How to Create a Downhill Ski-Bike 2.0




介绍: How to Create a Downhill Ski-Bike 2.0

About: I'm an engineer who loves to solve problems by creating new products and finding useful ways to improve existing products. I like working in many different disciplines which helps me learn new skills and conti…


My first attempt at creating a downhill ski-bike resulted in a fully functioning prototype and was overall, a success. It performed as I suspected it would. The ride blended attributes of skiing, snowboarding and biking to great effect. You can find a link to my first iteration here:How to Create a Downhill Ski-bike

Despite the first ski-bike's admiral performance, test riding it revealed there were opportunities for improvement so I developed several design specifications and characteristics that would improve the ski-bike's durability, performance and ease of use. This Instructable chronicles the design improvements and changes that I made to create my second downhill ski-bike. Each step focuses on a specific attribute that I improved.

To avoid creating confusion, from this point forward I will refer to the first ski-bike as Ski-bike 1.0 and the ski-bike created in this article as Ski-bike 2.0.

Step 1: Bike Frame

After a few of my friends rode Ski-bike 1.0, it was apparent that the size of the bicycle frame was too large for most riders. The extra large frame was heavier than the riders were used to and more difficult to maneuver. The shock on the bike frame was also designed for larger riders so smaller riders were not able to fully utilize all of the shock absorbing advantages.

For these reasons, I chose to use a small sized mountain bike frame for Ski-bike 2.0. This would allow smaller riders to be more comfortable with the points of contact, and larger riders to ride the bike with few, if any, trade-offs.

There were two features of the bike frame from Ski-bike 1.0 that I wanted to keep the same. The first was to utilize a suspension driven frame and the second was to have an aluminum frame for it's excellent strength to weight ratio.


Ski-Bike 2.0的首要任务是设计和构建钢的安装支架,以实现最大的刚性和耐用性。

For Ski-bike 1.0, I lowered the axle height from the typical 13 inches for a mountain bike to 11 inches in order to lower the center of gravity and improve handling. The modification was effective so I expanded on that strategy for Ski-bike 2.0 by designing the axle height to be 9 inches.

Building the mounting bracket was a five step process:

  1. 将角度熨斗和管钢切割成我的设计预定的长度。

  2. Weld the pieces together.

  3. 构建轮毂和轴组件。

  4. Drill holes in the angle iron to line up with the ski binding screw holes.

  5. 钻在支架前面的孔中的孔螺栓(稍后讨论)。

创建一个基本的枢纽和轴系统,我用圣andard 3/8 inch threaded rod as the axle and purchased plastic bushings (from the retailerIgus) to provide a low friction barrier between the axle and the outer steel sleeve. The internal diameter of the bushing was chosen to match the axle and the internal diameter of the outer steel sleeve was chosen to match the outer diameter of the bushing. This resulted in a free rotating axle with very little unwanted play. I also added lock nuts to the front and rear axles to control the longitudinal pressure exerted on the hub delivered by tightening the outer bolts over the dropouts.

Step 3: Ski Type

As I demonstrated with Ski-bike 1.0, a set of downhill skis cut down in size did work to build a functioning ski-bike, but there were some serious drawbacks. Since I shortened the ski length, I couldn't use the ski binding screw holes so I had to drill long wood screws up through the bottom of the ski to attach the mounting bracket. This method was not secure enough for extreme or long-term use. Another drawback was that the ski could break open or separate on the cut steel edge, ruining its performance, and becoming a safety risk.


The width of the skis was also a factor to consider. Despite being similar in width, I could immediately tell a difference in the performance of my chopped downhill skis on Ski-bike 1.0 and my slightly wider ski blades on Ski-bike 2.0. The extra width increases the amount of leaning needed to catch the ski's edge and carve through the snow. One is not necessarily better than the other; it comes down to the rider's preference.

Step 4: Fork Travel


叉旅行- The amount the suspension fork can compress. The larger the amount of suspension travel, the longer the fork is.

头管角度- The angle the center line of the head tube makes with the horizontal plane. A steeper head tube angle will steer a bike more quickly whereas a slacker head tube angle makes it easier for a bike to travel in a straight line. Head tube angles range from about 66 degrees (downhill mountain bikes) to 74 degrees (race orientated road bikes).

