Actually There are definitely trucks 7.65. Get those they are the closest.
Buy 7.5 that will only be a 1/8 of an inch smaller which would mean 1/16 of an inch on either side which would not be noticable at all. I hope that this helps
51mm
yes you can
8.000
7.75 by 31
You should get a 7.75x3.15
You should always have the same size trucks
around 51mm-55mm, personally i would go for the 53's because that is in the middle
The smallest skateboard size is about 7 inches in width by about 24 inches in length. The skateboard is legal size for contests and events.
7.75
If you street skate then you should get a 7.75 but if you are more of a vert person you should at least get a 8.
8.0
Doesn't matter