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Answer:

AND ANSWER IS A. 27.5

Step-by-step explanation:

What is the 650b or 27.5in wheel standard? ... A 650b wheel is one that's about 27.5 inches in diameter, when measured from tyre edge to tyre edge. This compares to 26in for a standard mountain bike wheel and 29in for so-called '29er' wheels (700c road wheels are also 29in in diameter).

650b, 700c etc are all old french metric tyre size designations. The ā€œ650ā€ denotes approximate outside diameter of an inflated tyre, the b or c refers to width. Originally the French system had tyre widths from a through to e with a being the narrowest.

27.5 inch bikes are absolutely not dead and could continue as a popular choice among riders for years to come, but 29 inch bikes certainly represent a threat to their market share. It used to be that the majority of mountain bikes had twenty six inch wheels.

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