Linkage bike suspension simulation software

There are 1910 files in the bike library now.

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Linkage Manual

Frequently asked questions

On what operation systems does Linkage run, is there a Mac or Linux version?
Linkage runs on Windows from XP to the latest versions (Windows 7,8,10 etc.). There is no Mac version, though it's working fine with an emulator, we tried it on Parallels Desktop. Also it works under Crossover and possibly on Wine. Or, if you set up a Windows Virtual Machine on any OS, it will work. Though please try the Linkage demo first to be sure.
Windows XP users or other emulated platform users may experience drawing/graphics problems, please write if you experience problems, and we try to provide a fully compatible version.
I have a laptop and a desktop computer. Should I buy two licenses?
For the Personal version one license is OK, if it's really only you using the software (you are granted 2 computer installations by default). For the Professional version please buy license extension(s) to use it on more workstations. Please contact info@bikechecker.com if you got your computer crashed and have a fresh operation system installed and you can't install Linkage on it.
In what languages is the software available in?
In alphabetical order: Czech, English, French, Hungarian, Italian, Spanish, Romanian, Russian, Slovak and Traditional and Simplified Chinese. The help is only available in English and Italian (a bit outdated).
If you find translation errors or you are interested in translation to other language(s), please contact info@bikechecker.com. We usually offer a full software license in return, or let us know what you would like.
The Linkage staff thanks all the translators their great work.
Could you please model the bike ABC ? (substitute ABC with an actual bike model)
The best place for asking a question like this is the Forum. Maybe someone will listen and upload a file for the desired bike. Or you can create your own model, all you need is a good sideview picture, with possibly no perspective distortion - use telephoto on your camera and focus on the middle of the rear part, looking straight, not sideways and not from above. Then click on "New" and open the photo and click on the points the software asks for.
How can I make a file that's as accurate as possible?
You have two ways in Linkage to make a new model. Either you make a side-view picture of the bike and after pressing "New" you load it and click on the points the software asks for. When you're finished with points, you can draw the outlines (polygons) of the frame to make it look better. To make an accurate model, you should make a photo which is exactly sideways (perpendicular to frame), have no perspective/barrel distortion (telephoto is better). It's hard to achieve, but if you can measure your bike you can modify pivot coordinates/bike geometry later. The other way to create models is to start from templates, Linkage has now 21 built-in frame types to choose from, which covers about 99% percent of the bikes available. After creating a bike from a template you can modify every point, draw outlines, modify shock, fork, wheel parameters etc. You can also change frame type (ie. single pivot, 4-bar etc.) any time.
I have a special bike idea, can I draw it in Linkage?
Probably you can, but keep in mind that it only supports specific frame arrangements from single pivot frames to (real) six-bars, including MacPherson strut and linear slider equipped suspensions. It does not calculate frames with two shocks or frames with flexible parts. Flexible parts are usually substituted with a pivot at the thinnest part of the element.
Can I model 650B or any size wheels?
Yes, just type the size into the wheel size fields. You can enter for example "27x1.5". If you rest the mouse over the input field, it will show the inner and outer actual diameters in the measure unit you selected. Also you can use exact diameter input like 705/584 or 60-584 tyre size style too.
Do you support "Trunion" mount shocks and pull-shocks?
Yes. Pull shock can be checked as an option. Trunion style shocks are basically short eye-to-eye shock with big travel relative to the eye-to-eye distance. So you can set it up as a short shock, just please ignore that the software won't display the part of the shock beyond the trunion mount.
How do you set up shock-yokes?
Keep in mind that shock-yokes or extensions are basically doing nothing different regarding kinematic calculations. They simply elongate your shock without adding to the possible stroke. For display correctness though you can set Shock-yoke length in Linkage, so it will look similar your real bike.
What does the air shock parameters mean and how to set them up?
The parameters model a shock with a positive and a negative chamber, the positive being simple cylinder shaped and the negative chamber being a thick walled "pipe" shape with inner and outer diameters. The actual sizes for a real shock are hard to tell since these are not publicly available and their chamber shapes may be different - or utilizing a special elastomer negative spring for example. Recently we added the feature of setting up the air chambers by entering volumes only. Also, initial negative air pressure is auto-calculated for zero position balance.
After all you either measure your shock or use an estimate, or load a predefined shock force curve from a spreadheet csv file if you have access to data / shock force measurement device. You can download an example data file here.
Can I fix shock the stroke?
Yes there is the possibility to fix it after entering shock stroke value at the shock parameters. So the software will always refresh the maximum travel according to shock stroke. Just check "Fixed" below the shock stroke field. You can also check "Fixed" for shock length which will keep it constant when dragging the endpoints of the shock with the mouse.
What does anti-squat and anti-rise mean?
They show a percentage of how the acceleration, deceleration affects the suspension movement. It is based on a graphical methods that is also used to determine car and motorbike acceleration/braking response. Now these methods are in common knowledge, but the chain drive anti-squat method was probably first used by DW-Link designer Dave Weagle. Please also visit the I-Track Suspension website for a whole lot of useful info.
While we think the methods are theoretically correct, it is possible that the real world results differ a bit. The center of gravity height is essential to be set up right. Also, it does not include the lifting/compression of the front suspension while accelerating or braking.
Update: The cooperation with I-Track suspension added the possibility to calculate anti-squat for frames with an idler (chain guide).
Note that the diagrams use a stationary main frame, while the values displayed in the current values panel always show the drawn position's values, so they change with either rear/front suspension movement (with the main frame potentially tilting a a few degrees clockwise/counter clockwise).