Animated GIFs

Thanks for your help with creating 6 animated GIFs from MP4 files.

Here are the MP4s: https://1drv.ms/f/s!AvbL9CfBrDzvhLoEaT2P9yx3aW92sA

Examples of existing GIFs from:
https://triggerbell.com/trigger-bell-compatibility/

https://triggerbell.com/wp-content/uploads/Trigger-Bell-Bike-Bell-Animated-Drops-1.gif
https://triggerbell.com/wp-content/uploads/Trigger-Bell-Bike-Bell-Animated-Hoods-1.gif
https://triggerbell.com/wp-content/uploads/Trigger-Bell-Bike-Bell-Animated-Integrated-Gears-And-Brakes-1.gif

Requirements:
Improved colour please - like the existing GIFs
Existing GIFs (examples below) are 500k in size. Something smaller would be better.
Smooth infinite looping
White background
Rotate bars so that they are horizontal (picture provided as an example) for:
a) Fixed Gear and No Gear
b) Drops with Combined Brake Gear
c) Drops with No Gears on the Drops
d) Drops with No Gears on the Hoods


The file "Drops with No Gears on the Hoods v0 02": The loop here might be a challenge. The thumb starts on the bike bell hammer, but ends with it off. Can you please fill in the frames so that my thumb moves back onto the hammer. This will make the loop smooth.

Thanks
Stef