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quickly removable seat pin / QRS modification DIY

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quickly removable seat pin / QRS modification DIY

Postby Blackstridaaustria on Wed Apr 06, 2011 4:26 pm

Hello Strida fans,

this modification is intended for people, who want to share their (ST-QRS-001 equipped) Strida temporarily with another person of greatly different body height.
A body height of 1,45 - 1,75m requires the lower position of the seat pin and a height of 1,75 - 1,93 m the higher position.

The changing of the seat pin to another (upper or lower) position requires usually the un- and remounting of the saddle, the carrier and the complete "quick" release seat molding. :roll: :?

A new designed seat pin (containing a magnet), together with a few simple mods on the seat molding solve the problem... :D
The material costs are below 1 €, most expensive part is the magnet (0,22 €/each).
Weight of magnet 0,32 g, magnetic force 350 g (~50 x weight of the seat pin), from here:
http://www.supermagnete.de/eng/S-03-06-N

The pins:

Image

Image


Required mod on the seat molding (wood drill, low rpm):

Image

Image


Required mod on the QR locking mount (metal drills in 1 mm steps, mid rpm):

Image


Function of the helping "tool" (plastic roll):

Image


The "tool" and the small parts:

Image


Design drawing, material: free cutting steel - every lathe operator will know what's that :wink:

Image


Strongly recommended: The use of anti-seizing compound and torque allen screw driver.

Image

http://www.neverseezproducts.com/bostik.htm
http://www.wera.de/


Function video (44 sec. 2,6Mb):

http://s769.photobucket.com/albums/xx331/Blackstridaaustria/QRS%20mod/?action=view&current=MOV02344_002-1.mp4

Image

More info about this topic to be found here:

viewtopic.php?f=2&t=2966#p4978
viewtopic.php?f=2&t=3024#p5129

Please note: There are no spare parts for the QRS system available.
Damaging one part means you have to buy a complete new QRS set!

More tricks gladly by request...
...better pics are here:

http://s769.photobucket.com/albums/xx331/Blackstridaaustria/Strida%20QRS%20quickly%20removable%20seat%20pin%201024/

W. r.
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Re: quickly removable seat pin / QRS modification DIY

Postby Amuro Lee on Wed Apr 06, 2011 5:48 pm

Wow! It's a great invention. 8)
http://en.wikipedia.org/wiki/Amuro_Ray

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Re: quickly removable seat pin / QRS modification DIY

Postby Tom__ on Thu Apr 07, 2011 11:42 am

Impressive.
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Re: quickly removable seat pin / QRS modification DIY

Postby fwd-bwd on Thu Apr 07, 2011 2:26 pm

Great solution! Thanks for sharing.
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Re: quickly removable seat pin / QRS modification DIY

Postby Guest on Thu Apr 07, 2011 2:29 pm

WoW that is an awesome piece of work - well done and thanks for Sharing. :D
(Shame on Ming dor making such a stupid a limited height seat adjustment system in the 1st place !!! :roll: )
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Re: quickly removable seat pin / QRS modification DIY

Postby Blackstridaaustria on Thu Apr 07, 2011 10:14 pm

Many thanks to all of you! :D

...new QRS raw material arrived yesterday from vanmoof...

...on the way modding another real QUICK release system...

...durability report(s) will follow...


Beware of helmets :twisted:
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[* book title; Werner Gruber, Austrian physicist, 2010]
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Re: quickly removable seat pin / QRS modification DIY

Postby Blackstridaaustria on Mon Aug 06, 2012 9:54 am

...durability report(s) will follow...


There is not that much to say - it works fine since over a year on both Stridas - mostly.

Sometimes, even equipped with the very strong magnet, it takes two or three attempts to pull the seat pin out.
(The hole in the seat molding must be aligned accurately to the seat pin.)
I've changed the pins maybe 50 times by now.

Sadly, it is not possible to convert a constructional fault into an ingenious concept...

Actually, I'm still thinking about a fully adjustable, foldable saddle mount solution, function like the fictive version shown below:

Image

Image

What do you think about that, might that be useful?
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[* book title; Werner Gruber, Austrian physicist, 2010]
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Re: quickly removable seat pin / QRS modification DIY

Postby Bietrume on Mon Aug 06, 2012 1:08 pm

Hi BSA,

That would be for sure an interesting feature: I always have my Strida in the trunk of my car lying against the rear seat backs, and I always struggle because it interferes with the luggage cover. So a lower folded Strida is a must for me!
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Re: quickly removable seat pin / QRS modification DIY

Postby Guest on Thu Dec 13, 2012 8:09 pm

Check out Mark Sanders solution - I guess Ming wanted to do their own thing. Maybe they had a million pins in stock :mrgreen:
https://picasaweb.google.com/1053980757 ... 7903858962
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Re: quickly removable seat pin / QRS modification DIY

Postby Blackstridaaustria on Thu Dec 13, 2012 9:32 pm

Hm, nice video...but is anybody able to explain the function of the non-painted groove in the tube? :?:
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Re: quickly removable seat pin / QRS modification DIY

Postby deepfraught on Tue Jan 01, 2013 4:40 am

Thanks for the post and info. Mine will likely stay on the top, but of all my bikes this would be one I'd be most likely to share, so making it easier to share given the chance will remove one excuse for being selfish with my bikes.

PS: What bull horn bar end grips are you using in those photos
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Re: quickly removable seat pin / QRS modification DIY

Postby Blackstridaaustria on Tue Jan 01, 2013 11:19 am

I'm glad that you like the post :D

deepfraught wrote:PS: What bull horn bar end grips are you using in those photos


Grips for bend stear kit

These are (older) versions of the Ergon GC2,
Image

the newer GP2 are looking slightly different:
Image

Ergon bike ergonomics
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