What does R stand for in bikes?

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Tags

1. #using
2. #ready
3. #industry
4. #things
5. #means
6. #stands
7. #short
8. #pretty
9. #suffix
10. #rennsport
11. #german
12. #either
13. #usually
14. #replica
15. #therefore
16. #racing
17. #being
18. #thing