Spring rate is up to your personal preference but we have found that to lbs is a great starting point for most bikes up to lbs. Use a Pro-One bottom bearing race with stop tab Sold Separately and don't worry about drilling and tapping holes. Adjust both with very little effort and switch back again when you are ready! Accommodations for an internal fork stop have been provided. So I did a first prototype in wood to test some ideas.There are so many innovations on this stunning front end! Not satisfied with your rake? No problem! Same goes for the fork length. My girder retains that kind of feel with benefits. Another advantage is the natural balance the steering now has, a telescopic fork has most of its steered mass in front of the steering axis so its natural balance is to fall away from center, my girder fork has its steered mass behind the steering axis so its natural balance is to return to center and stay centered, that's gotta be good for stability and feel.Ī very important feel, one of the biggest advantages of a telefork is the direct feel it gives to the rider and as riders that's what we are used to. With that done I now designed and made the link setup with rearwards offset link pivots, the advantage of this design is it allows the use of very long links but still keeps the design very compact for good steering clearances and a very low steering inertia. I found the 04 R1 to be the best candidate for this type of modification, which was just a matter of cutting out the standard steering head and welding in a custom longer one. I chose a 16 degree steering rake angle and I was very confident of doing this because Tony Foale has long put forward the advantages of steep rake angles and these kinds of angles are commonplace in bicycles, from mountain bikes to road bikes, and to do this I needed to modify an existing frame to achieve this angle.
So how do I fix this? Very simply, steepen the rake angle so that the rake angle closely follows the wheel path and offset and trail remains more constant, it's not perfect but miles better than what has been before. Other designs like Hossack, center hub, etc. On teleforks the wheel moves in parallel with the steering axis and offset is fixed and so doesn't change, so trail doesn't change except with variations in rake angle. The reason is the wheel on a girder moves independently of the steering axis with a more vertical wheel path, this leads to an increase in steering offset which leads to trail loss and all the problems associated with very low trail. The girder's big weakness with this wheel path is massive trail loss when braking or when the suspension moves in general.
#Durfee girder front end for sale software#
Having mucked around with the FFE software I realized what the problem with girders was. This prototype taught me a lot of what I needed to know for the next step. I then built a rough prototype to test some ideas on geometry and construction, the bike I used was an FZR frame with a 98 CBR motor for extra go that I had built some time ago. The project began in late I was wondering why girder forks aren't seen on any sports and race bikes, Why is this so when girders have all the advantages of link type systems with antidive characteristics, low stiction etc.? I began by using Tony Foale's FFE suspension software to investigate the working dynamics of how girders function.
Laurie sent me some photos and explained how it all came about. He's pretty pleased with the result and thought readers of The Kneeslider might want to have a look. Of course, Laurie was in a better position than most of us to work out answers to his questions and the result is the bike you see here, a Yamaha R1 with his very own aluminum girder front suspension. Working on motorcycle forks, shocks and swingarms all day, it shouldn't be surprising he has a few of his own ideas about what comes between the wheels and frame and when he started thinking about why girder front suspensions weren't often found on sport bikes, he decided to look into it. Laurence Smith runs SuspensionSmith, a suspension business in Australia.
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