Big scrambler

Q. You and Rajnikanth, your careers have run parallel.
A. Parallel yet diverse. It was not by accident, but by choice. We used to sit beside a tree and talked about our future. He had this Shatrusaab style-throwing of cigarettes-and people enjoyed it. And I said, "Are you going to continue doing that?" He said, "Yes." I said, "I am going into serious stories." And he said, "That suits you and this suits me."
Q. I read you would do motor rides together.
A. When Rajni came in, I was already a senior in the industry with a big scrambler. It used to be a law-breaking ride. It was a circus motorcycle which was also used in Ek Duujey Ke Liye. It belonged to a stuntman friend. I used to borrow it and it was almost like my bike.
Did you have a rivalry?It was very stiff competition. Both of us came from the same guru, Mr Balachander. So, even if we had that look in our eyes, Mr Balachander would shout it down.

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Could you please explain to me what "big scrambler" means in this context?