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2. 27.5 mountain bike - Wikipedia

   en.wikipedia.org/wiki/27.5_Mountain_bike

   The wheel size is sometimes erroneously called "650B" [8] [9] as a "marketing term" by some manufacturers for their 27.5", but the 650B size has traditionally been a designation for a 26 inch diameter (ISO ~ 40-584 demi-ballon tire) using the same ISO 584 mm rim [10] used by French tandems, Porteurs and touring bicycles.

3. Bicycle wheel - Wikipedia

   en.wikipedia.org/wiki/Bicycle_wheel

   Some hubs have attachments for disc brakes or form an integral part of drum brakes. Rear wheel of 1960s Bootie Folding Cycle with Sturmey-Archer drum brake. Disc brakes – a disc brake comprises a circular plate or disc attached to the hub which is squeezed between brake pads mounted within a caliper that is fixed to one side of the wheel ...

4. 29er (bicycle) - Wikipedia

   en.wikipedia.org/wiki/29er_(bicycle)

   Using the smaller rear wheel allows shorter and quicker handling frames, more options for rear suspension designs and lighter bicycle weight. [23] Another variation is to have a 26″ front wheel with a 29″ rear wheel (commonly called a "69er" though Trek introduced a "69er" in 2007 with a 29″ front wheel and a 26″ rear wheel). [24]

5. Bicycle brake - Wikipedia

   en.wikipedia.org/wiki/Bicycle_brake

   As coaster brakes are only made for rear wheels, they have the disadvantage common to all rear brakes of skidding the wheel easily. This disadvantage may, however, be alleviated if the bicycle also has a hand-lever-operated front brake and the cyclist uses it.

6. Bicycle tire - Wikipedia

   en.wikipedia.org/wiki/Bicycle_tire

   Many treads are omnidirectional—the tire can be installed in either orientation—but some are unidirectional and designed to be oriented in a specific direction. Some tires, especially for mountain bikes, have a tread which is intended either for the front wheel or the rear wheel. [44]

7. Fixed-gear bicycle - Wikipedia

   en.wikipedia.org/wiki/Fixed-gear_bicycle

   As a vehicle brakes, weight is transferred towards the front wheel and away from the rear, decreasing the amount of grip the rear wheel has. Transferring the rider's weight back increases rear wheel braking efficiency, but a front wheel fitted with an ordinary brake might provide 70% or more of the braking power when braking hard. [citation needed]