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Old 01-09-11, 07:44 PM   #1
ma figueroa
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road bike turned trike

i wanted to build a trike from a road bike for some time. finally got it done. took an old raliegh ten speed and made a ten speed trike out of it. it took some thinking , guessing and research to put the project together. i was afraid that the machine work might be a problem but that wasnt the case at all. infact the machine work was the easier part. the hardest part was locating suitable wheels for the rear and that took several months. painting only required waiting for the cold snap to pass. there are no plans. its one of those project where in the parts direct the build. if you want one you can build one. its easy; he says. its a little scary to ride. it wants to push as nascar folks say and because the rider is seated so high its a bit tippy. smaller tires on the back might help the push and overall small wheels might make it less tippy. hope you enjoy as much i did building it. micheal












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Old 01-09-11, 08:38 PM   #2
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So do you have a differential, right wheel only drive or a locked rear axle?
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Old 01-09-11, 08:58 PM   #3
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Same question, how does it corner. Does it have a diff?
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Old 01-09-11, 09:30 PM   #4
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Nice job. Did you have a chance to take an in-person, up close look at any actual racing trikes prior to building yours? I've never seen one.
http://www.flickr.com/groups/1063134@N22/
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Old 01-09-11, 10:28 PM   #5
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WOW!!!!! Looks like a factory built job!!!!!!!!
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Old 01-10-11, 07:16 AM   #6
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Quote:
Originally Posted by ma figueroa View Post
i wanted to build a trike from a road bike for some time. finally got it done. ...
I had seen the $150 trike conversion kits for bicycles and thought of using one on my recumbent bicycle, but all the trike kits only had a single-speed coaster brake rear end and there was no easy way to get a multi-speed hub of any kind in there without machine tools. Now I have the machine tools to do it, but have other things going on and really don't have the time or storage space. :P

There are also trike racing organizations still going in Europe, if you didn't know. They use custom-built frames but would have a source for hubs.
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Old 01-10-11, 11:42 AM   #7
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GB has a long tradition of lightweight trike races .. tend to all be single drive wheel as its lighter

and if all competitors use the same kit, its about rider skill and daring-do.

I've seen 2 front wheel conversions too. bike frame unchanged , big front load capable.
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Old 01-10-11, 01:43 PM   #8
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I have seen conversions done on Tandems- both front and rear And it may not be necessary in your case. They have extra stays running inboard from the wheel bub to the top of the seat stay. Keeps the frame from flexing where it attaches to the conversion.

Nice Trike.
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Old 01-10-11, 02:38 PM   #9
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Looks like the "push" is cause by it being a multi-speed fixed gear. Too bad there isn't a way to fashion a free wheel hub in there to take care of that situation.
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Old 01-10-11, 05:11 PM   #10
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Looks like the "push" is cause by it being a multi-speed fixed gear. Too bad there isn't a way to fashion a free wheel hub in there to take care of that situation.
There is a way. You would need a threaded block to fit over the axle. I've got a few spares at work.
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Old 01-10-11, 05:15 PM   #11
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had no clue that racing trikes exsisted. was just looking for a more convinent way to travel about in the neighborhood. i knew that single speed kits were available and have seen two speed factory trikes pass by my home. i wanted a bit more; something out of the ordinary and to see if my ideas would work. there isnt a differential. the trike uses an axel that is common to both rear wheels. ive been researching trike m/cs and have found several that appear to use a primitive rear differential. research has also revealed an easy and inexspensive way to make suitable hubs. the cage like structure that surrounds the rear axel housing provides, i believe, enough strentgh so as not to require additional frame tube members. the bridge like structure is not unknow to bike builders. i probibly will never figure out the entire nature of the "push" and will just live with it. i dont have many miles on the trike, but have toured the neighborhood. the bike is pleasent enough to ride and is only problematical when sharp cornors are encountered. refining the idea is left to others to do. ill ride the trike as time and weather allow. for me the greatest pleasure was the doing not the trike. thanks to all who have responded to this post. micheal
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Old 01-10-11, 05:44 PM   #12
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That's really cool. Good job!
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Old 01-10-11, 09:18 PM   #13
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nice work, I wish I had a mind to create stuff like that. I'm too much logic and not enough creativity. I like how you made it a bolt-on kit rather than cutting and modifying the frame.
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Old 01-11-11, 04:56 PM   #14
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Great job and beautifully executed. I converted an old Peugeot for my wife with a conversion kit from the late Ken Rogers (UK). It relied on two brakes on the front, one cantilever and one centre pull. I really like your disk set up. Would make it much more stable under braking load than the 2-front set up

You could always try logging on to http://www.tricycleassociation.org.uk/ for a wide variety of pics and other useful info.

