A literally indispensable component for Old School choppers is an extended Springer fork which until today was a major obstacle because you either had to cut and extend your stock fork (ouch!) or purchase one of those somewhat flimsy aftermarket springer forks. Nowadays, there are professional solutions and the Big Twin forks offered here feature one-piece, forged tubes for strength and safety, made just like the shorter versions.
- Feature a fork stem with two Ø1” bearing seats for the use of 1949-up tapered roller bearings without any modifications.
- With a positive rake, i.e. the steering stem is inclined to the front by 3°. This is done to avoid a steering neck so high and inclined that the bike is impossible to steer. We call these forks Offset +3°, according to their rake.
- Standard rockers limit fork travel on overlength forks so the 16” and 20” versions sport special longer rockers to maintain proper travel. They accept 19 mm axles for custom brake and wheel installation.
Length is measured from axle center line to seat of lower steering head bearing.
Although these Custom forks are intended for 1936-1957 rigid frame Big Twins they can be mounted with later frames, too, provided you have/install matching frame head beariings. The builder has to consider rake, trail, overall chassis geometry, brake function, etc.
1.) The pivot point of the brake shackle on the backing plate or caliper bracket must not be positioned vertically above or in front of the wheel axle (driving direction). In this case the moving forces in your fork parallelogram will be reversed and the fork will rebound instead of being compressed when you apply the brake. This will generate very high forces to impact on your rigid fork leg with possible damage.
2.) Caliper bracket or drum brake backing plate must float on the wheel axle. If not, the fork will rebound as well when applying the brake. Result: see above.
- fits Big Twins
- internal thread of neck post: 3/4”-14 UNS
- steel, black, powder-coated, chromed springs
- rake: 3 °
- with material certification
Internal Threads on the Upper End of the Legs
For custom riser installation the fork legs have M20x1.5 internal threads at the upper end and accept riser adapter studs or plugs which are available separately; an extra added by the manufacturer which saves you a lot of work and axle grease.
Inline vs. Offset
Classic Springer Forks are produced for different frame rakes.
- In the beginning, both the main tubes and the steering stem were in the same plane. This is called "inline". The rake is 0°. Of this type were all 45” Springer forks 1936-1957 and all Big Twin forks 1936-1945.
- From 1946 onwards the Big Twins had the neck angle increased to 30°. To maintain fork inclination and ground clearance, the steering stem was tilted to the rear by 3°. We call these forks Offset -3°, they were stock on 1946-1948 Big Twins.
- When building a bike with ≥+8” extra long forks you don’t want the steering neck so high and inclined that the bike is difficult to steer. Therefore such forks are manufactured with a positive rake, i.e. the steering stem is inclined to the front by 3°. We call these forks Offset +3°.
The sketch shows the placement of the lateral tubes and steering stem seen from the drivers place. Now it is clear, too, why there have to be three different types of top trees or handlebars for Classich Springer forks.
Chromed Springer Forks
Springer forks are pretty complex products which are still manufactured on old style machinery to period specs. They feature lots of tight bends, numerous connections and many hard-to-reach spots which simply cannot be polished to a mirror-like finish with resulting imperfect chrome surface.
Moreover, the applied welding and soldering techniques make the forks prone to oxidation in the aforementioned spots, if not attended regularly. Sometimes even new forks can already show light oxidation here.
To make a long story short: it´s a good idea to frequently apply a little WD40 into the dark corners of your fork, especially after wet rides or steam cleaning, in order to conserve your shiny chrome.
Keino Cycles Brackets for Springer Forks
Fork Clamps +3° Offset for ≥+8” Springer Forks
Bates Riser Adapters
Steering Damper Assemblies Springer Fork
Bike Station Shock Absorbers for Classic Springer Forks
Have any questions?
Our service team will be glad to help out: Mondays - Thursdays 08:00-17:00 CET, Fridays 08:00-16:00 CET, Phone: +49 / 931 250 61 16, eMail: email@example.com