| mclien | Posted: 8 Dec 2021, 09:59 AM |
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 Member Posts: 1 Joined: 8-December 21 |
aluminum in general: Biggest flaw of it: It breaks without warning (other than steel, which will bend first and might give you some seconds head-time before failure. You can pant the stem in bright yellow or alike and check regularly to spot cracks in advance. Plus welding forged aluminum will take out a lot of the materials strength and might invoke cracks. So the warnings you give up front are very correct and important. Design wise I would go for the revolo design, because I rate it the most forgiving in case of failure. You might still be able to steer even if the parts get loose a bit. It has the twisting axle put in the right direction (the forces you put into the connection while riding don't depend on the tightness of the clamping, because they are perpendicular to it). If you rebuild that from steel and use a square instead of a round connection for the twisting part you would additionally have the position fix without hassle. Or, you just make the handlebar as small as the pedals. Which will have to go right through the middle of the searing axle (not before it like usual), but will require a longer bicycle frame for ergonomics. I have that one seen working at a messenger bike in Berlin years ago. just my 2cents (survived cycling daily for some decades) ------------- |
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| mit | Posted: 9 Dec 2021, 04:46 PM |
 yeah whatever Admin Posts: 657 Joined: 4-May 16 |
Hi, thanks for the comments. I should really post an update on the QR stem. The bike is still going fine, and I'm still riding it! Through the pandemic I wasn't riding all that much, but it still got a fair bit of usage. I've probably clamped/unclamped/rotated it a few hundred times now. I never did add the detent to hold it level, or stop it slipping while clamped, but the funny thing is that it hasn't really bothered me. Even if you don't clamp it fully, and it slips while you're riding, it's not nearly as jarring an experience as I thought it would be. I might post a proper update if I get a spare moment. ------------- |
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| SANDMAN | Posted: 16 Jan 2026, 06:32 AM |
 Member Posts: 2 Joined: 16-January 26 |
Hi. Are you selling production models of the qr stem? I see one on a site for sale, but it's suspect, because the pics are from your products page. It is giving in the description "mitxela.com" but is showing your design, from your initial prototype pic, as well as the Zenstem for sale. It's this url: (removed) Last edit by mit at 16 Jan 2026, 08:44 AM ------------- |
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| mit | Posted: 16 Jan 2026, 08:44 AM |
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yeah whatever Admin Posts: 657 Joined: 4-May 16 |
I would suggest that site is just a scam with stolen images and not much thought put into it. Amusing that they would take the handlebar picture with my red EVA foam, I'm sure that must be driving away some of their potential victims... I might edit out that link so the crawlers don't think it's officially associated with me. ------------- |
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| SANDMAN | Posted: 16 Jan 2026, 07:12 PM |
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Member Posts: 2 Joined: 16-January 26 |
I figured as much. Thank you. I really wish there was a production model out there like this. I want one or some sort of quick release on this type of stem that lets go of the handlebars completely. ------------- |
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