550mm Rule

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JAC
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550mm Rule

Post by JAC » Fri May 25, 2012 1:50 pm

Can anyone tell me exactly where on the neck the measurement is taken from? Is it the centre top to bottom, front to back? It seriously is that close for me. If it where measured from the forward face of the neck I would be ok. Middle and rear face I'm forked.

Neo Dutch
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Re: 550mm Rule

Post by Neo Dutch » Fri May 25, 2012 2:02 pm

Basically the centre of mass of the steering stem to the centre of mass of the front axle measured on the horizontal plane.

The actual wording mentions the midpoint between the bearings.
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Aussiehard
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Re: 550mm Rule

Post by Aussiehard » Fri May 25, 2012 4:53 pm

Centre of the neck in terms of length and radius. There are plenty of diagrams and details available.

If you search my blog I have most the info post through out it, just don't mind the bitching about this being a nanny state and the 550 rule being ludicrous :roll:

Prof
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Re: 550mm Rule

Post by Prof » Fri May 25, 2012 8:55 pm

Replies are correct. You can get 3 degree offset headstem bearings for some bikes. They are commonly used to get by 550 rule.
Chopit'nrideit... Prof

JAC
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Re: 550mm Rule

Post by JAC » Sat May 26, 2012 5:27 am

Prof wrote:Replies are correct. You can get 3 degree offset headstem bearings for some bikes. They are commonly used to get by 550 rule.
A consequence of these is that they effectively "space" the trees off the neck right? I figured I buy the 3 degree neck cup bearings and put them in backwards. But figured that now there is more distance between the trees it will have had the effect of "shortening" the forks, which would drop the front end (of the frame below the legal height). Or maybe i'm just overthinking it?

These are the neck cups I would buy.

http://www.ebay.com/itm/120732484207?_t ... IT&vxp=mtr

Prof
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Re: 550mm Rule

Post by Prof » Sat May 26, 2012 11:25 am

Deraking your front end pulls the wheel backwards which raises your bike... should pretty well cancel any shortening out.

Once it's through inspection reverse them and get a bit more rake.
Chopit'nrideit... Prof

JAC
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Re: 550mm Rule

Post by JAC » Sat May 26, 2012 11:26 pm

Prof wrote:Deraking your front end pulls the wheel backwards which raises your bike... should pretty well cancel any shortening out.

Once it's through inspection reverse them and get a bit more rake.
Yeah figured I would take them out. Not sure I would put them The correct way to get more take, it's already very hard to steer at low speed.

Thanks for you help folks.

JC

Prof
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Re: 550mm Rule

Post by Prof » Sun May 27, 2012 6:57 pm

What degree rake do you currently have?
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JAC
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Re: 550mm Rule

Post by JAC » Sun May 27, 2012 10:14 pm

I rang the manufacturer and they said 38*. Is there a precise way of measuring?

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Re: 550mm Rule

Post by Neo Dutch » Mon May 28, 2012 10:56 am

Image
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Prof
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Re: 550mm Rule

Post by Prof » Mon May 28, 2012 9:55 pm

At 38 degrees it should not be hard to steer at low speed. Check that you don't have the headstem bearings too tight... that will cause you to weave. My shovel is 39 degrees and I can pull up at the traffic light with only one had on the bars. Adding rake does increase heaviness at low speed, but even at 45 degrees (my son's 550/5) it is not unpleasant and once above walking speed is not noticable... but fantastic at anything above that... very stable and relaxing to ride compared to a stock rake.

A 21" fornt wheel will cause more low speed flop for the same rake than a 19". A springer reduces trail and lightens up the steering at low speed.
Chopit'nrideit... Prof

JAC
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Re: 550mm Rule

Post by JAC » Tue May 29, 2012 10:12 am

40 it is then.....

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Tex
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Re: 550mm Rule

Post by Tex » Tue Jun 05, 2012 3:39 pm

Here's an interesting article on Rake & Trail.


http://www.chopperhandbook.com/rake.htm
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Tex
Tex
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