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Cheap Short Wheelbase Wood Conversion Recumbent Bike

Cheap Short Wheelbase Wood Conversion Recumbent Bike
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Or CSWWCRB, for short.

Perhaps you've seen one or two in your hometown, or not at all. Recumbent bikes tend to have a (lets say) "mature" following as compared to it's traditional bike counterpart. Perhaps that's because 'bents are more expensive due to their comparatively low production volume. For this reason, you'll find a lot of people making home built 'bent frames and fairings.

For this project, I'm making a short wheelbase (SWB) 'bent on a very small budget and recycling components from other bikes in addition to a frame. I call it

The WidowMaker



I should mention, WoodenBikes.com is an awesome site worth checking out ;) If it wasn't for encouraging words from the site (and meeting/talking with the man behind the site at Maker Faire) - I would have been weary about mounting a crank in wood :p

One day, I want to build an awesome 4x4 tandem battering ram :D
 
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Step 1Materials and Tools Used

Materials
1 Womens Beach Cruiser frame with rear wheel and coaster brake
Some pine 2x4
5 Bolts/nuts
18 washers
1 rear derailleur
Scrap .5" PVC and cement
Extra chain
20" wheel from a children's bike (optional)
1 piece crank from another donor bike (which also gave up chain and derailleur)

Tools
2 C Clamps
Adjustable Wrench
Saw
Drill and bits
Hole Saw
Chain Tool
Screwdriver
Hammer (for removing BB cups)
Measuring tape (for measuring X-seam etc.)
Something straight and long (measuring tape works)

Optional
Crank puller (or go to your local bike shop and have them pull your crank - for the non 1 piece crank guys)

There won't be any hack sawing, welding or irreversible changes made to the frame to be converted ;)
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31 comments
Oct 26, 2011. 2:06 AMmon churlish says:
nice cycle<<
Jan 9, 2011. 6:31 AMnanundo says:
This's my inspiration I wish do this with my self
thank you.
Jan 9, 2008. 10:05 PMglassspider2142 says:
yo bro i am lazy as a baptast sunday! even i can get exersize with your bike as i love to recumbent! hell i may even lay off my next heart attack for a year or two!
Jan 3, 2008. 6:15 PMShifrin says:
This is a Great Instructable, I've always been wanting to both make and ride one of these, Hopefully now I can! Thanks -Alex
Dec 7, 2007. 10:05 PMWoodenbikes says:
Way to go Trebuchet3! Welcome to the www! (wonderful world of wood). These wood bikes are pretty addictive, in their funky clunky ways. It just makes you want to experiment more. A nice wood paneling fairing shell could greatly increase the danger factor on Widowmaker. In fact, now you've given me the idea to make the recumbent wood box coffincycle. Keep up the good work!
Nov 29, 2007. 9:03 PMolderguy says:
This sounds like a fun thing to do. It's going to be my 2nd project. Right after the bike trailer.
Nov 8, 2007. 3:32 PMJohn Smith says:
Good Instructable. Is there any reason to choose a recumbent design over a regular one? Last pic of last step: Do I spy a Ka-Bar?
Nov 11, 2007. 3:02 PMtippmannphreak says:
haha! i think so
Apr 16, 2008. 11:35 AMCosantoir says:
The speed records are on rather specialized 'bents... Complete with full fairings, lead vehicles to reduce air resistance, etc... And actually, the current "never mind the details" speed record (130+ mph) is held by a rather mundane "safety" bike, though one going steeply downhill. All the same, the speed records of any sort are so divorced from normal bike riding that it's hard to justify bringing them up. Recumbents have some ergonomic advantages, but also some practical disadvantages. Relatively poor visibility, in both the "seeing things" and "being seen" senses of the word, is certainly worth consideration. Riding a bike for utilitarian reasons---as opposed to weekend recreational riding---demands somewhat different tests of practicality. Recumbents have a considerably lower profile than the more common "safety" (or "double diamond", "triangle", etc) sort of bike, and this can result in considerably more risk when sharing traffic with autos. The lesser ability to deliver gravity-assisted pedaling power can also impact the hauling of heavy loads; though I have to admit I've never seen a recumbent designed for hauling heavy loads in the was the various "cargo bikes" or "longbikes" are built. But, again from a strictly utilitarian viewpoint, a bike that can't haul 100+ pounds without excessive effort is of little use...
Jul 12, 2008. 9:37 AMJohn Smith says:
dang that looks comfortable... but i'm more of an offroad kinda bike rider. i prefer to stand up when i'm riding on trails. either way, thats pretty cool. I'd try it.
Nov 10, 2007. 2:16 PMkill-a-watt says:
there are a few more drawbacks. Keep in mind, I'm not a 'bent hater here Jumping curbs, off road riding - much tougher with the recumbent. Not being able to pull a wheelie is a major disadvantage everywhere besides the paved bike trail. Bike racks on public transport - putting a 'bent on a bike rack on the metrobus is not allowed. This has more to do with the shape of the 'bent than anything else. So having a 'bent may restrict your commuting options.
Nov 11, 2007. 8:38 AMkill-a-watt says:
I'm an extremely pedestrian conscious bicycle rider. This comes from being a hiker first and foremost and my personal experience on many mixed use trails (summery: I don't mind the horses, but If I have to pick up after my pet, why don't they? -and- Well over 51% of bicyclist on the trails are either ignorant or outright hostile toward "sharing the ~~road~~ trail". Twice, for example, I've been hit by ignorant and careless bike riders that did not announce that they were overtaking me.) I'm also careful around autos. I know I have as much right to the road as them but well, Force equals Mass times Velocity squared. All this is a roundabout way of saying I hop curbs, a lot (please note that I stuck wheelies in there with hopping curbs. I'm not going to bash 'bents for not being able to pull a wheelie for the wheelie's sake) I break the law and ride on the sidewalk as a safety measure unless there is a pedestrian there. Being able to hop a curb is a safety maneuver that I don't want to be without. I ride a MTB in a mixed suburban neighborhood. That means that there are a variety of different terrain where I ride. There's a roadway nearby with a wide bike trail on the shoulder. However, to get to my house, I've got to turn on a road that has a very narrow two lane bridge. I can avoid this hotspot if I instead ride behind a shopping center, through a field, through a singletrack in the woods with a creek crossing, and through a townhouse neighborhood. I hop curbs a lot. All the metro busses in the greater DC area have bike racks. That's an advantage while being out and about while carless that I don't want to miss. In short, although I crave the comfortable seating of a 'bent, it's not suited for my style of riding. I do have a bunch of 20" bike parts around and I am lusting after a purpose built 'bent MTB for biking on the C&O towpath, which is technically off the pavement, but I'm betting that I won't ride that one nearly as much.
Nov 12, 2007. 12:09 AMkill-a-watt says:
Nothing came off as offensive, and that was never my intent either.
Nov 11, 2007. 7:52 AMkill-a-watt says:
Interesting., however these were pretty tame trails for a MTB. I didn't see a single log across the trail or a creek crossing with large rocks. Even the last scene had the 'bent going off the trail to avoid that hump, a minor violation of the "tread lightly" philosophy. MTBiking would not be what it is without the bunny-hop.
Nov 9, 2007. 4:38 AMJohn Smith says:
Oh, I didn't know that.

