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Pushrod u still on here? Chop Block. Any info on girders is appreciated. Thx you. Sponsored Links. Register now for free! Advertising ClubChopper. I took off an SJP front end for theirs and the ride is actually smoother. Had seen your post on girders and have to say after using dozens of them that the Durfee's are one of the best out there.
Having been built since the early 70's actually i thing they started in 60's, now that i think about itthey've not only worked out all the mechanics but have the process down to as streamlined as anyone can have. Paul, the son of the founder is the current owner and he's done a great job in getting the product expanded and has worked with us in developing a wide glide version alsoas well as a square girder. The units features stronger and tighter tolerances by utilizing CNC machining and TIG welding chrome-moly seamless tubing.
Brake mounts are redesigned to use any H-D bolt pattern caliper with a Lengths are available from 2" shorter than stock to 18" over optional headlight and turn signal mounts. You can check out the various types on our storefront at www.
You wont' be dissapointed. You can see one of our last builds on the cover of December issue of Easy Rider magazine. The bike is called "Errant".
Good luck. My shovelhead still has the 16" over I put on 33 years ago, still rides like a new one and never been apart And now they are back in business once again Donnie SmithJake Robbins talks about his girder fork engineering business, and shares his insight into girder forks care, repairs, maintenance and manufacture. Jake Robbins - girder fork specialist. Telephone: Email: elkforks aol. Jake Robbins began his career as a girder fork engineer working with the late Steve Burniston, the man behind Elk Engineering.
Steve died inleaving Jake to continue the business which has gone from strength to strength. Now trading under his own name and operating from a workshop in Hastings, East Sussex, Jake explains some of the intricacies of the girder fork and shows how to maintain and get the very best from them.
My older brothers all had British motorcycles, while I had Italian machines mostly. It was when I began working with Steve. There were various jigs to be built and equipment to be sourced. But girder forks are my core business. I make front wheel spindles too where required. You need to watch the upper spindle areas and listen for any clicking. In fact, all it does it mask wear and it damages the side plates. There has to be a small clearance.
When forks have been abused like this, they need to be stripped and have the worn surfaces built up with weld. Your ears can tell you a lot if you just listen carefully. When I get a set of forks in for repair, I check them in a variety of ways. I look for squareness. I feel the tubes and lugs searching for damage. I give them a good rattle and listen for rust particles—or larger pieces—moving around inside.
I also inspect all threads and lugs—both of which are easier to repair effectively when the forks are off the bike. So take advantage of strip-downs and restorations. A breakage could, at worst, lead to a collapse and cause the front wheel or front mudguard to slam into the frame leading to a total loss of control. So always check the springs—especially with regard to the earlier Druid type forks that effectively hang on the spring.
A Brief History of Girder Forks
Cracks, for instance. Or severe pitting or rust. Or thinning areas—most likely at either end of the spring rather than in the centre. Check too for uneven coil widths and that the spring is compressing evenly and not skewing to one side. But it can happen. So check regularly.Home About Services Portfolio Contact.
For more information contact Paul Durfee at info durfees. It all started back in when Earl Durfee picked up an old Indian Scout Girder and knew he could do better. You see the better part was easy for Earl because of two big factors.
The Metallurgy and welding processes fields in which he had studied, worked-in and knew, had supplied him with the knowledge and tools to bring the girder design up-to-date. But even with the flaws, the good, far outweighed the bad because there are so many great things about girders, some ahead of their time, which convinced him that this was the way to go if you were after a good looking, incredibly strong, light weight and smooth riding motorcycle suspension.
His redesign also included four hidden, internal adjusters, that could be firmed up for fast riding or adjusted back for a smoother ride. The new design also added components for disk brakes so the end result was lighter, stronger, visually cleaner looking, and a more safe Girder that helped make the Durfee Girder the one to have and to ride.
