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 Post subject: highly tech quest.
PostPosted: Thu Nov 04, 2010 1:24 am 
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hello. if i had a frame with a head angle of 67 degree's with a fork of 160mm travel. if i changed the fork to one with a 140mm travel what would happen/would i notice it. thanks for any thoughts..


Last edited by hesdownagain on Thu Nov 04, 2010 4:47 pm, edited 1 time in total.

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PostPosted: Thu Nov 04, 2010 10:14 am 
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Run your current figures through this geometry calculator then adjust the fork length to your proposed and it will showyou the affect on then stock angles and bb height etc

http://bikegeo.muha.cc/.

Hope this helps


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PostPosted: Thu Nov 04, 2010 4:43 pm 
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thanks for the chart. trouble is i have no idea what it means.i wanted to know if it would affect the ride. i know people do it the other way and increase the forks to a better travel. thanks.


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PostPosted: Thu Nov 04, 2010 4:55 pm 
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Well its better to know how much you are going to affect the geometery.

However in simple terms reducing the travel will mean a shorter axel to crown length for the fork. This will make the bike faster steering and more responsive to steering input, but to much will make handling overly twitchy.

I am pretty sure its going to lower your bb height so can cause ground clearance issues and increase the chances of pedal strike and possibly toe overlap issues with the front wheel.

I think for rule of thumb reducing/increasing a2c length by 20 - 25mm will create a 1 degree change in head angle.


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PostPosted: Thu Nov 04, 2010 5:17 pm 
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ok. thanks for the help.i had no idea about the B/B being affected, something to think about. thanks again.. :lol:


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PostPosted: Thu Nov 04, 2010 8:29 pm 
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You'll definitely notice a small difference, but I wouldn't have thought 160-140 would be enough to make a mess of anything, after you factor in a bit of sag :D

68 degrees is still pretty slack! :lol:


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PostPosted: Thu Nov 04, 2010 9:27 pm 
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elPedro666 wrote:
You'll definitely notice a small difference, but I wouldn't have thought 160-140 would be enough to make a mess of anything, after you factor in a bit of sag :D

68 degrees is still pretty slack! :lol:
This is what i wanted to hear, that i may not even notice the difference. thanks for the input.. :)


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