Have you ever wondered what the seat tube and head tube angles are on your vintage bike? Is the head tube angle off after that frontal impact?

Here are 2 quick, easy and cheap* ways to measure a frame.

* = cheap = ~$15 for the digital gauge from Harbor Frieght and $3 for the iphone app....assuming you already have the iphone.

Method 1 is using a digital angle gauge from Harbor Freight. Zero it on a level surface then place it on the frame tubes. The bike I'm measuring in the pics suffered a frontal impact and has rippled top and down tubes. As you can see the head tube is within reason. Because the frameset is in my workstand the actual number isnt relevant, whats relevant is the relationship between the numbers. If the head tube was more steep it would tell me its out of spec.



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Method 2 is using my iphone with an app store app. Idealy the face of the iphone should be agianst the tube as the backside has a slight curve....but you get the idea. For the iphone to be most accurate the 'Y' axis needs to be centered, as you can see I'm slightly off.