Pedal Clearance

Discussion in 'Motorized Bicycle General Discussion' started by sboricic123, May 25, 2015.

  1. sboricic123

    sboricic123 Member

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    I'll be putting an engine on this 1973 Vintage some day soon. Right now, the pedals don't clear the engine. Is there a pedal extension or other ideas you'd recommend? I see them avlb on-line but don't want to buy the wrong kit if it's 1 piece or 3 piece.
     

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  2. YesImLDS

    YesImLDS Member

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    There are some vendors around that sell wide pedal crank sets that will definitely clear! Now I don't exactly know anything about pedal cranks as I have never taken one off or replaced one so I wouldn't know anything about sizes. You might just look around and see what you can find searching wide pedal cranks.
     
  3. crassius

    crassius Well-Known Member

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    if pedal sprocket & chain don't clear, you may have to change crank (or mount engine higher), but if it is just the back of the pedals themselves, you may want to just file that part down a bit
     
  4. Nashville Kat

    Nashville Kat Active Member

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    The three piece crank presents a problem- on the other hand it's your chance to get rid of the heavy steel cottered (never that good) crankset.

    Sick Bikes used to sell longer crank spindles, except they are for four cornered splined and not cottered cranks (Cotter pins are a pain because the cotters wear and the arms start to slip on the spindle. There were about three sizes but they went gradually out of use by the end of the 1970's.

    You may want an alloy fixie crank- you can get for about $50 on ebay= much lighter and better crank then

    Diamond frames also present some clearance issues at the rear stay, so you'll probably have to have a good tensioner on the chain there. You may have to flip that motor sprocket the other way.

    Years ago there was a nice tank that sat beneath the top bar , but they've been listed out of stock at gasbike for years now. The tear drop gets in the way of peddling more on a lightweight frame, so don't get an exceptionally large one!

    Is that a "CITOH"? Looks like their paint and lugs. I had a frame like that once..
     
    #4 Nashville Kat, May 26, 2015
    Last edited: May 26, 2015
  5. Nashville Kat

    Nashville Kat Active Member

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    Looking closely at the bottokm bracket now- Not sure if that's a standard three piece diameter or a one piece converted (originally? never seen that done!)

    So you need to see which diameter bearings fit in there- if it takes regular one piece crank sizes, you can get a wider one of those too, but you'll also need a standard one piece set of bearings and races
     
  6. curtisfox

    curtisfox Well-Known Member

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    Yes it does look like a old style one piece crank hub with some kind of conversion to a three piece crank. You ar just going to have to take it apart and find out what size the bearings are,and go from there................Curt
     
  7. Nashville Kat

    Nashville Kat Active Member

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  8. silverbear

    silverbear The Boy Who Never Grew Up

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    You didn't mention what engine is going into the frame. If it is a China girl and the clearance issue is that a little bit more room and the pedal would clear you may find that just switching the crank with one made in China or Japan will give you clearance. The bike looks like it may be a Schwinn. If so, then switching the crank (along with the donor crank's bearings and fittings) will save the day. I did this with a couple of 1960's Schwinns and didn't have to buy anything. Good luck.
    SB
     
  9. sboricic123

    sboricic123 Member

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    I will be putting a Skyhawk 66cc on it. The pedals are nut and bolt on to the crank. The make is Supercycle. I'm not sure what company manufactored them for Canadian Tire. Right now, the pedals won't clear the engine if mounted on. I'll try reversing the mounts first and go from there. Thanks.
     
  10. Nashville Kat

    Nashville Kat Active Member

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    Probably not much help, but a 50cc motor might fit between, just a smidge smaller.

    You don't have the motor with the built in CDI do you? That's a smidge wider.

    If your bottom bracket looked more standard 3 piece crank I'd suggest searching cotter pin spindles on e-bay because they come in different lengths too, but I'm not sure that;s good advice for your bike, because it looks as if the cups thread onto the spindle somehow like a one piece crank setup. You might be able to replace the crank with a wide one piece crank, but that's just a guess. IF you have any one piece steel astabula cranks around you could see it your bearing cups will screw down on that- and THEN get a wider one.
    The tread spacing might still be a problem even then.
     
    #10 Nashville Kat, May 28, 2015
    Last edited: May 28, 2015

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