Mountain Bike Scooter





Introduction: Mountain Bike Scooter

Humana Health by Design Contest

Finalist in the
Humana Health by Design Contest

It's a better, faster, funner scooter.  Ready for Maker Faire 2010!
Combining the front end of a mountain bike with the back end of a kick scooter makes a high performance scooter that is easy to ride.
The high wheel shape (aka penny farthing) hearkens back to the 1880s when big wheels ruled the roads.  They too were pursuing greater comfort and more speed. 

Video of synchronized scootering at youtube:

Dumpster rescued items including: scooter, mountain bike front end, floor boards, spray paint.
Store bought items: 4 nuts and bolts, 2 grips, varnish, 3 feet of 1.5" steel tube

Other unusual bikes located at:

Step 1: Layout Using the RAD System (Reality Aided Design)

Reality Aided Design refers to laying the parts out and eyeballing the geometry.   (no software needed)  Here I'm setting up the basics of a scooter body behind a mountain bike front end.  The yardstick represents the steering axis (center of the head-tube).  Note the steering axis intersects the ground ahead of the front tire contact point on the road.  The tire contact point 'trails" the steering axis.  As a side note to bike designers... The bend of the fork blades produces "rake" aka "offset" that consumes part of the trail to shorten or snug-up the trail for a certain head angle and wheel diameter.

Step 2: More Layout

Laying the back bone (aka down-tube) into the picture I see I will have to bend it to get it around the tire and ahead of the foot zone.

Step 3: The Bender

A 12 ton hydraulic press pipe bender easily bends the thin wall tubing.  Maybe too easily.

Step 4: Might We Need a Miter?

In order to have a strong joint between two cylindrical tubes we need a mitered joint.  That way the end of one tube conforms to the side of other.  It gives a lot of length of contact to weld and more widely distributes the forces while riding.

Step 5: Mitering With a Hole Saw

Using a hole saw the same diameter as the head-tube I drilled a hole (in the down-tube) at the connection angle between the down-tube and the head-tube.  It was done with the down-tube in a sturdy vice and eye balled to a diagonal line drawn on the tube.  Remember to run the drill speed fairly slow (100-200 rpm) for these large diameter holes.

Step 6: Hole Saw Carves a Place for the Head Tube

Might we miter a mighty fine joint to mightily mitigate forces that might manifest from manhandling?

Step 7: Dry Fit

Laying it all out again before the crucial weld, just to admire it.

Step 8: Tack Weld and Then Re-check Alignment

A couple of small weld points hold head-tube to down-tube.  The shiny pipe passing through head-tube is for alignment purposes.

Step 9: All Welded Up

Just needs its stem and bars re-installed.

Step 10: With Bars and the Wood Deck Installed

The wood deck is two pieces of 3/4" oak hardwood flooring bolted to the scooter body.

Step 11: Painted and Varnished

Frame was spray painted,  Deck was floor stained and varnished.  It rides nice!
Lessons learned: next time I will try to curve the down-tube closer to the wheel to try to bring the scooter body further forward.  that has the effect of reducing the reach forward, distributing more weight onto the big front wheel and reducing the vehicle length by about 2-3".



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    I really wanna make this, but I don't have a welding torch, or the hydraulic press, so do you think it'd be safe to make the down-tube out of two 2x4's joined at an angle?

    That could work. Another way might be to join the straight metal down tube to a vertical 2x4 that is bolted between the riser plates of a Razor scooter deck. The joint could be by bolting through the down tube and 2x4. It may be tricky to make the joint strong. Another way to get welding is to cut and file your parts so they fit well and taking them to a muffler shop for a quick weld. They are good at welding thin walled steel tubing.

    It is cool, and actually Kool Kat has made something similar to the mountain bike scooter. I still like it though, very interesting!

    Epic! :D Too bad I don't have half of the things to make this... :(

    I looked at the picture again and I realized that the scooter has a handbrake! No having to stop with your foot!

    I see what you did there.... its a bikescooter!

    This is a great Idea. I have all wood working skills and little experience with metal, but I just got an ARC welder and a gas torch welder so I think I will test my skill on a smaller version of this for my kids. That way if it falls apart they get hurt not me.  

    my dad made 2 of these about 6 years ago for my brothers. sorry to say, but somebody else has created these before you. glad to see that somebody else is creative enough in a country losing common sense over crazed consumerism and fear. I am sooooooooooooooooooooooooooooooooooooooooooooooooooooo glad that maker fair and instructables exist!!!!!!!!!!!!!!!!!!!

    Don't be sorry. Great minds think alike. I've been making them since 2004 and bringing them to all 7 years of Bay Area Maker Faire to inspire folks to create fun vehicles. Happy making.