From Wikipedia, the free encyclopedia
Cadwyn rholer yw cadwyn beic, sy'n trosglwyddo pŵer o'r pedalau i'r olwyn yrru, ac felly'n gyrru'r beic ymlaen.
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| Math | tsiaen rhowlio, rhan o feic  |
|---|---|
| Rhan o | beic |
 Ffeiliau perthnasol ar Gomin Wicimedia | |
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