Trouble finding 51mm bottom bracket?

Discussion in 'Board Trackers and Vintage Motorized Bicycles' started by davla, Dec 5, 2018.

  1. davla

    davla New Member

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    I'm using a Chinese aluminium Schwinn copy frame for my project but can't find a press fit bottom bracket for it. Can anyone point me in the right direction pls? I'm in the UK btw

    IMG_2439 2.JPG IMG_2439 2.JPG IMG_8651.JPG IMG_3095.JPG
     
    #1 davla, Dec 5, 2018
    Last edited: Dec 5, 2018
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  2. indian22

    indian22 Well-Known Member

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    I used a 2" "cruiser" bracket for that frame, common here in the states, worked a charm & quite inexpensive.

    Rick C.
     
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  3. Venice Motor Bikes

    Venice Motor Bikes Custom Builder / Dealer/Los Angeles

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    Yes... It's a 'American style' bottom bracket. (very common throughout the whole world actually)

    You can find them on eBay.
     
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  4. davla

    davla New Member

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    Cheers guys....I discovered it's basically the same as an old style BMX 1 piece crank set up, so I should be able to find a set on ebay like you say.
     
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  5. Ludwig II

    Ludwig II Well-Known Member

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    Try my mate Doug Pinkerton in Redditch. Vintage, rare and specialist bike repair and construction. He'll even do you a Dursley Pedersen if you ask him nicely. If he can't get you one, he knows a man who will. Phone 0777 842 9313 after tomorrow evening, he's on a small break with his wife right now.

    Where are you anyway? I'm in Brum.
     
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  6. davla

    davla New Member

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    Hi Ludwig, I'm in Ashford, Middlesex/Surrey/West London. I think I've got one of these cranks on another bike that I don't use, if not I'll give Doug a shout

    UPDATE - All sorted, it took all of about 10 minutes to remove crank & bearing assembly from one frame and fit to the other
     
    #6 davla, Dec 5, 2018
    Last edited: Dec 6, 2018
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  7. Tom from Rubicon

    Tom from Rubicon Active Member

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    Way to go davia, looking forward to the progress of your build.
    Tom
     
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  8. Ludwig II

    Ludwig II Well-Known Member

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    What engine is going into this?
     
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  9. davla

    davla New Member

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    I'm just using an 80cc/66cc Chinese engine. I picked up the whole engine kit for 88 quid from ebay and have replaced all of the cheese screws with stainless Allen bolts. I'll also whip off the head and make sure there are no air leaks. I'm using a 40t Sportsman rear sprocket and will probably stick on a better carb and modify the exhaust to run straight through to the rear wheel. I'm waiting on the wheels to finish the dry build and will then get the frame powder coated black and will build up properly. It's been very straight forward so far so fingers crossed.

    IMG_5373.JPG IMG_2439 2.JPG IMG_8651.JPG
     
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  10. Ludwig II

    Ludwig II Well-Known Member

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    Where will you ride it?
     
  11. davla

    davla New Member

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    That’s a good question, I have no idea! It would be nice to find a disused running track or small airport runway but I need to have a look around. I might try and get ‘single vehicle approval’ from the DVLA but don’t know how realistic it is. Where do you ride yours?
     
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  12. Ludwig II

    Ludwig II Well-Known Member

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    It's part way through construction. I haven't been able to get work done for various reasons for most of this year. I am short cutting legality by using the fact it's based on an old Raleigh with exempt paperwork to have it on the road.

    The SVA offers 2 levels of moped, if you go for 50cc, 1kw Low Power Moped status, the rules really do fit a motorised bike. 1 headlight, 1 tail light, no indicators or brake light required. Tyres only have to be good, sound and have decent tread depth, no speed rating needed, about 30(K)ph max speed. All controls operable from handlebars. Basic common sense stuff. If you go for the ordinary level, you have to have all the bells and whistles a commercially sold moped needs.
     
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  13. davla

    davla New Member

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    Oh ok, thanks for that. I’ll look into it a bit further and might stick a 50cc engine in it in that case as it’ll give me more opportunity to ride it
     
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