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Old 04-28-09, 08:29 PM   #1
meech151 
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Fork rake

Anyone ride a bike with a fork rake of about 20-25mm? I am building a track frame and can only get about a 25mm offset without bending the fork blades and i am curious as to how this thing is going to ride. It has a 73 degree head tube angle. I posted this in the frame builders forum but there are more people in this forum and maybe more experience riding this style of bike. Thanks.
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Old 04-29-09, 02:03 AM   #2
andre nickatina
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73 is a little too slack with 25mm. That gives you 76mm of trail which is a bit too much - no one really needs that much trail. If you went for 75/25 and you'll be more in an acceptable range - 63mm trail which is a lot more like what you typically find on steel track bikes.
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Old 04-29-09, 04:32 AM   #3
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^agreed with AN. ~60mm of trail is considered a sweet spot of neutral handling. more trail (less rake) increases stability, less trail (more rake) decreases stability (toward "twitchiness").

don walker wrote a good bit in Urban Velo called The Truth About Track Geometry - might be a good read for you. http://www.urbanvelo.org/issue3/urbanvelo3_p44-45.html ... give it a read and see what you think.

Why don't you want to bend the fork blades?
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Old 04-29-09, 01:53 PM   #4
meech151 
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So you think this frame is gonna steer too slow correct? I thought with less rake it would steer a bit faster.
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Old 04-29-09, 02:15 PM   #5
andre nickatina
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The increased trail is going to make the bike handle more unstable (with more wheel flop) at slower speeds, and it will stable out at higher speeds. But here's the thing: NOBODY makes a bike with that much trail for on-road use. ****, I don't think anyone does that much trail for off-road either, I just can't positively say it as a fact. Anyways, it's not going to be an unrideable bike but it's not necessarily going to ride good. Try and find someone who has a trail measurement that big... 73 degree head tube nearly always calls for 37.5-45mm of rake. Track bikes are plenty stable in the upper 60's trail range. Either learn to curve the fork blades or buy a Reynolds Ouzo Pro track fork.
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Old 04-30-09, 07:18 AM   #6
Mike T.
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Quote:
Originally Posted by meech151 View Post
I thought with less rake it would steer a bit faster.
You need to read up on the relationship of Trail to Rake and their effects. Fact - less rake = more trail = "slower" handling. Head angle and wheel diameter being the same of course.
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