Anybody ever see anything like this!?
05-21-21, 02:35 PM
#3
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Hey man rubber isn’t cheap!!! Oh wait... 
Looks like post-war spring wheel. Have to say I’ve never seen a photo of one with a tyre mounted.
Looks like post-war spring wheel. Have to say I’ve never seen a photo of one with a tyre mounted.
05-21-21, 02:37 PM
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just imagine the energy loss from the spring flexure
gives a whole new meaning to the phrase "spinning one's wheels"
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just imagine the energy loss from the spring flexure
gives a whole new meaning to the phrase "spinning one's wheels"
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05-21-21, 02:37 PM
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05-21-21, 02:50 PM
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I'd expect some out-of-the-saddle brake rub.
Not much room for the pump head. Probably need an aero disc wheel chuck for that.
Not much room for the pump head. Probably need an aero disc wheel chuck for that.
05-21-21, 02:56 PM
#7
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Even though this isn't a great solution for anything, I'm still a fan of the mentally handicapped occupying engineering positions.
05-21-21, 03:28 PM
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The best of both worlds: 650B and 27"! 
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05-21-21, 06:35 PM
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The newer version above must have been an engineering student's class project. It must have created more problems than it solved, if any. What, exactly, was the objective?
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05-21-21, 08:39 PM
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Apart from adding a couple of pounds to rotational weight, I can imagine cornering at any elevated speed would've felt like cornering on a flat tire.
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05-22-21, 12:17 PM
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The brakes won't be worth a hoot even in the saddle. The compression and expansion of the springs will mean the outer rim's position will be constantly moving up and down relative to the brake pad position. For this to work effectively with caliper brakes you'd need a brake with a super long reach, working on the fixed position the inner rim
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05-22-21, 08:41 PM
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You guys are missing the obvious. The person who built the wheels had different sized rims, but only one length of spoke and one tire size. Looking around, there was a box of springs hidden on a top shelf...
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05-22-21, 09:54 PM
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05-22-21, 10:04 PM
#19
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Notmantel
WW1 German??? bike called a Notmantel...
No pump needed!
verktyg
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05-22-21, 11:24 PM
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If they'd laced it up right, they could have lined up the two valve holes, and then used a loooong stem tube (or some sort of adapter).
05-22-21, 11:45 PM
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If you scroll through the article Choke linked to in Post # 5, all becomes clear - The Germans did this in WWI because of the shortage, expense and difficulty in the repair of rubber at the time. Knowing that, it seems pretty ingenious to me.
These were military bikes; the intent was to get soldiers from here to there relatively quickly (compared to walking). Comfort and handling characteristics were likely not at the top of the list of design priorities.
These were military bikes; the intent was to get soldiers from here to there relatively quickly (compared to walking). Comfort and handling characteristics were likely not at the top of the list of design priorities.
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05-23-21, 01:50 AM
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The dynamic movement would likely tear up a rubber stem (are those rubber over a hard material?
And for a steel stem, it would still need a lot of flex somewhere.
05-23-21, 07:58 AM
#23
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They're still at it today in one form or another.
This is a MoBike bike share bike from 2018. You can get these "tires" and bikes with these tires on AliExpress.
-Kurt
This is a MoBike bike share bike from 2018. You can get these "tires" and bikes with these tires on AliExpress.
-Kurt
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05-23-21, 08:09 AM
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Someone shared this airless tire design with me earlier.
https://mashable.com/video/new-way-o...never-go-flat/
https://mashable.com/video/new-way-o...never-go-flat/
05-23-21, 03:54 PM
#25
Ageing Warrior
All of these examples, apart from, possibly, the latter, must have made cornering and braking 'interesting' to say the least!
The old motorcycle sprung hubs on anything heavier than a BSA Bantam were (are) a pain to set up and subject to very uneven wear and need frequent adjustment. Some makers used them long after the innovation of the swinging fork (often referred to as 'swing arm').
The old motorcycle sprung hubs on anything heavier than a BSA Bantam were (are) a pain to set up and subject to very uneven wear and need frequent adjustment. Some makers used them long after the innovation of the swinging fork (often referred to as 'swing arm').