Jisho

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だい
Noun
1. bicycle rollers
Wikipedia definition
2. Bicycle rollersBicycle rollers are a type of bicycle trainer that make it possible to ride a bicycle indoors without moving forward. However, unlike other types of bicycle trainers, rollers do not attach to the bicycle frame, and the rider must balance him or herself on the rollers while training. Bicycle rollers normally consist of three cylinders, drums, or "rollers" (two for the rear wheel and one for the front), on top of which the bicycle rides.
Read “Bicycle rollers” on English Wikipedia
Read “ローラー台” on Japanese Wikipedia
Read “Bicycle rollers” on DBpedia

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