Now that Earl had updated the classic and proven girder designs it was time to see how his new model worked. Being a Certified Aircraft Welder, he was familiar with and believed in the value of testing. The purpose of this organization was to test and certify their products through independent testing that would allow the builder and the various state vehicle inspection and licensing agencies to know that this was a safe product.
Purple Haze: A Chopper Profile
The Structural Test Machine was the first project commissioned by this new organization. The NCCSI test machine was a sadistic monster that used a 4 foot diameter steel wheel with bolted-on metal plates that can vary in size to simulate a road expansion joint all the way up to a huge pothole in the road. The wheel was powered to rotate from a crawl up to about MPH.
The front end is bolted into an adjustable, hydraulic neck that can simulate any rake and be rotated to mimic any curve that a motorcycle might lean into. Sensors on the tested part measure the forces at different points and strobe lights allow you to turn what is a blur of crashing metal into slow motion or can even completely stop the motion to see what is happening at any place on the front end. That any fork can stay whole through the test is a minor wonder to me.
The Durfee Girder would take the normal 24 hour run, at resonate frequency, easily as part of the hour complete test.
And after all that repeated beating, way past what the test required, when the Girder was torn down and inspected there was only mild wear on the replaceable pivot shafts! Along with Walt Jaquith and Rick Anderson.
Paul Durfee who has helped build the Durfee Girders sincecompleted another mild redesign in resulting in an even stronger, better built, and better looking suspension, that can accept todays larger hubs, wheels and and dual-disc brakes. Currently Paul, Walt, Rick and Paul's brother Mark Durfee are in the process of designing several new, completely different kinds of "girders" that we hope to let you know about soon.
Site powered by Weebly.If this is your first visit, be sure to check out the FAQ by clicking the link above. You may have to register before you can post: click the register link above to proceed. To start viewing messages, select the forum that you want to visit from the selection below. Page 1 of 2 1 2 Jump to page:. Content on this page requires a newer version of Adobe Flash Player. Im startin to feel a hankerin fer a girrder so lets compile a thread of some of the best lookin girder front bikes out there, with a little bit of tech in there.
How do they handle? When building one prefer tube or solid stock for the legs? Headlight mounting options? This is big for me it seems the only downfall to them is trying to get a decent looking light setup that doesnt make the front look overly cluttered.
And go! Looks good and wouldnt mind finding out what happened with this bike getting done. I really like the simplicity of the whole setup. The headlight Setup wasn't a big deal for me The legs are solid and I prefer the single spring over a shock in looks and in maintenance.
I'll have to get back to you on that. No headlight mount yet. Attached Thumbnails. Bike looks sick rob. I must have stolen your pic. Came a long way man, any build links? Originally Posted by pancake. Some folks have told me it's a solid bar, but I have no way of confirming.
I like how the headlight is mounted, don't really know how to answer that because everyone's got their own style. Love the girder. I'd build all my bikes with girders if I could. Harman "spirder" internal sprung girder. Originally Posted by britbikebomber.Back when girder forks were status quo, various types were tried and developed.
With most following the same basic principals, they were, not surprisingly, very similar in design. The types of girder forks found on motorcycles fall broadly into two main categories: parallelogram and leading link. Probably the earliest example of the parallelogram type is the Druid, patented posthumously in by the estate of one Arthur Drew.
Druid forks are recognizable as looking like a bicycle fork with a strengthening brace at the front and a couple of coil springs behind. Though some models included rebound springs, there was typically no provision for damping. Most popular in terms of usage on pre-WWII British motorcycles was the Webb fork, which again used a parallelogram linkage to allow for suspension travel, usually controlled by a large central spring.
Advantages over the Druid included the option of a rotary friction damper and tapered coil springs for progressive compression. Whether Mr. Webb ever made any money from his invention is unlikely, as just about every British motorcycle manufacturer built its own fork following the basic Webb design. The Brampton fork, later fitted to Vincents, was similar in concept to the Webb.
