Two persons were arrested following the incident, they added.
The rally was taken out by activists of the Hindu Yuva Vahini and Bajrang Dal in the wake of the killing of a youth, Chandan Gupta, in Kasganj last week.
Tilhar police station incharge Razi Ahmed said, "Workers of Hindu Yuva Vahini and Bajrang Dal were today taking out a motorcycle rally, when there was a dispute between two of them over money."
One of the workers hurled a stone creating commotion while another was beaten up allegedly by fellow volunteers, he said.
Superintendent of police Subhash Chandra Shakya said a case was registered and two persons - Brijesh Kumar and Govind - were arrested.
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