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S.Brothers

10 lb bike circa 1981 Powerlite in BMX plus

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From the February 1981 BMX Plus... here's a 10lb bike with specs

10_lb_bike_Feb_81_BMXplus.png

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Cool little bike. I kind of like the sweep on the bars lol

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I absolutely love these type of articles. Steve, Is there any other pages relating to this particular bike or is it a solo spread?

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Found this in the Jan 81 BMX Plus mag at oldschoolmags.com.           You may have better luck at a road bike forum for that headset.

D742122D-B8A4-4085-93BA-209617FC91BE.jpeg

CA96DA2E-FF72-4DC9-9969-B16B926E344A.jpeg

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Sweet! Thank you for the contribution Dav, it will be very useful.

After taking a quick inventory of the components I have on hand, I might be able to build a very similar mini without my wallet taking too much of a hit.

 

 

Edited by dubplatestyle
accidently posted before completing
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So it looks like this is definitely happening.

 

Components pulled so far:

DSC01526.JPG

Demco Futura X Pedals

DSC01527.JPG

Nyflor Headset (complete w/ composite bearings)

DSC01528.JPG

Modified Campy Cranks (Stoker tandem crank modified for a child)

DSC01529.JPG

24H Phil Hubs w/ drilled out Fiamme Rims

IMG_8916.JPG

IMG_8917.JPG

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I have a set of cranks set aside for that same modification if I can’t find some short ones before the time comes for my mini build. I was going to have them tapped out for 1/2” pedals though to leave a little more metal on the crank.

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Seeing the mention of modified cranks...  

Here’s my set of custom shortened Campagnolo’s (tapped for 1/2” pedals) that Ralph’s Bicycles did bitd.  
9B671373-2B75-4C4C-BBC2-1815080847FE.jpeg

 

dope start Dub...break the 10lbs mark!!!!

 

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3 hours ago, dav451 said:

I have a set of cranks set aside for that same modification if I can’t find some short ones before the time comes for my mini build. I was going to have them tapped out for 1/2” pedals though to leave a little more metal on the crank.

The craftsman who modified these must have had the same concerns about structural integrity, because these are tapped for 1/2" pedals as well.

Here's a 'pic' of the whole set-up:

IMG_8436.JPG

IMG_8437.JPG

IMG_8441.JPG

I always found the Phil branded adjustable bottom bracket mount very intriguing.

IMG_8439.JPG

 

Now back to dilemma number 1, what are my chances of finding 1/2" pedal spindles for a set of Demco's?

 

Patrick, thank you for the words of encouragement. Getting under 10lbs. and staying period correct is an arduous task.

 

Billy Week's JMC by Norm's Bikes was close at 10.5 lbs.

Bicycles & Dirt (Jan. '84) Norm's JMC.JPG

norms_weeks.jpg

 

Did you ever get around to weighing the Hustler?

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Sick parts (you might need to start a thread on those alone).  Those spiders, bb...  :rawks:
 

i can’t remember if I weighed the Hustler or not.  I’ll check as soon as I can. I’m pretty sure it’s nowhere near 10lbs though. 

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Cool parts for sure.

Can you provide further information on the Phil adjustable bottom bracket? And perhaps show one installed? As I have not seen that before.

 

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16 hours ago, Curt said:

Cool parts for sure.

Can you provide further information on the Phil adjustable bottom bracket? And perhaps show one installed? As I have not seen that before.

 

 

Here's a quick diagram on how this particular tandem 'stoker' conversion operated:

Stoker Conversion.pdf

*Set the adjustable bottom bracket mount and shortened cranks to the desired height needed on the (stoker position) seat tube, while the (2) separate campy spiders replace the original set of cranks on the frame bottom bracket, reroute drive train around added chain rings.*

Edited by dubplatestyle

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Very interesting and not what I was thinking. I had though the Phil unit mounted to the lower seat mast or fame tube as a way to bypass the as installed BB AKA as the Phil unit would be the new BB location. Thanks for sending.

Also if that is your drawing good work!

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After a great deal of careful consideration, I narrowed it down to the following two frame & fork options.

 

A) Harbor-Lite 'Ultra-Lite' Mini

DSC01552.JPG

 

B) Blazer Mini Frame w/ Harbor-Lite 'Sew-Up' Fork

DSC01553.JPG

 

 

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I was also fortunate to identify and source a 'BF' headset used in the original article.

 

JPR Alloy Headset (Made In France) 68 grams:

DSC01547.JPG

 

Patented by B-F (Belleri Francois)

 

DSC01548.JPG

 

DSC01549.JPGDSC01550.JPG

 

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On 2/13/2020 at 8:35 PM, dav451 said:

Which combo is lighter?

The alloy bottom bracket cups are currently seized on the Harbor-Lite, so I can't accurately give an 'apples-to-apples' comparison at the moment.

Blazer Mini Frame (Chrome):

3 lbs. 0.4 oz.

Harbor-Lite 'Sew-Up' Fork:

1 lbs. 0.4 oz. (465 grams)

Harbor-Lite 'Ultra-Lite' Mini Frame (w/ O.M.A.S. 'Big Sliding' Bottom Bracket / Steel Spindle):

3 lbs. 11 oz.

'Ultra-Lite' Mini Fork:

1 lbs. 0.9 oz. (480 grams)

 

 

 

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Thought I would see how much of difference there is between a painted frame vs chrome plated.

N.O.S. Blazer Mini Frame (Painted):

2 lbs. 14.9 oz. (1332 grams)

DSC01564.JPG

Metallic Brown

DSC01563.JPG

 

While I was at it, thought I would weigh a JMC for good measure.

 

DSC01566.JPG

N.O.S. '85 JMC Mini Frame (Painted):

2 lbs. 8 oz. (1133 grams)

DSC01565.JPG

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Just now, dubplatestyle said:

Thought I would see how much of difference there is between a painted frame vs chrome plated.

N.O.S. Blazer Mini Frame (Painted):

2 lbs. 14.9 oz. (1332 grams)

DSC01564.JPG

Metallic Brown

DSC01563.JPG

 

While I was at it, thought I would weigh a JMC for good measure.

 

DSC01566.JPG

N.O.S. '85 JMC Mini Frame (Painted):

2 lbs. 8 oz. (1133 grams)

DSC01565.JPG

JMC for the win.

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The 'Mini Shootout!!' continues.......

 

'86 JU 'Jeff Utterback' Racing Mini Frame w/ pressed in bottom bracket bearings installed:

2 lbs. 14 oz. (1319 grams)

JU Racing Mini Fork:

1 lbs. 1 oz. (507 grams)

DSC01568.JPG

 

N.O.S. Bandito Racing Mini Frame:

3 lbs. (1360 grams)

DSC01569.JPG

 

 

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WOW! That JU racing mini frame is pretty cool. The rest are just plain cool. LOL

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I had a few '83 JMC 'round tube' mini's over the years, and the frames consistently weighed approx. 2 lbs 7.9 oz. Except those w/ an integrated seat post clamp. Which I believe became a standard feature by the end of '83.

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