81mph on a bike?!?!? Taht iz fazt!
Nov 9, 2007. 1:37 AMLeon Close says:
Very nice, I have a similar but slightly more complicated project started myself. For the bottom (front?) bracket, would it not be better to chop the entire shell, complete with bearing cups, from a donor frame? I'm thinking there will be problems with bearing adjustment your way.
Nov 9, 2007. 4:55 PMLeon Close says:
Yeah I suppose it wouldn't really be practical to try and use a three piece bracket without the threaded shell. The press in cups certainly make it easy, and the wood should compress as much as it's going to after a few rides. A bit of epoxy would help too.
Nov 9, 2007. 11:44 AMoops56 says:
I know one thing i would not be wearing flip flops on a bike of any kind
Nov 9, 2007. 6:22 AMVisitor says:
Brilliant work (again). Please list the problems you mentioned in last step with your fixes to them. I've seen many recumbents where the chain is routed through a PVC conduit tube. It bends quite nicely and can be used to move the lower chain away from the moving parts. That handlebar looks like it might work under the frame too. IMO that high chopper style bar looks funny. Is there any way to fasten it to the fork crown?
Nov 9, 2007. 6:38 AMVisitor says:
Oh, and I can't help thinking that if one extends the longer 2x4 all the way to the rear axle, one wouldn't need a complete steel frame at all. My wife doesn't allow any more bikes in the house but I think I could build this so that she doesn't realize what it is until it is too late...
Nov 9, 2007. 12:52 AMLftndbt says:
This makes me smile ;) Hardcore biker here... The guys at work bag me enough as it is for riding ( yet individually all have asked me how to get their calves looking like my guns by summer... ;P ) I always wanted to have one of these! Not sure if the cannondale will convert though....;) Bike's are sooo good... Nice Instructable!

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Author:trebuchet03
I'm an Engineer in San Francisco. Mass producer. Former Intern. Rapid Prototyper. Sometimes, I post Instructables. My Favorite number: 42 By profession - I am an energy engineer. I count electrons p...
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