On coins of Nicaea in Bithynia the lovers are shown riding in a biga accompanied, appropriately enough, by Eros.
* Nicaea in Bithynia, coins of Julia Domna and Caracalla (on FORVM, not illustrated here). These are variants of a medallion-sized coin of Antoninus Pius, in which it is Tyche, however, who is riding in the chariot with Dionysus (RPC IV, 7992).
Æ 27, 7 h, 11.40 g. [Obv. IOYΛIA AYΓOYCTA. Draped bust r.] Rev. NIKAIEΩN. Dionysus and Ariadne riding r. in a biga of centaurs led by a satyr; Eros, standing on the back of one of the centaurs, faces them.
Similar (Photo courtesy of Lübke & Wiedemann KG).
Here is a Hadrianic sarcophagus cover from Rome with a similar motif, though the wagon is drawn by panthers, not centaurs.
On coins of Maeonia in Lydia, Dionysus is shown with or without Ariadne, and riding in a biga of panthers.
* Maeonia in Lydia, coins (not illustrated) of Septimius Severus (without Ariadne), and of Trajan Decius (with Ariadne, biga from l. to r.).
The coin of Severus is as follows: 25.13 g, 12 h. Obv. AY KAI Λ CЄΠ CEΟ ΥΗΡΟC. Laureate, draped and cuirassed bust of Septimius Severus r. Rev. ΜΑΙΟΝΩΝ. Dionysus, holding thyrsus and reins, in chariot l. drawn by two panthers and guided by Eros; above, maenad left playing tambourine; in exergue, EΠΙ ∆ΑΜΑΒ CΑΒE INIANOY APX ATOB.
* On this medallion of Marcus Aurelius from Rome, Bacchus is riding alone in a biga of centaurs.
Reference: RPC IV, 7992
Reference: Waddington, Recueil général, 372
Nicaea / Caracalla
Maeonia / Septimius Severus
Reference: SNG von Aulock 8236
Maeonia / Trajan Decius
Reference: RPC IX, 721