Has anyone made a 2 wheel drive bike?

Discussion in 'General Questions' started by dillondonnelly1, Dec 4, 2013.

  1. dillondonnelly1

    dillondonnelly1 New Member

    I have been very curious about this lately. I think it's possible but I'm not too sure. I know it would be really hard to do though. If anyone has made one, please post some pics!

  2. Racie35

    Racie35 Member

    Electric front hub gets it done...and there's roller type front engines
  3. butterbean

    butterbean Well-Known Member

    I think he means single drive attached to both wheels, not dual drives. Not sure though.
  4. LR Jerry

    LR Jerry Well-Known Member

    I know there's all wheel drive motorcycles but I don't know of anybody who's transferred that technology over to a motorized bicycle.
  5. BigBlue

    BigBlue Active Member


    BWA was a company that had bikes.

    2wd Bike Tech had plans and kits, but went out of business before I could purchase.

    Jeep Rubicon Classic Adult All Wheel Drive Mountain Bike.

    1991 Legacy Ovation mountain bike.

    I'd like to have a flexible shaft coupled to my Staton dual drive gearbox and drive the front wheel for off-road adventures.

    Just ordered a spiral bevel set from Ebay. I'll either mount the large bevel gear to the spokes with a custom rag joint or make my own front axle adapter (like a sprocket adapter). Another possibility is to get a 135mm wide fork, a rear free wheel axle and mount the large bevel gear to a right hand thread disc brake adapter.


    This is how BWA, Ovation and Christini, attach(ed) the bevel gears on the front wheel:
    frontWheelDrive.jpg front-wheel-drive-bevel-gears.jpg legacyfdrive.JPG

    Here's the YouTube video for 2wd Bike Tech: http://www.youtube.com/watch?v=1RpZWNrdmMk


    AKA: BigBlue
    Last edited: Dec 5, 2013
    LR Jerry and Fabian like this.
  6. Fabian

    Fabian Well-Known Member

    That's some seriously sexy engineering...
  7. Fabian

    Fabian Well-Known Member

    Last edited by a moderator: Dec 15, 2015
    LR Jerry likes this.
  8. LR Jerry

    LR Jerry Well-Known Member

    Wow this is the place to be for discovering new things. I can see some awesome builds which could be built with this technology. I really like the one which let you switch from single to two wheel drive.
  9. LR Jerry

    LR Jerry Well-Known Member

    Hey thanks my friend for bringing this to our attention.
  10. Fabian

    Fabian Well-Known Member

  11. LR Jerry

    LR Jerry Well-Known Member

    Fabian I think it would be better to encase the gears. Debris getting in them may not be to big of an issue under human power. However the torque and power of an engine could cause major problems if debris got in the gears.
  12. HeadSmess

    HeadSmess Well-Known Member

    i dont like the alloy exposed gears! they say they work ok, and i guess they do turn slowly, and are pretty far out of the way... but surely a neat lil carbon fibre/moulded poly cover would only cost a few more dollars?

    shame the system looks to be frame specific, not a bolt on kit... now that would be something!

    i know the rokon is the longest running production 2wd bike... a slow speed, climb anything, oversized minibike for dragging dead moose home with. steering isnt really a big concern.

    anyone looked at the kingpin drive used on (i know this may seem a bit hillbilly to some) tractors with 4wd? use a bevel drive and shaft in the kingpin rather than a uni/cv joint...

    surely the idea could be adapted to a threadless headset and forks?

    gearing/drive is an issue. yamaha had the front wheel driven slightly faster, but with some "slip". the benefit of hydraulics.

    too much and it wears tyres, too little and it wont let you turn properly, as every time you turn, the front wheel travels slightly further than the rear...

    hence the third differential, between front and rear axles.

    how much were the gears on fleabay? i have a collection of cheap grinders for that reason... the gears. looking at the prices on some some machinists supply site made me have an aneurysm. 170 a gear, and the pinion and crown have to be purchased as a set... and very few ratios commercially available.

    spiral bevel/hypoid gears are the hardest of all gears to cut. beyond the scope of a home machinist...normally. straight bevel comes close second. they are just about manageable with the right setup. lot of maths!

    throw in hardening and grinding...

    how can i buy a whole angle grinder for $15? ????
  13. LR Jerry

    LR Jerry Well-Known Member

    HeadSmess I see you to are in agreement with me about the gears not being covered. If you look back at videos you'll see one with a flexible drive shaft. That seems like it would be the easiest one to adapt to the bicycles we use. The video was in BigBlue post.
    Last edited: Dec 5, 2013
  14. BigBlue

    BigBlue Active Member

    Grinder gears cost $15.39 on Ebay with free shipping. I went with a 2.8" diameter gear since it is about the same size as my 15 tooth freewheel on the rear hub. The large is a 41 tooth and the small a 14 tooth. Largest diameter I could find. I didn't want to spend more on a research idea. It is for a Hitachi. Christini uses TEFNI2000 coating on the bevel gears for lubrication and corrosion prevention.

    Covers? Does the Christini motorcycle have a cover on the bevel gears?

    AKA: BigBlue
  15. IbedaYank

    IbedaYank Member

    yep your really going to get an axle to go through a kingpin on a kingpin axle set up...
    or what this diagram calls a spindle bolt
  16. LR Jerry

    LR Jerry Well-Known Member

    Blue even if the Cristini motorcycle doesn't have covers over the gears maybe they should.
  17. BigBlue

    BigBlue Active Member

    Found this research paper that conducted a stress analysis of a harbor freight 4-1/2" angle grinder. The grinder operates at 11,000 rpms and has a rating of 3/4 of a horsepower. A Rockwell Hardness analysis was conducted on the pinion spiral bevel gear. After a conversion was completed, it was estimated that the pinion gear had Tensile Strength of approximately 106,000 psi. Probably what to expect from other replacement grinder spiral bevel gears. My hunch is that the original equipment gears will be of better quality with the name brand grinders. Dewalt makes angle grinders with ratings of 5.3hp.

    Considering that the Honda GHX50 output is approximately 2.1 hp and that approximately 1 hp will be split between the front and rear drives, I think the grinder spiral bevel gears will be O.K. Also consider that the gears won't be spinning at 11,000 rpms like the angle grinder.


    AKA: BigBlue
  18. IbedaYank

    IbedaYank Member

    yeah like all grinders from horrible freight are exactly the same.
  19. LR Jerry

    LR Jerry Well-Known Member

    Blue does this mean we're going to see you on an all wheel drive bike in the future?
  20. HeadSmess

    HeadSmess Well-Known Member

    everything is impossible. everything.

    at first i was going to say, "nice model A pic" but then...the model A ford has the front brake actuator feeding down through the kingpin! so, other than it being old, whatever... its irrelevant :)

    sorry. i wouldnt have mentioned it if i hadnt seen the actual device, as attached to a ford 2120 tractor. i believe theyre also marketed as "new holland".


    patented idea... http://www.google.com/patents/US2306958



    well, maybe im dreaming again...but it seems at least someone worked out how to get a drive down through the kingpin...
    Last edited: Dec 6, 2013