Answer

In the standard Jain vidhi I found, Dharmchakra tap is not simply an ekasana or biyasana tap. It has its own pattern: it begins with a prescribed fast/“bhakt” and then is done with alternate-day fasting, completing in about 123 days. ( jainqq.org)

Explanation

So if you are asking whether Dharmchakra tap should be done as ekasana or biyasana, the answer is: follow the specific vidhi of Dharmchakra tap, not a general ekasana/biyasana rule. Ekasana and biyasana are separate forms of tapas, while Dharmchakra tap has its own traditional schedule. ( jainqq.org)

Spiritual Understanding

In Jain dharma, tapasya should be done according to shastra-vidhi and under the guidance of a guru or acharya, especially for a vow as specific as Dharmchakra tap. The correct discipline is more important than choosing food rules by convenience. ( jainqq.org)

Takeaway

For Dharmchakra tap, do not decide ekasana or biyasana on your own. Use the exact vidhi of the tap and follow your sangh or guru’s guidance. ( jainqq.org)