The leading-link fork fitted to Harley-Davidsons carried the front wheel axle ahead of the spring leg, which slid against a coil spring carried in the main fork. The British Castle fork fitted to the Brough Superior closely followed the Harley design, but added large rotary friction dampers. Though not fitting into either category, Triumph fitted some of their s motorcycles with a girder fork that paired a hinged lower link and a slider at the top, meaning the fork would move backward and forward during compression, altering the steering geometry.
My father rode a cc Triumph so equipped in the early s and declared it to be an evil handling bike. He traded it for a cc BSA — but not before the Triumph had twice pitched him off!
Bushings wear over time and may need to be replaced, especially if maintenance has been neglected. Spindles are made of special steels, and only replacements designed for fork applications should be used. Regularly inspect fork legs for cracks and signs of rust. Many manufacturers produced forks using different size tubing for different applications.
Join us for guided rides, a swap meet, bike shows, mechanical workshops, woods races, social events, and more! Motorcycle Classics is America's premier magazine for collectors and enthusiasts, dreamers and restorers, newcomers and life long motorheads who love the sound and the beauty of classic bikes. Where it all began: Druid fork as fitted to a Ariel.
Vincent Brampton fork.
Vincent Girdraulic fork. Brough Castle fork. Harley-Davidson leading-link fork. Continue Reading. Share your thoughts. Related Content. Eye Candy Print.Eric at Toxic Choppers is doing the bike build. I had spoken with Paul before on other customer projects before and knew he was a pretty cool dude.
So, I called him and expressed my concerns. He asked me a few questions and said he would get back to me in a couple of days. Well a couple of hours later he emailed these CAD drawings. This is totally awesome. Eric did a great job at getting us in the ball park but, Paul hit a home run. Now I can build the frame in confidence knowing the final outcome.
So Lucas. Take your pick. The moral of the story is Paul Durfee is the man. Filed under Durfee Girder. You are commenting using your WordPress. You are commenting using your Google account. You are commenting using your Twitter account. You are commenting using your Facebook account. Notify me of new comments via email.
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What's New? Last Jump to page: Results 1 to 10 of Thread: Springer vs Girder Forks.What It's All About: My Girder Front-End
Springer vs Girder Forks Some people do not recognize the differenece between a set of Springer forks and a set of Girder forks. To in very simple terms: Springer forksoften used on older Harley motorcycles, have 2 sets of legs on either side.
The rear set should not move, and the front set moves up and down with the road surface. The Springer forks pivot on the small rockers on the bottom and use a series of springs at the top for suspension. Girder forksoften used on Indians and some aftermarket choppers, use one set of fork legs that move up and down with the road surface and use a set of parrallel arms and springs at the top by the steering head for suspension.
Anyone out there with a better description - please chime in. Join Date Oct Posts Thanks for the info. I think this would be better if we added some phoos or drawings to show what you are explaining better. Here is a girder fork, and Ride your motorcycle like you stole it.
Classic Harley magazine. Join Date Jan Posts This is U. Indian Chiefs,Scouts, and Harley springers are all girder forks. I suspect but don't know for sure that the different references may have started with the early days of the chopper craze,the same way that people started calling any foot clutch a "suicide clutch"whether it was spring loaded or not. Any real Old Timers know? Since "girder" is actually a term for a structural design shape used in building construction, and since the legs of a girder front fork bear a striking similarity to that design, I would then have to surmise that the term derived from a generalization of the actual shape of the part, and really nothing more.
Don't try to blame it on the 60's hippy-bikers, or we'll come after ya! Posts 7, Originally Posted by Tom Sarge, Gerry Lyons, Fla. So far.
The Friendly Fire that Keeps on Burnin'. Here's a photo of the Indian Chief fork Sarge talks about. It has a leaf spring, a trailing link, and a girder-looking fixed fork leg.
This is one of a bunch of fine bikes on display Sunday in Anacortes, Wash. I'll post more pictures in the next couple of days. Walt 32V