Australian Tube Products Stem Cap Project

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QuangVuong
Posts: 1778
Joined: Sun Feb 24, 2013 5:04 pm
Location: Villawood, Sydney
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Re: Australian Tube Products Stem Cap Project

Postby QuangVuong » Sat May 21, 2016 3:42 pm

According to old steel bikes, the ATP bars are 19mm internal diameter with a 21.75mm outer diameter. Other bars from the era had an I.D. of 19.5mm, but the same O.D. of ~21.75mm. So to make these plugs suit all types of bars, I've made the plugs slightly tapered, from 19mm to 19.6mm. It should end up a snug fit in the larger diameter bars, but still be able to be pressed tightly into the smaller diameter ATP bars. But happy to get more measurements of other bars from the era.
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The ATP stem with a 3D printed stem cap and bar plug in unknown bars.
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Don't mind the slight discoloration in the red cap. That was due to a dirty buffing wheel.
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Shape is very accurate.
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For anyone interested, each pair of bar plugs in red will be $7.50, or $10 for custom colours. Stem caps can still be printed too in red for $7.50, or $10 for custom colours.

Also, I have moved the files onto Thingiverse. The 3D model can be viewed direct from the site if you click on Thingiview of the last image/file. The STL files as well as the Solidworks part file can be downloaded for printing and editing.
ATP Stem Cap
ATP Bar Plugs
VillaVelo, by the Vuong brothers

Blog: https://villaveloframes.wordpress.com/
FB & IG: @villaveloframes

ian theobald
Posts: 12
Joined: Fri Nov 25, 2016 3:39 pm

Re: Australian Tube Products Stem Cap Project

Postby ian theobald » Tue Dec 27, 2016 11:26 pm

I have a very old bike which would like to restore and fit original components back on it.
It originaly had this type of handle bar and stem but were replaced with alloy back in the early 80s
Would any one have a set complete or could help out with the rest of bike components
My frame is called a Century and has intricate clover leaf lugs and arrow carvings. Having one of these stems suggests was made in the 50s
it took a while to identify what type of stem was fitted so if any body has some would gladly purchase.thanks ian

User avatar
QuangVuong
Posts: 1778
Joined: Sun Feb 24, 2013 5:04 pm
Location: Villawood, Sydney
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Re: Australian Tube Products Stem Cap Project

Postby QuangVuong » Wed May 02, 2018 8:39 pm

Looks like the 3D print stem cap has made it big. Spotted on a stem made by Geoff Duke which was on display at the Handmade Bicycle Show Australia last weekend.
Image
VillaVelo, by the Vuong brothers

Blog: https://villaveloframes.wordpress.com/
FB & IG: @villaveloframes

old steel Bikes
Posts: 288
Joined: Fri Dec 14, 2012 6:09 pm

Re: Australian Tube Products Stem Cap Project

Postby old steel Bikes » Sat May 05, 2018 5:43 am

Quang not sure if anyone had noticed but the bar end plugs in the Hetchins are the ATP ones you produced in gold for me.

ImageIMG_4925 by Danny Brooks, on Flickr

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