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Head tube angle/increased fork travel



 
 
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  #1  
Old June 26th 03, 04:11 AM
Alan McClure
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Default Head tube angle/increased fork travel

Alright, my bike currently has a 70mm head tube angle with 63 mm travel on
the fork. I mentioned in another thread that I was thinking about getting a
new fork like this one:

http://makeashorterlink.com/?J2BC12E05

or another 80mm travel fork (any suggestions for a nice price--marzocchi
maybe). Anyway, someone mentioned that most people find 71 degrees to be
about right for the head tube angle. Of course, mine is already off that
mark by 1 degree. Does anyone know how much the above fork would throw off
the angle even more? Is there any way at all to counteract that effect
without having a frame builder replace the head tube. If not, then does
anyone have any other suggestions?

Thanks again,

Alan McClure



  #2  
Old June 26th 03, 07:03 AM
Mark Hickey
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Default Head tube angle/increased fork travel

"Alan McClure" wrote:

Alright, my bike currently has a 70mm head tube angle with 63 mm travel on
the fork. I mentioned in another thread that I was thinking about getting a
new fork like this one:

http://makeashorterlink.com/?J2BC12E05

or another 80mm travel fork (any suggestions for a nice price--marzocchi
maybe). Anyway, someone mentioned that most people find 71 degrees to be
about right for the head tube angle. Of course, mine is already off that
mark by 1 degree. Does anyone know how much the above fork would throw off
the angle even more? Is there any way at all to counteract that effect
without having a frame builder replace the head tube. If not, then does
anyone have any other suggestions?


The change from a 63 to 80mm shock (assuming the ride height will
change by ~15mm once sag is factored in) will be between close to
another degree (probably about 0.7-8 degrees, depending on a lot of
minor things like wheelbase).

That would put your head tube's effective angle at 69 degrees - pretty
slack, but not horribly so. I doubt you'll find the difference all
that drastic though. If it's a stiffer, better fork the result will
be worth it.

Mark Hickey
Habanero Cycles
http://www.habcycles.com
Home of the $695 ti frame
  #3  
Old June 27th 03, 01:28 AM
SuperSlinky
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Default Head tube angle/increased fork travel

Alan McClure said...

Alright, my bike currently has a 70mm head tube angle with 63 mm travel on
the fork. I mentioned in another thread that I was thinking about getting a
new fork like this one:

http://makeashorterlink.com/?J2BC12E05

or another 80mm travel fork (any suggestions for a nice price--marzocchi
maybe). Anyway, someone mentioned that most people find 71 degrees to be
about right for the head tube angle. Of course, mine is already off that
mark by 1 degree. Does anyone know how much the above fork would throw off
the angle even more? Is there any way at all to counteract that effect
without having a frame builder replace the head tube. If not, then does
anyone have any other suggestions?

Thanks again,

Alan McClure


I just went from 80mm travel to 125mm travel when I installed my Fox
Vanilla fork and I love the geometry change. One reason I bought the Fox
was that it converts between 80, 100, and 125mm travel. I figured that I
would have to knock it down to 80 to get good handling, but now I see no
reason to bother with it. When I was having problems with my stock 80mm
fork, I talked with the guy who designed the bike and he said that they
run them at 105mm all the time and they feel great. This conversation
came up when I arranged to trade up my defective 80mm fork for a Duke SL
U-Turn which has a travel range of 63-105mm. My experience agrees with
his. I do have the sag set to the maximum recommended, and I may find
out that there may be times when less travel would be better, like on
challenging uphills, but there are advantages and disadvantages to
everything. It's all a matter of taste, and the differences can be
subtle. I don't think you should lose any sleep over the difference
between a 63 and 80mm fork.
 




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