在其作为普通山地自行车的日子里,Ski-Bike 2.0框架有一个带有100毫米行程的叉子。将其转换为滑雪自行车2.0时,我将原始叉形取代为130毫米的旅行。130毫米叉的行进比100mm叉30毫米,因此更长。这种长度的增加升高了头管,减少了头管角,当指向下坡时,使给我更自信的转向和控制。

The amount of fork travel paired with the height of the front and rear axles (based on the mounting bracket dimensions) determines the head tube angle. This in turn affects the steering and handling of a ski-bike. Since every bike frame comes in several sizes and has a different geometry, I can't say that there is a single, optimal amount of fork travel for all ski-bikes. It comes down to personal preference of the rider and the terrain.


I really liked the footing setup I used for Ski-bike 1.0 because it provided the familiar feeling of using standard bicycle cranks and pedals and allowed me to change the position of my feet depending on the situation. There were a few drawbacks to this setup though. Without the resistance from the chain and rear wheel, the cranks spun freely, which as a cyclist, I wasn't used to. Another drawback was that the drive side crank arm still contained chain rings. During a crash, the teeth of the chain rings could potentially injure a rider.



Step 6: Ski Rotation Control

Unlike a bicycle wheel that's ready to contact the ground anywhere in its rotation, it's imperative to always keep the skis on a ski-bike with the bottom sides down. Ski-bike 1.0 had no system in place to keep the skis from over rotating in either direction. This potential problem was controlled by limiting Ski-bike 1.0's use to stable snow conditions and no large jumps.



One key attribute of these two systems is that they both can easily be disengaged when needed, such as during transportation.




Step 8: Conclusion

Ski-Bike 2.0的性能是滑雪自行车1.0领先的巨大步骤。我能够自信地滑雪,以合理的滑雪山快速作为典型的滑雪者或滑雪板。当我打开把手时,前面的滑雪挖了它的边缘进入雪中,让我雕刻扫一圈,每当我想要的时候停止。每次改进都很明显。

Here is a quick summary of each improvement made to build Ski-bike 2.0 and the resulting performance increase:

  • 使用小型全悬架自行车架=较轻的重量,更易于处理
  • Building mounting brackets out of steel = noticeable increase in rigidity and ability to fasten to ski via screw holes
  • 通过安装支架尺寸降低轴高=较低的重心使转动和倾斜更容易,更自信
  • Using twin tipped ski blades = allowed sliding backwards and the use of the screw holes for secure fastening to mounting brackets
  • Increasing fork travel reduced the head tube angle = more confident steering and control when pointed downhill
  • Using short unicycle crank arms = increased ground clearance, no chain rings to worry about, and minimized feeling of no resistance
  • Creating a bungee and torsion spring rotation control = prevented front and rear skis from nose diving while airborne

Ski-bike 2.0是一个重大的成功。它实现了y performance goal that I set and more importantly, it was an absolute thrill to ride. While I will ride Ski-bike 2.0 as is for a while, I can't help but contemplate ideas for Ski-bike 3.0. Be on the look out. But until then, check out the video highlights ofSki-bike 2.0 in action!

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    通过降低BB /轴高度,您是否冒着击中底部支架?我觉得好像坐骑必须比前/后叉的速度高约10毫米,以防止在大滴/跳上击中底部支架。我真的想为即将到来的冬天做这个转换,但我不想摧毁我的MTB框架,以便我仍然可以在夏天使用它!:D.


    Reply 3 years ago

    I don't think there's a real risk of hitting the bottom bracket. Even with the axles lowered, the suspension on most mountain bikes doesn't have enough travel for the bottom bracket to drop low enough to hit the ground. Another aspect is that I'm only using this on ski hills with snow-pack and there aren't any rocks or log hazards like you might find mountain biking. You should give it shot!








    5 years ago

    How long are the skis that you used? And what bike frame did you use?








    5 years ago

    Version 3.0 should offer brakes on the handlebar like a regular bike, not for stopping the bike, just slowing it down. But great job, had a lot of improvements from 1.0


    6 years ago

    Nice but I don't see the use for the pedals. Anyway got my vote hope you win!





    5年前Step 8

    Just wondering how much of a hassle ski areas give you to bring this on the slope. Around here I am guessing they wouldn't allow it.



    I would strongly advise calling ahead and asking if the hill allows ski-bikes. I found a hill in my area that allows ski-bikes through theAmerican Ski-bike Association网站,并没有麻烦。即使是驾驶架运营商也认为滑雪自行车很酷!


    5 years ago




    Very nice design! To me however, it looks like a great way to break my neck.

    Hmmmm I'm thinking for my skill level something along the lines of a 3 ski would work for me. Low to the ground like the old school big wheels. I think you did an excellent job!


    5 years ago