A faster LEGO RCX line follower - V2

I made some modifications with the gear sets and the tire positions to make my robot much faster than the previous one and also little stronger.

watch the line follower V2 here - https://youtu.be/mTh1pjq7Kqo

While I was recording the robot lost the line and started to follow the edges of the RCX test pad(it is true that all great things happen by mistake XD) ... https://www.youtube.com/watch?v=mTh1pjq7Kqo