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Step 16: New tires

As I mentioned before, I found the largest tires I could for the 8x8 rims. These were the blue knobby 11x22 tires you've seen in most of the pictures.

The problem is they were so square in profile that you had to lean 2 feet over the side of teh bike to steer at speed.

I ended up buying a used pair of tires/wheels. These are much rounder in profile and handle much better.
Nice job on getting it all together. I have built a fat tire bike for kinetic sculpture racing. Here are some solutions that builders may find interesting. Dealing with the chain line and gearing are really a puzzle. Here is the drive system I built. It uses an 8 speed hub as a jackshaft that runs cogs on the disc brake mounts of the hub and rear wheel. It has a second gear set up as a one speed on the other side for road riding.  The 8 speed is for sand, mud and hills. I rode this at Arcata and Corvallis last year and managed to ace the sand at Arcata, and ace the course at Corvallis. I will put up an instructable about this eventually. The basic bike weighs about 50 lbs. add the water gear and it gets up to 75.  What really makes this challenging is that for effective traction in the sand, you need the rider's weight on top of the rear wheel, which makes all the chain issues even more extreme. 
You are correct. I've thought of all those issues and have been contemplating a new version with Nexus hub. The problem with a 10" wide tire is the pedalling clearance at the wheel, necessitating either pushing the rear tire back quite far, as in my case, or pushing the pedlas forward to get the seat (weight) over the rear tire. Also, with the extar wide tire, the hub gets pushed quite a ways outward as well. All things I have been noodling over since I built this. Nice ride. Would like to see close up photos.
<p>NICE!,But I would use a solar panel connected to a electric motor,with 12 v batteries.I seen a motor powered and it was used for a dessert machine.With mini tractor grip type tires.front rim held water extra fuel.While the rear held water or fuel also.It to was a wild to ride in muskeg .</p>
<p>I was thinking one way to reduce weight would be to use an aluminum front portion of a frame. I have a wrecked 21 speed mountain bike with a mono shock that was given to be. All that was damaged is the rear rim and swing arm when the guy came down wrong off a jump. That part would be trashed anyway except the cassette, hub and a part of the swing arm, the lower pivot. The swing arm is steel and bent, but the rest of the bike is fine and aluminum cutting that part of the frame weight in half. A steel swing arm made for the fat tire could bolt rigidly to the aluminum frame, no need for the shock with a tire like in this instructable. </p>
That is so baddass! You need to sell those
Amazing Great :-) Sent to Nephew so he can make it for my Brother :-)
<p>Just a thought..... relocating the back gears to be on the same line as the front gears...</p>
The rear cassette is in line with the front crankset.
<p>cant wait too build me a fattie</p>
<p>I love it! Going to show my son who would love it</p>
<p>Hi, great job. I restore sortlike ( Motor- ) bikes from Yamaha with 350 and 200ccm.</p><p>Therfore a hint for the tires: </p><p>in the EU you can buy those semitrailer tires in DIY stores like Biltema etc. </p><p>Otherwise seems pretty difficult because Dirtbike tires are very rare.</p>
Do you only make custom bikes or could make a racing lawnmower
<p>amazing job there . i'm planning on doing something similar as I want to fabricate my own fatbike for beaches . for mine will be trying to make my own double width wheels by welding 2 together iditabike style . I hadnt thought of the issue of wheel rubbing against the chain but what you did with the extra chain is a clever solution . </p>
<p>I like it! How is the conduit frame holding up?</p>
simple beautiful
make it gas powered
<p>Thanks for sharing.</p><p> I have a Rokon, this is the eco version of it !!</p>
I need to build this right now
That looks awesome, but it looks kind of hard to pedal, so I've got a question for you: is it hard to pedal?
Easy to pedal because of the 21 speeds, however, it is very heavy.
Easy to pedal because of the 21 speeds, however, it is very heavy.
So cool and I just moved to NC too. I have my winter project!!! Thanx. Shhh my wife thinks its over time
I want to ride this so badly down the highway.
i have a moror cycle that has idenical tires to that and requires no pelataling baja mini bike
Several people have commented to me that all this needs is a motor. Since the purpose of the project was to make a bicycle (the pelataling kind) , that kind of defeats the objective. Some places do not allow motorized vehicles.
&nbsp;Putting a motor on this would essentially amount to a Heald Super Bronc....a VERY cool MAXI (not mini!) Bike.
...or a Rokon. Crazy little things.
Rokons are badA$$ AND 2 wheel drive!! Healds were one wheel drive but still killer.
true. one with both would be relay cool. I have tryed to ride a bike on a beach and it is hard so I like the fat tires
wicked
Agreed ;) Love finding the perfect object like that! Its one of the best feelings in DIY.
That is a sweet looking ride!
I Seee <br>
Your Ride the spine link is no good it keeps redirecting me. other than that this bike is a great imaginative project
i looked, it's riding the spine, not ride.
Holy crap!<br>I've had the wrong link out there for 4 years.<br>Thanks for picking that up.<br>I have corrected it now.
last triumph, turning it into a trike or 4 wheeler, 49cc bike motor added, it could be rather fun.
YOU my dear friend, are a friggin genius !!!!!!!!!!!!!!!!!!!!!!!!!! <br>Thanks for all the tips and tricks and steps and thinking you went through with this bike!!! <br>I made one just like it only started with a Yamaha 7 inch fat tire dirt bike frame and disappeared the motor and transmission and welded in a Schwinn 12 speed bike frame and then proceeded to play with it until it worked. Current rendition has a 3 speed front derailer and a one speed rear. Kept the shocks and the front brake and it rides a little funny as your knees have to be out at a 45 degree angle to avoid hitting the rear shock brackets and it's one really looooooong chain with no jack-shaft like yours.
Also, I beat you, mine weighs 110 pounds! And needed two 4 inch steel threaded extensions on the crank arms to keep from hitting the rear shock brackets. Those dirt bike frames are really sturdy and seriously heavy !!!
it appears the bottom bracket is lower to the ground than on a regular 26&quot; mtn bike since the rims are so much smaller and you didn't modify the basic frame design of the donar bike. Does this matter when cornering? I would imagine if you're not bunny hopping logs it wont matter.
Actually, the bike was constructed to obtain a normal mtn. bike BB height of around 12 1/2 - 13&quot;.<br>Handling in deep snow is not great due to weight of bike and geometry. Better in sand.
how well does it work on snow? <br>
I had trouble connecting with the Ride the Spine website, but I did find a direct link to the Chupacabra bike mentioned in the text body here http://www.ridingthespine.com/Journey/category/chupacabra. There are some amazing and innovative resolutions to design problems in both bikes. <br>
hey can u send me the measurements?
Can you be more specific on what dimensions you mean?
srry bout the way i put it but is there any specific mesurments for the bike?
You will be pleased to know that I thought (from your trailer vid) that you had bought this bike. Excellent work and idea.
thanks for sharing your amazing bicycle with us. can we put an engine in this bicycle?
i want to build one of these for around town use i just need to make is hard to steal what would you suggest?<br>i cant think of a nicer bike thanks

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