Checking rear triangle & drop-out alignment.
12-14-11, 12:08 PM
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Checking rear triangle & drop-out alignment.
I have a steel touring frame with 130mm drop-outs. The frame is 4130 steel, made by Fuji in China.
How can I inspect for correct alignment before I start building this bike?
How can I inspect for correct alignment before I start building this bike?
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12-14-11, 12:12 PM
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Use a ***, otherwise known as a Frame Alignment Gauge.
https://www.parktool.com/product/fram...nt-gauge-***-2
You may as well check the derailleur hanger alignment while you're at it.
https://www.parktool.com/product/dera...nt-gauge-dag-2
https://www.parktool.com/product/fram...nt-gauge-***-2
You may as well check the derailleur hanger alignment while you're at it.
https://www.parktool.com/product/dera...nt-gauge-dag-2
12-14-11, 12:13 PM
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Pardon me while I step out to smoke a ***.
12-14-11, 12:17 PM
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F.A.G = Frame Alignment Tool.
How about the string method, a waste of time? How is it done?
How about the string method, a waste of time? How is it done?
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When I ride my bike I feel free and happy and strong. I'm liberated from the usual nonsense of day to day life. Solid, dependable, silent, my bike is my horse, my fighter jet, my island, my friend. Together we will conquer that hill and thereafter the world.
When I ride my bike I feel free and happy and strong. I'm liberated from the usual nonsense of day to day life. Solid, dependable, silent, my bike is my horse, my fighter jet, my island, my friend. Together we will conquer that hill and thereafter the world.
12-14-11, 12:23 PM
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https://sheldonbrown.com/frame-spacing.html
String Method is adequate for checking the rear triangle. Will need the F.A.G. for the dropouts.
From Sheldon's website:
String Method is adequate for checking the rear triangle. Will need the F.A.G. for the dropouts.
From Sheldon's website:
- Tie a piece of string to one rear fork end so that the string runs along the outside of the fork end.
- Run the string around the front of the head tube and back to the other rear fork end.
- Pull the string taut, making sure that it's contacting the same part of each fork end.
- Use a ruler to measure the distance from the string to the side of the seat tube where they cross. Take this measurement on both sides, it should be the same on each side.
- If the spacing is as desired, and the string test is correct, you're almost done. If not, you'll need to go back to levering with the lumber to correct any error.
- If you find that you've over-corrected on one side or the other, the same basic approach can be used, except that you lay the bike down so that the stays that are too far out are facing down. Run the lumber under the bottom fork end, and, again, over the seat tube, then press down as before.
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