Bike Forums - Good tools for measuring frame geometry

Quote:

Originally Posted by repechage (Post 13554638)

I made up some hardwood slides that fit over an 80x20 alloy extrusion with axles. I am not crazy with the tires on the ground, I would go bare rims if the bike was together.
Referencing off the axle centers will give the best info though in my mind and is how a framebuilder would replicate a bike.
The little digital angle finder is a nice one it appears, small enough, most are not, I had to use a 1/2/3 block to offset mine for the head tube.
IF the axle plane or base plane is level then the angle measures will be good. the fork can be arrived at without taking it apart, but I appreciate the element accuracy.
I think noting bottom bracket drop is important.
One thing not to do is assume that the top tube is level, it more than not isn't.
For measuring top tube ctc length I place some masking tape on the joints and draw the intersections out.

+1.

I fabricated some brackets for the front and rear dropouts that get the axle centers the same height above whatever flat surface you're using, and high enough so that the BB shell clears the surface, assuming the BB drop isn't more than ~100mm.