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Singlespeed & Fixed Gear "I still feel that variable gears are only for people over forty-five. Isn't it better to triumph by the strength of your muscles than by the artifice of a derailer? We are getting soft...As for me, give me a fixed gear!"-- Henri Desgrange (31 January 1865 - 16 August 1940)

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Old 03-21-07, 02:22 PM   #1
cycliques
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Where are frame geometry angels taken from?

Hello everyone,

Newly minted member here.

Just wondering where the angle measurements are taken from when describing frame geometry. Example: A 75 degree head tube. It can't be the angle on the inside of the tt and ht because its obtuse. Is the angle measured by imagining the tt passing through the head tube and measuring the angle on the other side? ie: the supplementary angle to the obtuse angle?

Thanks
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Old 03-21-07, 02:25 PM   #2
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most bike manufacturers have a diagram with the geometry specs they list.

Last edited by dutret; 03-21-07 at 02:30 PM.
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Old 03-21-07, 02:29 PM   #3
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75 degrees between the headtube and horizontal
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Old 03-21-07, 02:30 PM   #4
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uhhhhh yeah what was I thinking
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Old 03-21-07, 03:11 PM   #5
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heaven of course!
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Old 03-21-07, 03:25 PM   #6
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Thats what I figured, thanks.
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Old 03-21-07, 03:57 PM   #7
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heaven of course!
nice catch.
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Old 03-21-07, 03:59 PM   #8
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heaven of course!

Or Hell, depending on what kind of angels we're talking about
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Old 03-21-07, 04:13 PM   #9
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Quote:
Originally Posted by cycliques
Hello everyone,

Newly minted member here.

Just wondering where the angle measurements are taken from when describing frame geometry. Example: A 75 degree head tube. It can't be the angle on the inside of the tt and ht because its obtuse. Is the angle measured by imagining the tt passing through the head tube and measuring the angle on the other side? ie: the supplementary angle to the obtuse angle?

Thanks

can you really not figure this out all by yourself?
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Old 03-21-07, 04:18 PM   #10
12XU
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can you really not figure this out all by yourself?
Somebody stole his protractor! Give him a brake...
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Old 03-21-07, 05:01 PM   #11
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Somebody stole his protractor! Give him a brake...
WINNER!
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Old 03-22-07, 10:51 AM   #12
cycliques
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can you really not figure this out all by yourself?

Just looking for confirmation, man.
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Old 03-22-07, 11:03 AM   #13
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Somebody stole his protractor! Give him a brake...
a BRAKE?

ummmmm.....Brakes are bad........mmmmkay
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