Custom Motorcycle Building
Springer, Girder or Telescopic: Choosing a Front End for a Custom Bike
Springer, girder or telescopic? How each front end works, where it is used, brake dive, and what to settle with your builder before you order a fork.
The three front ends differ in how they hold the wheel and where the springs sit. A telescopic fork hides springs and damper inside two tubes and is the most common type. A springer is an early leading-link design with external springs, still found on choppers. A girder uses a pair of uprights linked to the triple clamp, with a spring between the clamps.
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Key takeaways- Telescopic: springs and damper inside the fork tubes; the common choice on mainstream street bikes since the 1970s.- Springer: external springs, two parallel sets of legs, found on antique bikes and choppers.- Girder: one of the earliest types of motorcycle front suspension.- Brake dive affects telescopic forks, and Wikipedia says an Ariel girder fork is as prone to it.
The three front ends side by side
| Column 1 | Telescopic | Springer | Girder |
|---|---|---|---|
| How it works | Fork tubes hold coil springs and damper inside | Rear leg fixed to the bottom triple clamp, a short leading link holds the wheel and the front leg works the springs | Uprights attach to the triple clamp through linkages; the wheel is fixed to the upright; spring usually between top and bottom clamps |
| Where you see it | Standard on mainstream street bikes since the 1970s | Antique motorcycles and choppers; the Harley-Davidson Softail Springer still uses one | Early motorcycles; Vincent's hydraulically damped Girdraulics from 1948 were the peak of the design |
| Look | Visually clean | Used on antique bikes and choppers | Early-bike look |
| Known drawback in the source | Brake dive under braking | The source lists none | Source says an Ariel Ace girder is as prone to brake dive as a telescopic, but claims better resistance to twisting |
How each choice affects the look
A springer or girder tells people the bike is vintage or chopper-inspired, because those designs belong to early bikes and choppers. A telescopic fork looks neutral and fits most street bikes. If you are weighing the look of a whole chopper build, our page on what a chopper motorcycle is lists the parts that usually go together.
Handling and braking
Every front end trades something. The Wikipedia fork article names brake dive for telescopic forks and says the Ariel girder is as prone to it. Geometry matters too: rake and trail are the numbers that shape how a bike steers. A different fork changes both. Ask your frame builder to agree rake and trail in writing before you buy a fork; how to choose a frame builder explains what to ask.
Upkeep
This page has no sourced upkeep figures for springer or girder forks.
Is it legal?
Rules sit with your state, not with the fork type. North Dakota is one example: Wikipedia quotes its rules limiting rake to 20 to 45 degrees and trail to 2 to 14 inches (5.08 to 35.56 cm) for motorcycles other than three-wheelers. Check the current statute for your state before you build; this figure comes from a secondary source and needs confirming.
Which front end suits which build
- Tidy street bike, long daily rides: the telescopic fork is the common choice on mainstream street bikes.
- Chopper or vintage look: springer or girder.
- Not sure: ask the builder to show finished bikes with each type being ridden.
For the process of putting a bike together, see how a custom motorcycle build comes together. For the paint stage, see how to custom paint a motorcycle, and for more styles see design ideas and examples. Unfamiliar terms are in the builder's glossary.
Riding gear
Leather Collection's motorcycle jackets come in race, touring, vented, street and semi styles, hand-stitched and made to order, with a Custom Size option.
FAQ
What is a springer fork?
An early leading-link fork with external springs, found on antique motorcycles and choppers.
What is the difference between a girder and a springer?
A springer has two parallel sets of legs, which tells it apart from a girder. A girder uses a pair of uprights with linkages and a spring between the clamps.
Are girder forks better than telescopic forks?
Wikipedia says the Ariel Ace girder is as prone to brake dive as a telescopic fork, though claimed to resist twisting better.
RDUKE Editorial Team
RDUKE articles are researched from published sources, cited in the text, and reviewed before publication.