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What is it? 1980s Roadmaster? mtb with non-round top tube and downtube

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What is it? 1980s Roadmaster? mtb with non-round top tube and downtube

Old 07-04-21, 05:22 PM
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rickpaulos
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What is it? 1980s Roadmaster? mtb with non-round top tube and downtube

what is it? the top tube is tear drop shaped with the blunt end pointed up.

The downtube is flattened vertically behind the head tube and horizontally at the bb.
Threaded bb.
mono-seat stay.
The previous owner had it powder coated long ago and could not remember the brand or model.
no trace of the serial number. Obscured by the new paint.

It's similar to a Roadmaster Techno Trac I had last (broken and scrapped out).















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Old 07-05-21, 05:00 PM
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Originally Posted by rickpaulos View Post
what is it? the top tube is tear drop shaped with the blunt end pointed up.

The downtube is flattened vertically behind the head tube and horizontally at the bb.
Threaded bb.
mono-seat stay.
The previous owner had it powder coated long ago and could not remember the brand or model.
no trace of the serial number. Obscured by the new paint.

It's similar to a Roadmaster Techno Trac I had last (broken and scrapped out).

I've seen a Sears-branded bike like this for sale, the FS 6000 ESB, I think. Posted it in the Wacky thread recently.
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Old 07-05-21, 05:14 PM
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livedarklions
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Originally Posted by rickpaulos View Post
what is it? the top tube is tear drop shaped with the blunt end pointed up.

The downtube is flattened vertically behind the head tube and horizontally at the bb.


It's similar to a Roadmaster Techno Trac I had last (broken and scrapped out).



Outside of the weird down and top tube shapes, I'm not seeing any relationship between those two frames. That Technotrac has a weird curve in the seat tube and an extra tube linking the seat tube and the down tube. It also has a completely different angle on the chain stays. The red frame seems rather standard issue in comparison. Did anyone else use those non-round tubes?
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Old 07-06-21, 08:50 AM
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The top bike is a design often called an E Stay (elevated chain stay) and was popular for a time around the 1980's-1990's. An interesting design that allowed the chain to be completely removed but eventually they phased out as there was a problem with frame cracking. I have one made by Nishiki.

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Old 07-06-21, 09:50 AM
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I wouldn't doubt that Sears would have their name on a Roadmaster.
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Old 07-11-21, 06:37 PM
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rickpaulos
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the elevated chainstay was to help eliminate chain suck on mountain bikes. But so many frames broke due to poor construction. just welding or brazing the stays to the back of seat tube was the main problem. using longer stays that overlap the downtube was a stronger design.

I'm still looking for an elevated stay frameset with horizontal dropouts for a build project but have yet to find one.

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Old 07-11-21, 10:56 PM
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Rickpaulos is right. The elevated chainstay was to eliminate chain suck. Don't know the brand.
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