One of our members was 2-3 times world 40k trike TT champion and multiple national TT champ on both trike and tandem trike
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Old 01-11-11, 06:10 PM   #15
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Quote:
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Looks like the "push" is cause by it being a multi-speed fixed gear. Too bad there isn't a way to fashion a free wheel hub in there to take care of that situation.
Nope. The "push" is due to the solid rear axle powering both rear wheels at the same speed.
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Old 01-11-11, 09:07 PM   #16
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Single wheel setups power the left wheel, as the drivetrain hardware like freewheels of old is RH thread.

Next version, you can separate the braking, 1 to each wheel in back, and just turn one wheel ..

though there was a 'where do i get a differential?' thread a couple weeks back.
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Old 01-13-11, 03:41 PM   #17
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Single wheel setups power the left wheel, as the drivetrain hardware like freewheels of old is RH thread.

Next version, you can separate the braking, 1 to each wheel in back, and just turn one wheel ..

though there was a 'where do i get a differential?' thread a couple weeks back.
As I have read it--ideally the powered wheel should be the side opposite of where oncoming traffic drives. The reason is that (for example, in the US) if you turn left across the oncoming traffic lane, you do not want the left wheel driven, since it will lift and lose traction if you turn too hard--leaving you stranded in the lane of oncoming traffic.

--------

Also--differentials are usually not worth it on upright pedal-trikes. The reason is that there is no means of limiting the slip, so if one wheel loses traction totally (such as lifting in a turn) then the other wheel doesn't get power at all--the wheel with no traction just spins 2X as fast.

What seems to work better is to use a split axle with freewheels on each side. In a normal turn the slower wheel gets the power, but if it loses traction and begins to spin for any reason, then the OTHER wheel is driven at the same 1X rate. This allows turning without under-steering, but still spreads the power equally to both wheels if one loses traction. (it avoids the situation I described above, for example)
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Old 01-14-11, 07:53 AM   #18
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thanks again to those that respond to the post. have read the several responces to the "push" problem. several of my friends with whom ive disscussed the problem offered the "differential" solution. i own and and have driven race cars with "locked rear ends". push or lose of steering control only occured when the front suspension/ tires lost their ability to direct the car. when the rear tires give up traction the cars go into over steer condition which often can be controled with counter steer. please continue with disscussion. the weather here has been miserable and i havent had a chance to ride my shinny machine, but have gone on to the recumbent project. i dont think ill be doing anything "new" there but just enjoying the build. micheal
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Old 01-14-11, 08:26 AM   #19
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I like it, I never knew that racing trikes even existed. Awesome job!
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Old 01-14-11, 10:32 AM   #20
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i own and and have driven race cars with "locked rear ends".
I don't think that it's the same thing. Race cars that have locked rear ends also have lots of power. Power will overcome many ills. Many of the challenges of bicycle design have to do with making the most of a wimpy motor.
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Old 01-14-11, 01:44 PM   #21
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This is the UK home of lightweight, performance tricycles. Lots of pictures and links to famous builders.
The premier Uk trike builder is probably Longstaff. George Longstaff made some great 2-wheel drive systems but you can imagine the size of the market for these devices.
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Old 01-15-11, 09:47 PM   #22
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Interesting job.

Not 100% sure I'm a fan of what appears to be all grade 4 nuts and bolts, along with neither lock washers or locknuts, but that's my MIL-SPEC machine shop background coming out.
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Old 01-15-11, 09:49 PM   #23
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I don't think that it's the same thing. Race cars that have locked rear ends also have lots of power. Power will overcome many ills. Many of the challenges of bicycle design have to do with making the most of a wimpy motor.
Err, dunno about that. In my younger and crazier days I ran a car with a spool on the street....it definitely hopped the inside wheel on even minor turns. Yeah, O understand that pedal power isn't going to make that as easy, but we're also talking a bike tire vs a wide tire too.
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Old 01-16-11, 08:19 AM   #24
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Err, dunno about that. In my younger and crazier days I ran a car with a spool on the street....it definitely hopped the inside wheel on even minor turns. Yeah, O understand that pedal power isn't going to make that as easy, but we're also talking a bike tire vs a wide tire too.
Here's what I know for sure:

1. OP indicates he has a "push" issue.
2. All of the commercially made delta-style trikes that I'm aware of use either some kind of differential or drive only one wheel. That's the first thing that I look at hence my original question.
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Old 01-16-11, 08:42 AM   #25
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Looks pretty cool.

Good job!
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