Any ideas for passenger foot-pegs?

Discussion in 'General Questions' started by Ollie, Dec 5, 2013.

  1. Ollie

    Ollie Member

    Today I bought a rear pannier rack for my bike with the intention to make a passenger seat. I've zip-tied an old sprung saddle to it but I'm not sure what to do for foot-pegs. I don't have enough axle space to bolt on BMX pegs, so I wondered if anybody had any suggestions. FYI, the saddle is mounted backwards to make it level. I also don't have access to welding equipment or I'd just tag something onto the chain stays.
     

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    Last edited: Dec 5, 2013

  2. LR Jerry

    LR Jerry Well-Known Member

    Racks aren't designed to support a human being. Some states in the USA will allow you to put a baby carriage on a rack. So here in the USA its illegal to transport more than one person on a bicycle designed for one person. The only exception is a baby.

    It's not allowed here because a rack can't support the weight of a human. 75 lbs on a rack would really be pushing it.
     
  3. Ollie

    Ollie Member

    Hey Jerry, thanks for the warning. Law-wise I can do what I like here, but you make a good point about the strength. After seeing local street merchants and delivery guys over-loading this type of rack I assumed they could take a considerable weight. I'll make sure to strengthen it before I accept any passengers; I've got some old rigid forks kicking about that might be good for it.
     
  4. SunkyWorks

    SunkyWorks Member

  5. Ollie

    Ollie Member

    Nice pegs, they would be great! Due to Brazil's 100% import tax, the cost of getting them shipped here is beyond what I can justify spending, but I'll have a look around locally for something similar. Thanks for the idea :)
     
  6. SunkyWorks

    SunkyWorks Member

    If you can find a steel peg with thread length of at least 1.5 times the diameter (.38" * 1.5 = .56") , this is the engineering rule I was taught.
    Of course you would need to tighten it just like an axle nut with the same torque.

    I have seen some cheap steel pegs that were so thin that that they must have been meant to be used like a washer under the axle nut,
    that might work.

    Google image search for -- clamp on footpegs. These are for motorcycles, but you might be able to make your own.
     
    Last edited: Dec 6, 2013
  7. Scootmeister

    Scootmeister Member

    Hello Ollie:

    I would be concerned about the stress the additional weight will put on the engine, drive train, and brakes. Will you engine pull the conbined weight of two people?
     
  8. wheelbender6

    wheelbender6 Well-Known Member

    Motorcycle shops used to sell buddy pegs that clamped around your swing arm. You may be able to adapt a set of those to your motorbike.
     
  9. Stoltzee

    Stoltzee Member

    Just get 2 pieces of 1/8 inch flat steel about 4 inches each.
    Drill a hole in them, (near ends) and put them behind the nuts on the rear axle.
    Put a crescent wrench on them, and bend them out. (Unless you have a vise. Then you can hammer or bend them easily)
    Now wrap them real good with tape, so you don't gouge your ankles.

    It may not be pretty, but it will work.
     
  10. Ollie

    Ollie Member

    @SunkyWorks - That looks like a good rule of thumb, thanks. One worry I have is that the pegs may come loose as the passenger shifts around. Do you think that's likely to happen?

    @Scootmeister - After a short trip with a willing volunteer, it appears that the engine can deal with 2 people comfortably (on flat ground). The brake can stop the bike effectively at low speeds, but I'd never ride fast with a passenger anyway. I appreciate the concern, FYI no further passengers will be accepted until I've strengthened the back end and installed foot-pegs.

    @wheelbender6 - The kind of thing you mention is what I first thought of, but after a recent debacle with my chain tensioner I realised that my chainstays will squash flat before allowing anything to be securely clamped to them.

