Most racedays with other riders
Riders sorted by the number of times they started in the same race as Riku Onaka.
| # | Rider | Number of races |
|---|---|---|
| 1 | TERADA Yoshiki | 7 |
| 2 | WATANABE Kazuki | 6 |
| 3 | KAMIMURA Taiki | 6 |
| 4 | IWATA Seiya | 6 |
| 5 | UWANO Hayato | 6 |
| 6 | ITO Kyo | 5 |
| 7 | MURAKAMI Yujiro | 5 |
| 8 | KITASHIMA Keita | 5 |
| 9 | AMANO Takeharu | 5 |
| 10 | UDAGAWA Rui | 5 |
| 11 | HAYASHIBARA Shoma | 5 |
| 12 | SHINGUU Soutaa | 5 |
| 13 | ABE Takayuki | 4 |
| 14 | KARIYA Kazutoshi | 4 |
| 15 | MORIMOTO Rintaro | 4 |
| 16 | TANI Junsei | 4 |
| 17 | YAMAMOTO Masaki | 4 |
| 18 | WATANABE Shotaro | 4 |
| 19 | SATO Hikaru | 4 |
| 20 | KOMOTO Ryota | 4 |
| 21 | SHINOZAKI Sohei | 4 |
| 22 | MEIJERS Jeroen | 4 |
| 23 | YAMAGUCHI Eiji | 4 |
| 24 | ITSUZAKI Mizuki | 4 |
| 25 | SUGENO Aira | 4 |
| 26 | HAYASHI Reon | 4 |
| 27 | IKARASHI Kota | 4 |
| 28 | IZAWA Masaya | 4 |
| 29 | YUASA Hirotaka | 4 |
| 30 | SUGAWARA Satoshi | 4 |
| 31 | TSUDA Yugi | 4 |
| 32 | MIYAKE Taisei | 4 |
| 33 | ONODERA Rei | 4 |
| 34 | TAMASHIRO Shota | 4 |
| 35 | TSUDOME Ryo | 4 |
| 36 | KAMADA Koki | 4 |
| 37 | ABE Gen | 4 |
| 38 | NISHIO Keito | 3 |
| 39 | AOSHIMA Touya | 3 |
| 40 | NISHIO Hayato | 3 |
| 41 | KANEKO Daisuke | 3 |
| 42 | AKITA Keisuke | 3 |
| 43 | HIRAI Anshu | 3 |
| 44 | YOSHIDA Keigo | 3 |
| 45 | KAZAMA Haruki | 3 |
| 46 | TAKANASHI Mario | 3 |
| 47 | NAKAJIMA Ayumi | 3 |
| 48 | OKOCHI Masahiro | 3 |
| 49 | YAMAMOTO Tetsuo | 3 |
| 50 | SAWADA Toki | 3 |