sense also supports the back.) [ 1 ] The bicycle saddle has been known as such since the bicycle evolved from the draisine , a forerunner ...

7. Raleigh Chopper - Wikipedia

   en.wikipedia.org/wiki/Raleigh_Chopper

   Until the BMX came along in the mid-1980s, the Chopper outsold other bikes by 6 to 1. In 2014 a 1980 MK2 Raleigh Chopper gifted to US President Ronald Reagan sold at auction for a record $35,000. The Chopper was designed in response to the Schwinn Sting-Ray , [ 1 ] [ 2 ] and an earlier attempt, the Rodeo, which was not commercially successful ...