    @Stoltzee - I've been trying to find some L-shaped brackets that match what you're describing, I may have to make my own then. Thanks :)

    I've got an idea brewing that'll combine a re-enforcment of the passenger seat with a place to mount foot-pegs. I've posted a brief sketch below. Basically it's a wooden frame that fits under the rack (to help support weight) and is attached to the chainstays (and every other part of the frame available). I'll drill some holes in the sides and bolt on some old pedals for foot-pegs. I don't have the equipment for drilling steel, so wood is going to be my material of choice for now. Am I making a terrible mistake?

    passenger.jpg
     
  11. BigBlue

    BigBlue Active Member

    I found this picture a while back on Google Images. It might be starting point of an option if you can fabricate or have someone help you:

    bikeT.jpg

    Here's another possibility. Instead of a box, how about installing a seat. I believe the sidecar was made from a mountain bike frame. I copied them from a Blog:

    100_2671-766511.jpg 100_2672-769013.jpg 100_2673-771362.jpg 100_2674-772927.jpg 100_2675-774135.jpg 100_2676-775584.jpg

    Good Luck,

    Chris
    AKA: BigBlue
     
  12. Ollie

    Ollie Member

    What a fantastic sidecar! I love the way the bike is able to lean independently of the car. Thanks for the ideas; whenever I get access to welding equipment or someone who can do it for me, I suspect some rather magical things may happen :)
     
  13. Barry

    Barry Member

    Hey Ollie,
    In my day job in the aviation field, we designed a roll-on-roll-off radar system as a proof of concept that was a temp mount facing aft. a full 1/3 of the radar operators who were involved with the testing puked after about 30 minutes of flying in this backwards configuration. Not to burst your bubble but, just saying!
    Barry
     
  14. bigoilbob

    bigoilbob Member

    I'll say what LR and others R 2 nice 2 say. Want 2 on a motorized bike? Start with a bicycle BUILT for 2. BUILT is a loaded word, inferring ground up engineering. Without that, UR ****ing with your and your passenger's health. Even then, U have the extra risk (that we all take) in motorizing it.

    I'm guilty here - if my motorized tandem frame crumples on me, wheel falls apart, etc., it's 2 of us in jackpot, not just one. But it's WAY better than another 150-?#, PLUS the motorization weight.
     
  15. Ollie

    Ollie Member

    @Barry - Thanks for the warning, but I intended for the passenger to face forward. I mounted the saddle backwards to make it level; if it had been the right way around it would have sloped forward too much.

    @bigoilbob - I agree, my frame is low-quality and the tubing is thin. I also noticed the other day that the rear wheel is slowly turning into a pringle, possibly due to the passenger test-rides.


    I guess this is the end of the passenger seat until I get a stronger frame and set of wheels. Thanks for the sensible advice guys, it was an interesting project while it lasted.
     
  16. bigoilbob

    bigoilbob Member

    @Ollie

    My tiresome preaching was not just for you at all. FYI, I think it's terrific that you want a passenger. My passengers include wife, grand kids, strangers we meet camping. I fly paramotors and ride a 650 Dakar, but I get more out of a happy motorized tandem passenger than anything else.

    I know used tandems cost $, but if you take the responsibility of another life I think you need (at least) to start with a product that has had dynamic Goodman stress analyses. Not a bike business expert, but I can't imagine a reputable tandem manufacturer over the last 30 years who has NOT run these numbers. Usually along with rides to failure with strain gauge transducers, to calibrate their free body models.
     
  17. HeadSmess

    HeadSmess Well-Known Member

    tandem.JPG
    make the runts pedal too!


    16.jpg


    or just go fast...
     
    bigoilbob likes this.
  18. keatonx

    keatonx Member

    Why not get a banana seat with a sissy bar, sissy bar? You can take out the seat part, and insert a wood plank (the same width) where the seat was, and put screws through the metal bar into the sides of the wood.
    Then you can put bike seats on top of the wood if you want
     
  19. Loose Nut

    Loose Nut Member

  20. Ollie

    Ollie Member

    Thanks, great site. I've bookmarked it for when I find a more suitable frame and wheels.

    For now, my passenger problems have been overcome by buying a little 50cc motorbike. In Brazil it falls into the same category as a motorized bicycle so I don't need a license or registration:

    DSC00235.jpg
     
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